Company Quick10K Filing
United States Steel
Price11.30 EPS0
Shares173 P/E51
MCap1,949 P/FCF5
Net Debt2,004 EBIT92
TEV3,953 TEV/EBIT43
TTM 2019-09-30, in MM, except price, ratios
10-K 2020-12-31 Filed 2021-02-12
10-Q 2020-09-30 Filed 2020-10-30
10-Q 2020-06-30 Filed 2020-07-31
10-Q 2020-03-31 Filed 2020-05-01
10-K 2019-12-31 Filed 2020-02-14
10-Q 2019-09-30 Filed 2019-11-01
10-Q 2019-06-30 Filed 2019-08-02
10-Q 2019-03-31 Filed 2019-05-03
10-K 2018-12-31 Filed 2019-02-15
10-Q 2018-09-30 Filed 2018-11-02
10-Q 2018-06-30 Filed 2018-08-02
10-Q 2018-03-31 Filed 2018-04-27
10-K 2017-12-31 Filed 2018-02-21
10-Q 2017-09-30 Filed 2017-11-01
10-Q 2017-06-30 Filed 2017-07-26
10-Q 2017-03-31 Filed 2017-04-26
10-K 2016-12-31 Filed 2017-02-28
10-Q 2016-09-30 Filed 2016-11-02
10-Q 2016-06-30 Filed 2016-07-27
10-Q 2016-03-31 Filed 2016-04-27
10-K 2015-12-31 Filed 2016-02-29
10-Q 2015-09-30 Filed 2015-11-04
10-Q 2015-06-30 Filed 2015-07-29
10-Q 2015-03-31 Filed 2015-04-29
10-K 2014-12-31 Filed 2015-02-24
10-Q 2014-09-30 Filed 2014-10-29
10-Q 2014-06-30 Filed 2014-07-30
10-Q 2014-03-31 Filed 2014-04-30
10-K 2013-12-31 Filed 2014-02-25
10-Q 2013-09-30 Filed 2013-10-29
10-Q 2013-06-30 Filed 2013-07-30
10-Q 2013-03-31 Filed 2013-04-30
10-K 2012-12-31 Filed 2013-02-15
10-Q 2012-09-30 Filed 2012-10-30
10-Q 2012-06-30 Filed 2012-07-31
10-Q 2012-03-31 Filed 2012-04-25
10-Q 2011-09-30 Filed 2011-10-25
10-Q 2011-06-30 Filed 2011-07-26
10-Q 2011-03-31 Filed 2011-04-26
10-K 2010-12-31 Filed 2011-02-22
10-Q 2010-09-30 Filed 2010-10-26
10-Q 2010-06-30 Filed 2010-07-27
10-Q 2010-03-31 Filed 2010-04-27
10-K 2009-12-31 Filed 2010-02-24
8-K 2020-11-24
8-K 2020-10-30
8-K 2020-10-29
8-K 2020-10-29
8-K 2020-09-30
8-K 2020-09-21
8-K 2020-09-18
8-K 2020-07-31
8-K 2020-07-30
8-K 2020-07-30
8-K 2020-07-26
8-K 2020-06-17
8-K 2020-06-17
8-K 2020-06-17
8-K 2020-05-29
8-K 2020-05-21
8-K 2020-05-20
8-K 2020-05-01
8-K 2020-04-30
8-K 2020-04-30
8-K 2020-04-30
8-K 2020-04-28
8-K 2020-03-23
8-K 2020-03-20
8-K 2020-03-10
8-K 2020-01-31
8-K 2020-01-30
8-K 2020-01-30
8-K 2019-12-23
8-K 2019-12-19
8-K 2019-12-10
8-K 2019-11-01
8-K 2019-10-31
8-K 2019-10-31
8-K 2019-10-25
8-K 2019-10-17
8-K 2019-10-16
8-K 2019-10-15
8-K 2019-10-10
8-K 2019-10-07
8-K 2019-09-30
8-K 2019-09-18
8-K 2019-08-02
8-K 2019-08-01
8-K 2019-08-01
8-K 2019-07-28
8-K 2019-06-18
8-K 2019-05-03
8-K 2019-05-02
8-K 2019-05-02
8-K 2019-05-02
8-K 2019-04-30
8-K 2019-03-20
8-K 2019-01-30
8-K 2019-01-30
8-K 2018-12-21
8-K 2018-11-01
8-K 2018-11-01
8-K 2018-11-01
8-K 2018-10-30
8-K 2018-09-26
8-K 2018-08-31
8-K 2018-08-01
8-K 2018-08-01
8-K 2018-04-26
8-K 2018-04-26
8-K 2018-04-25
8-K 2018-03-19
8-K 2018-03-13
8-K 2018-03-13
8-K 2018-03-12
8-K 2018-03-05
8-K 2018-02-26
8-K 2018-01-31
8-K 2018-01-31

X 10K Annual Report

Part I
Item 1. Business
Item 1A. Risk Factors
Item 1B. Unresolved Staff Comments
Item 2. Properties
Item 3. Legal Proceedings
Item 4. Mine Safety Disclosure
Part II
Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Item 6. Selected Financial Data
Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations
Item 7A. Quantitative and Qualitative Disclosures About Market Risk
Item 8. Consolidated Financial Statements and Supplementary Data
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
Item 9A. Controls and Procedures
Item 9B. Other Information
Part III
Item 10. Directors, Executive Officers and Corporate Governance
Item 11. Executive Compensation
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Item 13. Certain Relationships and Related Transactions, and Director Independence
Item 14. Principal Accountant Fees and Services
Part IV
Item 15. Exhibits and Financial Statement Schedule
Item 16. Form 10 - K Summary
EX-10.1 ex101d201231.htm
EX-10.2 ex102d201231.htm
EX-10.3 ex103d201231.htm
EX-10.4 ex104d201231.htm
EX-21 ex21d201231.htm
EX-23 ex23d201231.htm
EX-24 ex24d201231.htm
EX-31.1 ex31p1d201231.htm
EX-31.2 ex31p2d201231.htm
EX-32.1 ex32p1d201231.htm
EX-32.2 ex32p2d201231.htm
EX-95 ex95d201231.htm

United States Steel Earnings 2020-12-31

Balance SheetIncome StatementCash Flow
2016128402012201420172020
Assets, Equity
4.62.91.2-0.6-2.3-4.02012201420172020
Rev, G Profit, Net Income
0.80.60.30.1-0.2-0.42012201420172020
Ops, Inv, Fin

x-20201231
false2020FY000116330212/31P3YP3YP3YP3YP3YP3YP3YP3YP4Y756775P2Y00011633022020-01-012020-12-310001163302exch:XNYS2020-01-012020-12-310001163302exch:XCHI2020-01-012020-12-31iso4217:USD00011633022020-06-30xbrli:shares00011633022021-02-0800011633022019-01-012019-12-3100011633022018-01-012018-12-31iso4217:USDxbrli:shares00011633022020-12-3100011633022019-12-3100011633022018-12-3100011633022017-12-310001163302us-gaap:CommonStockMember2019-12-310001163302us-gaap:CommonStockMember2018-12-310001163302us-gaap:CommonStockMember2017-12-310001163302us-gaap:CommonStockMember2020-01-012020-12-310001163302us-gaap:CommonStockMember2019-01-012019-12-310001163302us-gaap:CommonStockMember2018-01-012018-12-310001163302us-gaap:CommonStockMember2020-12-310001163302us-gaap:TreasuryStockMember2019-12-310001163302us-gaap:TreasuryStockMember2018-12-310001163302us-gaap:TreasuryStockMember2017-12-310001163302us-gaap:TreasuryStockMember2020-01-012020-12-310001163302us-gaap:TreasuryStockMember2019-01-012019-12-310001163302us-gaap:TreasuryStockMember2018-01-012018-12-310001163302us-gaap:TreasuryStockMember2020-12-310001163302us-gaap:AdditionalPaidInCapitalMember2019-12-310001163302us-gaap:AdditionalPaidInCapitalMember2018-12-310001163302us-gaap:AdditionalPaidInCapitalMember2017-12-310001163302us-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310001163302us-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310001163302us-gaap:AdditionalPaidInCapitalMember2018-01-012018-12-310001163302us-gaap:AdditionalPaidInCapitalMember2020-12-310001163302us-gaap:RetainedEarningsMember2019-12-310001163302us-gaap:RetainedEarningsMember2018-12-310001163302us-gaap:RetainedEarningsMember2017-12-310001163302us-gaap:RetainedEarningsMember2020-01-012020-12-310001163302us-gaap:RetainedEarningsMember2019-01-012019-12-310001163302us-gaap:RetainedEarningsMember2018-01-012018-12-310001163302us-gaap:RetainedEarningsMember2020-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2017-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-01-012019-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-01-012018-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310001163302us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310001163302us-gaap:AccumulatedTranslationAdjustmentMember2018-12-310001163302us-gaap:AccumulatedTranslationAdjustmentMember2017-12-310001163302us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-12-310001163302us-gaap:AccumulatedTranslationAdjustmentMember2019-01-012019-12-310001163302us-gaap:AccumulatedTranslationAdjustmentMember2018-01-012018-12-310001163302us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310001163302x:DerivativeFinancialInstrumentsMember2019-12-310001163302x:DerivativeFinancialInstrumentsMember2018-12-310001163302x:DerivativeFinancialInstrumentsMember2017-12-310001163302x:DerivativeFinancialInstrumentsMember2020-01-012020-12-310001163302x:DerivativeFinancialInstrumentsMember2019-01-012019-12-310001163302x:DerivativeFinancialInstrumentsMember2018-01-012018-12-310001163302x:DerivativeFinancialInstrumentsMember2020-12-310001163302us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310001163302us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001163302us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310001163302us-gaap:ParentMember2020-12-310001163302us-gaap:ParentMember2019-12-310001163302us-gaap:ParentMember2018-12-310001163302us-gaap:NoncontrollingInterestMember2019-12-310001163302us-gaap:NoncontrollingInterestMember2018-12-310001163302us-gaap:NoncontrollingInterestMember2017-12-310001163302us-gaap:NoncontrollingInterestMember2020-01-012020-12-310001163302us-gaap:NoncontrollingInterestMember2019-01-012019-12-310001163302us-gaap:NoncontrollingInterestMember2018-01-012018-12-310001163302us-gaap:NoncontrollingInterestMember2020-12-31xbrli:pure0001163302x:BigRiverSteelMember2019-10-310001163302x:WeldedTubularAssetGroupMember2020-01-012020-12-310001163302x:ThirdPartyAdministratorsSupplyChainFinancingAgreementMember2020-10-012020-10-310001163302x:ThirdPartyAdministratorsSupplyChainFinancingAgreementMemberx:ExportImportBankOfTheUnitedStatesMember2020-10-012020-10-310001163302x:ThirdPartyAdministratorsSupplyChainFinancingAgreementMemberx:ExportImportBankOfTheUnitedStatesMember2020-10-31x:pool0001163302x:U.S.SteelSegmentMember2019-12-310001163302x:UsSteelEuropeMember2019-12-310001163302x:U.S.SteelSegmentMember2020-01-012020-12-310001163302x:UsSteelEuropeMember2020-01-012020-12-310001163302x:U.S.SteelSegmentMember2020-12-310001163302x:UsSteelEuropeMember2020-12-31x:Segment0001163302x:FlatRolledProductsMember2020-01-012020-12-310001163302us-gaap:IntersegmentEliminationMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302us-gaap:OperatingSegmentsMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberus-gaap:IntersegmentEliminationMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310001163302x:TubularProductsMember2020-01-012020-12-310001163302us-gaap:IntersegmentEliminationMemberx:TubularProductsMember2020-01-012020-12-310001163302us-gaap:OperatingSegmentsMemberx:TubularProductsMember2020-01-012020-12-310001163302x:TotalReportableSegmentsMember2020-01-012020-12-310001163302x:TotalReportableSegmentsMemberus-gaap:IntersegmentEliminationMember2020-01-012020-12-310001163302us-gaap:OperatingSegmentsMemberx:TotalReportableSegmentsMember2020-01-012020-12-310001163302us-gaap:AllOtherSegmentsMember2020-01-012020-12-310001163302us-gaap:AllOtherSegmentsMemberus-gaap:IntersegmentEliminationMember2020-01-012020-12-310001163302us-gaap:OperatingSegmentsMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310001163302us-gaap:IntersegmentEliminationMember2020-01-012020-12-310001163302us-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:FlatRolledProductsMember2019-01-012019-12-310001163302us-gaap:IntersegmentEliminationMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302us-gaap:OperatingSegmentsMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302x:UsSteelEuropeMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberus-gaap:IntersegmentEliminationMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310001163302x:TubularProductsMember2019-01-012019-12-310001163302us-gaap:IntersegmentEliminationMemberx:TubularProductsMember2019-01-012019-12-310001163302us-gaap:OperatingSegmentsMemberx:TubularProductsMember2019-01-012019-12-310001163302x:TotalReportableSegmentsMember2019-01-012019-12-310001163302x:TotalReportableSegmentsMemberus-gaap:IntersegmentEliminationMember2019-01-012019-12-310001163302us-gaap:OperatingSegmentsMemberx:TotalReportableSegmentsMember2019-01-012019-12-310001163302us-gaap:AllOtherSegmentsMember2019-01-012019-12-310001163302us-gaap:AllOtherSegmentsMemberus-gaap:IntersegmentEliminationMember2019-01-012019-12-310001163302us-gaap:OperatingSegmentsMemberus-gaap:AllOtherSegmentsMember2019-01-012019-12-310001163302us-gaap:IntersegmentEliminationMember2019-01-012019-12-310001163302us-gaap:OperatingSegmentsMember2019-01-012019-12-310001163302us-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:FlatRolledProductsMember2018-01-012018-12-310001163302us-gaap:IntersegmentEliminationMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302us-gaap:OperatingSegmentsMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302x:UsSteelEuropeMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberus-gaap:IntersegmentEliminationMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberus-gaap:OperatingSegmentsMember2018-01-012018-12-310001163302x:TubularProductsMember2018-01-012018-12-310001163302us-gaap:IntersegmentEliminationMemberx:TubularProductsMember2018-01-012018-12-310001163302us-gaap:OperatingSegmentsMemberx:TubularProductsMember2018-01-012018-12-310001163302x:TotalReportableSegmentsMember2018-01-012018-12-310001163302x:TotalReportableSegmentsMemberus-gaap:IntersegmentEliminationMember2018-01-012018-12-310001163302us-gaap:OperatingSegmentsMemberx:TotalReportableSegmentsMember2018-01-012018-12-310001163302us-gaap:AllOtherSegmentsMember2018-01-012018-12-310001163302us-gaap:AllOtherSegmentsMemberus-gaap:IntersegmentEliminationMember2018-01-012018-12-310001163302us-gaap:OperatingSegmentsMemberus-gaap:AllOtherSegmentsMember2018-01-012018-12-310001163302us-gaap:IntersegmentEliminationMember2018-01-012018-12-310001163302us-gaap:OperatingSegmentsMember2018-01-012018-12-310001163302us-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302x:FlatRolledProductsMember2020-12-310001163302x:FlatRolledProductsMember2019-12-310001163302x:TubularProductsMember2020-12-310001163302x:TubularProductsMember2019-12-310001163302x:TotalReportableSegmentsMember2020-12-310001163302x:TotalReportableSegmentsMember2019-12-310001163302us-gaap:AllOtherSegmentsMember2020-12-310001163302us-gaap:AllOtherSegmentsMember2019-12-310001163302us-gaap:MaterialReconcilingItemsMember2020-12-310001163302us-gaap:MaterialReconcilingItemsMember2019-12-310001163302x:TubularAssetImpairmentChargesDomainus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:TubularAssetImpairmentChargesDomainus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:TubularAssetImpairmentChargesDomainus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302us-gaap:MaterialReconcilingItemsMemberx:UPIGainOnPreviousHoldingsMemberx:UPIMember2020-01-012020-12-310001163302us-gaap:MaterialReconcilingItemsMemberx:UPIGainOnPreviousHoldingsMemberx:UPIMember2019-01-012019-12-310001163302us-gaap:MaterialReconcilingItemsMemberx:UPIGainOnPreviousHoldingsMemberx:UPIMember2018-01-012018-12-310001163302x:TubularMemberx:TubularInventoryAdjustmentMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:TubularMemberx:TubularInventoryAdjustmentMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:TubularMemberx:TubularInventoryAdjustmentMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302us-gaap:FireMemberx:ClairtonMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302us-gaap:FireMemberx:ClairtonMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302us-gaap:FireMemberx:ClairtonMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302x:SaleOfPropertyMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:SaleOfPropertyMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:SaleOfPropertyMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302us-gaap:MaterialReconcilingItemsMemberx:DebtExtinguishmentChargesMember2020-01-012020-12-310001163302us-gaap:MaterialReconcilingItemsMemberx:DebtExtinguishmentChargesMember2019-01-012019-12-310001163302us-gaap:MaterialReconcilingItemsMemberx:DebtExtinguishmentChargesMember2018-01-012018-12-310001163302x:TransactionAndOtherRelatedCostsMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:TransactionAndOtherRelatedCostsMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:TransactionAndOtherRelatedCostsMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302x:UnitedSteelworkersLaborAgreementMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:UnitedSteelworkersLaborAgreementMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:UnitedSteelworkersLaborAgreementMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302x:RestartandrelatedcostsMemberx:GraniteCityMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:RestartandrelatedcostsMemberx:GraniteCityMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:RestartandrelatedcostsMemberx:GraniteCityMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302us-gaap:RestructuringChargesMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302us-gaap:RestructuringChargesMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302us-gaap:RestructuringChargesMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302x:TemporaryIdlingChargesMemberx:GraniteCityMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:TemporaryIdlingChargesMemberx:GraniteCityMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:TemporaryIdlingChargesMemberx:GraniteCityMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302x:GainlossonequityinvesteetransactionsMemberus-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001163302x:GainlossonequityinvesteetransactionsMemberus-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310001163302x:GainlossonequityinvesteetransactionsMemberus-gaap:MaterialReconcilingItemsMember2018-01-012018-12-310001163302srt:NorthAmericaMember2020-01-012020-12-310001163302srt:NorthAmericaMember2020-12-310001163302srt:NorthAmericaMember2019-01-012019-12-310001163302srt:NorthAmericaMember2019-12-310001163302srt:NorthAmericaMember2018-01-012018-12-310001163302srt:NorthAmericaMember2018-12-310001163302srt:EuropeMember2020-01-012020-12-310001163302srt:EuropeMember2020-12-310001163302srt:EuropeMember2019-01-012019-12-310001163302srt:EuropeMember2019-12-310001163302srt:EuropeMember2018-01-012018-12-310001163302srt:EuropeMember2018-12-310001163302country:US2020-12-310001163302country:US2019-12-310001163302country:US2018-12-310001163302x:BigRiverSteelMember2019-10-312019-10-310001163302x:BigRiverSteelMemberus-gaap:SubsequentEventMember2021-01-152021-01-15utr:T0001163302x:BigRiverSteelMember2020-11-300001163302x:USSPOSCOIndustriesUPIMember2020-02-290001163302x:USSPOSCOIndustriesUPIMember2020-02-292020-02-290001163302x:EnergyContractDomainx:USSPOSCOIndustriesUPIMember2020-02-292020-02-290001163302x:SemifinishedProductsMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberx:SemifinishedProductsMember2020-01-012020-12-310001163302x:SemifinishedProductsMemberx:TubularProductsMember2020-01-012020-12-310001163302x:SemifinishedProductsMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310001163302x:SemifinishedProductsMember2020-01-012020-12-310001163302x:HotrolledsheetsMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberx:HotrolledsheetsMember2020-01-012020-12-310001163302x:HotrolledsheetsMemberx:TubularProductsMember2020-01-012020-12-310001163302x:HotrolledsheetsMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310001163302x:HotrolledsheetsMember2020-01-012020-12-310001163302x:ColdrolledsheetsMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberx:ColdrolledsheetsMember2020-01-012020-12-310001163302x:TubularProductsMemberx:ColdrolledsheetsMember2020-01-012020-12-310001163302us-gaap:AllOtherSegmentsMemberx:ColdrolledsheetsMember2020-01-012020-12-310001163302x:ColdrolledsheetsMember2020-01-012020-12-310001163302x:CoatedsheetsMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberx:CoatedsheetsMember2020-01-012020-12-310001163302x:CoatedsheetsMemberx:TubularProductsMember2020-01-012020-12-310001163302x:CoatedsheetsMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310001163302x:CoatedsheetsMember2020-01-012020-12-310001163302x:TubularMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberx:TubularMember2020-01-012020-12-310001163302x:TubularMemberx:TubularProductsMember2020-01-012020-12-310001163302x:TubularMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310001163302x:TubularMember2020-01-012020-12-310001163302x:OtherProductsMemberx:FlatRolledProductsMember2020-01-012020-12-310001163302x:UsSteelEuropeMemberx:OtherProductsMember2020-01-012020-12-310001163302x:OtherProductsMemberx:TubularProductsMember2020-01-012020-12-310001163302x:OtherProductsMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310001163302x:OtherProductsMember2020-01-012020-12-310001163302x:SemifinishedProductsMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberx:SemifinishedProductsMember2019-01-012019-12-310001163302x:SemifinishedProductsMemberx:TubularProductsMember2019-01-012019-12-310001163302x:SemifinishedProductsMemberus-gaap:AllOtherSegmentsMember2019-01-012019-12-310001163302x:SemifinishedProductsMember2019-01-012019-12-310001163302x:HotrolledsheetsMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberx:HotrolledsheetsMember2019-01-012019-12-310001163302x:HotrolledsheetsMemberx:TubularProductsMember2019-01-012019-12-310001163302x:HotrolledsheetsMemberus-gaap:AllOtherSegmentsMember2019-01-012019-12-310001163302x:HotrolledsheetsMember2019-01-012019-12-310001163302x:ColdrolledsheetsMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberx:ColdrolledsheetsMember2019-01-012019-12-310001163302x:TubularProductsMemberx:ColdrolledsheetsMember2019-01-012019-12-310001163302us-gaap:AllOtherSegmentsMemberx:ColdrolledsheetsMember2019-01-012019-12-310001163302x:ColdrolledsheetsMember2019-01-012019-12-310001163302x:CoatedsheetsMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberx:CoatedsheetsMember2019-01-012019-12-310001163302x:CoatedsheetsMemberx:TubularProductsMember2019-01-012019-12-310001163302x:CoatedsheetsMemberus-gaap:AllOtherSegmentsMember2019-01-012019-12-310001163302x:CoatedsheetsMember2019-01-012019-12-310001163302x:TubularMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberx:TubularMember2019-01-012019-12-310001163302x:TubularMemberx:TubularProductsMember2019-01-012019-12-310001163302x:TubularMemberus-gaap:AllOtherSegmentsMember2019-01-012019-12-310001163302x:TubularMember2019-01-012019-12-310001163302x:OtherProductsMemberx:FlatRolledProductsMember2019-01-012019-12-310001163302x:UsSteelEuropeMemberx:OtherProductsMember2019-01-012019-12-310001163302x:OtherProductsMemberx:TubularProductsMember2019-01-012019-12-310001163302x:OtherProductsMemberus-gaap:AllOtherSegmentsMember2019-01-012019-12-310001163302x:OtherProductsMember2019-01-012019-12-310001163302x:SemifinishedProductsMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberx:SemifinishedProductsMember2018-01-012018-12-310001163302x:SemifinishedProductsMemberx:TubularProductsMember2018-01-012018-12-310001163302x:SemifinishedProductsMemberus-gaap:AllOtherSegmentsMember2018-01-012018-12-310001163302x:SemifinishedProductsMember2018-01-012018-12-310001163302x:HotrolledsheetsMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberx:HotrolledsheetsMember2018-01-012018-12-310001163302x:HotrolledsheetsMemberx:TubularProductsMember2018-01-012018-12-310001163302x:HotrolledsheetsMemberus-gaap:AllOtherSegmentsMember2018-01-012018-12-310001163302x:HotrolledsheetsMember2018-01-012018-12-310001163302x:ColdrolledsheetsMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberx:ColdrolledsheetsMember2018-01-012018-12-310001163302x:TubularProductsMemberx:ColdrolledsheetsMember2018-01-012018-12-310001163302us-gaap:AllOtherSegmentsMemberx:ColdrolledsheetsMember2018-01-012018-12-310001163302x:ColdrolledsheetsMember2018-01-012018-12-310001163302x:CoatedsheetsMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberx:CoatedsheetsMember2018-01-012018-12-310001163302x:CoatedsheetsMemberx:TubularProductsMember2018-01-012018-12-310001163302x:CoatedsheetsMemberus-gaap:AllOtherSegmentsMember2018-01-012018-12-310001163302x:CoatedsheetsMember2018-01-012018-12-310001163302x:TubularMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberx:TubularMember2018-01-012018-12-310001163302x:TubularMemberx:TubularProductsMember2018-01-012018-12-310001163302x:TubularMemberus-gaap:AllOtherSegmentsMember2018-01-012018-12-310001163302x:TubularMember2018-01-012018-12-310001163302x:OtherProductsMemberx:FlatRolledProductsMember2018-01-012018-12-310001163302x:UsSteelEuropeMemberx:OtherProductsMember2018-01-012018-12-310001163302x:OtherProductsMemberx:TubularProductsMember2018-01-012018-12-310001163302x:OtherProductsMemberus-gaap:AllOtherSegmentsMember2018-01-012018-12-310001163302x:OtherProductsMember2018-01-012018-12-310001163302x:FifthAmendedandRestatedCreditAgreementMember2020-01-012020-12-310001163302x:FifthAmendedandRestatedCreditAgreementMember2019-01-012019-12-310001163302x:FifthAmendedandRestatedCreditAgreementMember2018-01-012018-12-310001163302x:UsSteelKosiceRevolverMember2020-01-012020-12-310001163302x:UsSteelKosiceRevolverMember2019-01-012019-12-310001163302x:UsSteelKosiceRevolverMember2018-01-012018-12-310001163302us-gaap:StockCompensationPlanMember2020-01-012020-12-310001163302us-gaap:StockCompensationPlanMember2019-01-012019-12-310001163302us-gaap:StockCompensationPlanMember2018-01-012018-12-310001163302us-gaap:ConvertibleDebtSecuritiesMember2020-01-012020-12-310001163302us-gaap:ConvertibleDebtSecuritiesMember2019-01-012019-12-310001163302us-gaap:ConvertibleDebtSecuritiesMember2018-01-012018-12-3100011633022020-10-012020-12-3100011633022020-04-012020-06-3000011633022020-01-012020-03-3100011633022020-07-012020-09-3000011633022019-04-012019-06-3000011633022018-10-012018-12-3100011633022019-07-012019-09-3000011633022018-07-012018-09-3000011633022019-01-012019-03-3100011633022019-10-012019-12-3100011633022018-01-012018-03-3100011633022018-04-012018-06-300001163302country:US2020-01-012020-12-310001163302country:US2019-01-012019-12-310001163302country:US2018-01-012018-12-310001163302us-gaap:ForeignCountryMember2020-01-012020-12-310001163302us-gaap:ForeignCountryMember2019-01-012019-12-310001163302us-gaap:ForeignCountryMember2018-01-012018-12-310001163302us-gaap:DomesticCountryMember2020-12-310001163302us-gaap:DomesticCountryMember2019-12-310001163302us-gaap:StateAndLocalJurisdictionMember2020-12-310001163302us-gaap:StateAndLocalJurisdictionMember2019-12-310001163302us-gaap:ForeignCountryMember2020-12-310001163302us-gaap:ForeignCountryMember2019-12-310001163302us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember2020-01-012020-12-310001163302us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember2019-01-012019-12-310001163302us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember2018-01-012018-12-310001163302us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember2020-12-310001163302us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember2019-12-310001163302us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember2018-12-310001163302x:BigRiverSteelMembercountry:US2020-12-310001163302x:ChromeDepositCorporationMembercountry:US2020-12-310001163302x:DanielRossBridgeLimitedLiabilityCompanyMembercountry:US2020-12-310001163302country:USx:DoubleGCoatingsCompanyLimitedPartnershipMember2020-12-310001163302country:USx:HibbingDevelopmentCompanyMember2020-12-310001163302country:USx:HibbingTaconiteCompanyMember2020-12-310001163302country:USx:PatriotPremiumThreadingServicesMember2020-12-310001163302country:USx:ProTecCoatingCompanyMember2020-12-310001163302country:USx:StrategicInvestmentPartnersIIMember2020-12-310001163302country:USx:WorthingtonSpecialtyProcessingMember2020-12-310001163302country:USx:BigRiverSteelHoldingsLLCMember2020-12-310001163302country:USx:BRSStockHoldcoLLC.U.S.SteelBlockerLLCMember2020-12-310001163302x:FeralloyProcessingCompanyMember2020-01-012020-12-310001163302x:USSPOSCOIndustriesUPIMember2020-01-012020-12-310001163302x:LeedsRetailCenterLimitedLiabilityCompanyMember2018-01-012018-12-310001163302x:AceroPrimeS.R.L.deCVMember2018-01-012018-12-310001163302x:PatriotPremiumThreadingServicesLLCMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-01-012020-01-010001163302x:PatriotPremiumThreadingServicesLLCMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310001163302x:PatriotPremiumThreadingServicesLLCMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2019-12-310001163302us-gaap:BuildingMember2020-01-012020-12-310001163302srt:MinimumMemberx:SteelProducingEquipmentMember2020-01-012020-12-310001163302srt:MaximumMemberx:SteelProducingEquipmentMember2020-01-012020-12-310001163302us-gaap:TransportationEquipmentMembersrt:MinimumMember2020-01-012020-12-310001163302us-gaap:TransportationEquipmentMembersrt:MaximumMember2020-01-012020-12-310001163302us-gaap:OtherMachineryAndEquipmentMembersrt:MinimumMember2020-01-012020-12-310001163302us-gaap:OtherMachineryAndEquipmentMembersrt:MaximumMember2020-01-012020-12-310001163302us-gaap:TechnologyEquipmentMembersrt:MinimumMember2020-01-012020-12-310001163302us-gaap:TechnologyEquipmentMembersrt:MaximumMember2020-01-012020-12-310001163302x:AssetsHeldUnderFinanceLeasesMembersrt:MinimumMember2020-01-012020-12-310001163302x:AssetsHeldUnderFinanceLeasesMembersrt:MaximumMember2020-01-012020-12-310001163302us-gaap:CustomerRelationshipsMember2020-01-012020-12-310001163302us-gaap:CustomerRelationshipsMember2020-12-310001163302us-gaap:CustomerRelationshipsMember2019-12-310001163302us-gaap:PatentsMembersrt:MinimumMember2020-01-012020-12-310001163302srt:MaximumMemberus-gaap:PatentsMember2020-01-012020-12-310001163302us-gaap:PatentsMember2020-12-310001163302us-gaap:PatentsMember2019-12-310001163302x:EnergyContractMember2020-01-012020-12-310001163302x:EnergyContractMember2020-12-310001163302x:EnergyContractMember2019-12-310001163302us-gaap:OtherIntangibleAssetsMembersrt:MinimumMember2020-01-012020-12-310001163302us-gaap:OtherIntangibleAssetsMembersrt:MaximumMember2020-01-012020-12-310001163302us-gaap:OtherIntangibleAssetsMember2020-12-310001163302us-gaap:OtherIntangibleAssetsMember2019-12-310001163302us-gaap:UseRightsMember2019-12-310001163302us-gaap:UseRightsMember2020-12-310001163302x:OmnibusIncentiveCompensationPlan2016Member2016-04-260001163302x:OmnibusIncentiveCompensationPlan2016Member2017-04-250001163302x:OmnibusIncentiveCompensationPlan2016Member2020-04-280001163302x:StockIncentivePlanTwentyZeroFiveMember2020-12-310001163302us-gaap:RestrictedStockMember2020-01-012020-12-310001163302x:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2020-01-012020-12-310001163302x:ReturnOfCapitalEmployedMember2020-01-012020-12-310001163302us-gaap:RestrictedStockMember2019-01-012019-12-310001163302x:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2019-01-012019-12-310001163302x:ReturnOfCapitalEmployedMember2019-01-012019-12-310001163302us-gaap:RestrictedStockMember2018-01-012018-12-310001163302x:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2018-01-012018-12-310001163302x:ReturnOfCapitalEmployedMember2018-01-012018-12-310001163302us-gaap:CostOfSalesMember2020-01-012020-12-310001163302us-gaap:CostOfSalesMember2019-01-012019-12-310001163302us-gaap:CostOfSalesMember2018-01-012018-12-310001163302us-gaap:SellingGeneralAndAdministrativeExpensesMember2020-01-012020-12-310001163302us-gaap:SellingGeneralAndAdministrativeExpensesMember2019-01-012019-12-310001163302us-gaap:SellingGeneralAndAdministrativeExpensesMember2018-01-012018-12-310001163302us-gaap:EmployeeStockOptionMember2020-01-012020-12-310001163302us-gaap:RestrictedStockMemberus-gaap:ShareBasedCompensationAwardTrancheOneMember2020-01-012020-12-310001163302x:ReturnOnCapitalEmployedROCEPerformanceBasedRestrictedStockMember2020-01-012020-12-310001163302x:PeriodOneMemberx:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2020-12-310001163302x:PeriodOneMemberx:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2020-01-012020-12-310001163302x:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMemberx:PeriodTwoMember2020-12-310001163302x:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMemberx:PeriodTwoMember2020-01-012020-12-310001163302x:PeriodThreeMemberx:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2020-12-310001163302x:PeriodThreeMemberx:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2020-01-012020-12-310001163302us-gaap:RestrictedStockMember2019-12-310001163302x:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2019-12-310001163302x:ReturnOnCapitalEmployedROCEPerformanceBasedRestrictedStockMember2019-12-310001163302us-gaap:RestrictedStockMember2020-12-310001163302x:TotalStockholdersReturnTSRPerformanceBasedRestrictedStockMember2020-12-310001163302x:ReturnOnCapitalEmployedROCEPerformanceBasedRestrictedStockMember2020-12-310001163302x:RestrictedStockUnitsAndPerformanceStockUnitsMember2020-01-012020-12-310001163302x:RestrictedStockUnitsAndPerformanceStockUnitsMember2019-01-012019-12-310001163302x:RestrictedStockUnitsAndPerformanceStockUnitsMember2018-01-012018-12-310001163302x:RestrictedStockUnitsAndPerformanceStockUnitsMember2020-12-310001163302x:RestrictedStockUnitsAndPerformanceStockUnitsMember2019-12-310001163302x:RestrictedStockUnitsAndPerformanceStockUnitsMember2018-12-310001163302srt:MaximumMemberus-gaap:ForeignExchangeForwardMember2020-01-012020-12-31utr:MMBTU0001163302srt:NaturalGasReservesMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302srt:NaturalGasReservesMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302x:TinMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302x:TinMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302x:ZincMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302x:ZincMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302us-gaap:ElectricityMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302us-gaap:ElectricityMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302x:HotrolledCoilMemberus-gaap:CashFlowHedgingMemberx:SalesSwapMember2020-12-310001163302x:HotrolledCoilMemberus-gaap:CashFlowHedgingMemberx:SalesSwapMember2019-12-31iso4217:EUR0001163302us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeForwardMember2020-12-310001163302us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeForwardMember2019-12-31iso4217:CAD0001163302us-gaap:AccountsPayableMemberus-gaap:CashFlowHedgingMemberx:SalesSwapMember2020-12-310001163302us-gaap:AccountsPayableMemberus-gaap:CashFlowHedgingMemberx:SalesSwapMember2019-12-310001163302us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CashFlowHedgingMemberx:SalesSwapMember2020-12-310001163302us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CashFlowHedgingMemberx:SalesSwapMember2019-12-310001163302us-gaap:AccountsReceivableMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302us-gaap:AccountsReceivableMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302us-gaap:AccountsPayableMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302us-gaap:AccountsPayableMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302x:InvestmentsandlongtermreceivablesMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302x:InvestmentsandlongtermreceivablesMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302us-gaap:OtherNoncurrentLiabilitiesMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2020-12-310001163302us-gaap:OtherNoncurrentLiabilitiesMemberx:CommoditySwapMemberus-gaap:CashFlowHedgingMember2019-12-310001163302us-gaap:AccountsPayableMemberus-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeForwardMember2020-12-310001163302us-gaap:AccountsPayableMemberus-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeForwardMember2019-12-310001163302us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeForwardMember2020-12-310001163302us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeForwardMember2019-12-310001163302x:SalesSwapMember2020-01-012020-12-310001163302x:SalesSwapMember2019-01-012019-12-310001163302x:SalesSwapMember2018-01-012018-12-310001163302us-gaap:SalesRevenueNetMemberx:SalesSwapMember2020-01-012020-12-310001163302us-gaap:SalesRevenueNetMemberx:SalesSwapMember2019-01-012019-12-310001163302us-gaap:SalesRevenueNetMemberx:SalesSwapMember2018-01-012018-12-310001163302x:CommoditySwapMember2020-01-012020-12-310001163302x:CommoditySwapMember2019-01-012019-12-310001163302x:CommoditySwapMember2018-01-012018-12-310001163302us-gaap:CostOfSalesMemberx:CommoditySwapMember2020-01-012020-12-310001163302us-gaap:CostOfSalesMemberx:CommoditySwapMember2019-01-012019-12-310001163302us-gaap:CostOfSalesMemberx:CommoditySwapMember2018-01-012018-12-310001163302us-gaap:ForeignExchangeForwardMember2020-01-012020-12-310001163302us-gaap:ForeignExchangeForwardMember2019-01-012019-12-310001163302us-gaap:ForeignExchangeForwardMember2018-01-012018-12-310001163302us-gaap:CostOfSalesMemberus-gaap:ForeignExchangeForwardMember2020-01-012020-12-310001163302us-gaap:CostOfSalesMemberus-gaap:ForeignExchangeForwardMember2019-01-012019-12-310001163302us-gaap:CostOfSalesMemberus-gaap:ForeignExchangeForwardMember2018-01-012018-12-310001163302us-gaap:OtherExpenseMemberus-gaap:ForeignExchangeForwardMember2020-01-012020-12-310001163302us-gaap:OtherExpenseMemberus-gaap:ForeignExchangeForwardMember2019-01-012019-12-310001163302us-gaap:OtherExpenseMemberus-gaap:ForeignExchangeForwardMember2018-01-012018-12-310001163302srt:MaximumMemberus-gaap:DesignatedAsHedgingInstrumentMemberx:CommoditySwapMember2020-01-012020-12-310001163302srt:MaximumMemberx:SalesSwapMember2020-01-012020-12-310001163302srt:MaximumMemberus-gaap:NondesignatedMemberx:CommoditySwapMember2020-01-012020-12-310001163302x:SeniorNotesDueTwentyThirtySevenMember2020-12-310001163302x:SeniorNotesDueTwentyThirtySevenMember2019-12-310001163302x:SeniorNotesDueTwentyTwentySixDomain2020-12-310001163302x:SeniorNotesDueTwentyTwentySixDomain2019-12-310001163302x:A2026SeniorConvertibleNotesMember2020-12-310001163302x:A2026SeniorConvertibleNotesMember2019-12-310001163302x:SeniorNotesDueTwentyTwentyFiveMember2020-12-310001163302x:SeniorNotesDueTwentyTwentyFiveMember2019-12-310001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMember2020-12-310001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMember2019-12-310001163302x:ExportImportCreditAgreementMember2020-01-012020-12-310001163302x:ExportImportCreditAgreementMember2020-12-310001163302x:ExportImportCreditAgreementMember2019-12-310001163302x:EnvironmentalRevenueBondsMembersrt:MinimumMember2020-12-310001163302x:EnvironmentalRevenueBondsMembersrt:MaximumMember2020-12-310001163302x:EnvironmentalRevenueBondsMember2020-12-310001163302x:EnvironmentalRevenueBondsMember2019-12-310001163302x:DebtAndFinanceLeaseObligationsOtherMember2020-12-310001163302x:DebtAndFinanceLeaseObligationsOtherMember2019-12-310001163302x:ExportCreditAgreementMember2020-01-012020-12-310001163302x:ExportCreditAgreementMember2020-12-310001163302x:ExportCreditAgreementMember2019-12-310001163302x:FifthAmendedandRestatedCreditAgreementMember2020-12-310001163302x:FifthAmendedandRestatedCreditAgreementMember2019-12-310001163302x:UPICreditFacilityMember2020-01-012020-12-310001163302x:UPICreditFacilityMember2020-12-310001163302x:UPICreditFacilityMember2019-12-310001163302x:UsSteelKosiceRevolverMember2020-12-310001163302x:UsSteelKosiceRevolverMember2019-12-310001163302x:UsSteelKosiceCreditFacilityMember2020-01-012020-12-310001163302x:UsSteelKosiceCreditFacilityMember2020-12-310001163302x:UsSteelKosiceCreditFacilityMember2019-12-310001163302us-gaap:LineOfCreditMemberx:ExportImportCreditAgreementMember2020-09-300001163302us-gaap:LineOfCreditMemberx:ExportImportCreditAgreementMember2020-09-302020-09-300001163302us-gaap:LineOfCreditMemberus-gaap:LondonInterbankOfferedRateLIBORMemberx:ExportImportCreditAgreementMember2020-09-302020-09-300001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:SecuredDebtMember2020-05-290001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:SecuredDebtMember2020-05-292020-05-290001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:SecuredDebtMemberus-gaap:DebtInstrumentRedemptionPeriodTwoMember2020-05-292020-05-290001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:DebtInstrumentRedemptionPeriodThreeMemberus-gaap:SecuredDebtMember2020-05-292020-05-290001163302us-gaap:DebtInstrumentRedemptionPeriodFourMemberx:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:SecuredDebtMember2020-05-292020-05-290001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:SecuredDebtMemberus-gaap:DebtInstrumentRedemptionPeriodOneMember2020-05-290001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:SecuredDebtMemberus-gaap:DebtInstrumentRedemptionPeriodOneMember2020-05-292020-05-290001163302x:ExportCreditAgreementMember2020-02-192020-02-190001163302x:ExportCreditAgreementMembersrt:MaximumMember2020-02-192020-02-190001163302x:FifthAmendedandRestatedCreditAgreementMemberx:CovenantRequirementMember2020-12-310001163302x:UsSteelKosiceRevolverMemberus-gaap:RevolvingCreditFacilityMember2020-12-310001163302x:UsSteelKosiceRevolverMemberus-gaap:RevolvingCreditFacilityMember2019-12-310001163302x:UsSteelKosiceRevolverMemberus-gaap:SubsequentEventMemberus-gaap:RevolvingCreditFacilityMember2021-06-300001163302x:UsSteelKosiceRevolverMemberus-gaap:SubsequentEventMemberus-gaap:RevolvingCreditFacilityMember2021-12-310001163302x:UsSteelKosiceCreditFacilityMemberus-gaap:RevolvingCreditFacilityMember2020-12-310001163302x:USSK20MillionUnsecuredCreditFacilityMemberus-gaap:RevolvingCreditFacilityMember2020-12-310001163302x:UsSteelKosiceTenMillionCreditFacilityMemberus-gaap:RevolvingCreditFacilityMember2020-12-310001163302x:ChangeInControlDebtObligationsMembersrt:MaximumMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:USSPOSCOIndustriesUPIMember2020-02-290001163302x:USSPOSCOIndustriesUPIMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-02-2900011633022018-11-132018-11-1300011633022018-11-130001163302us-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMember2018-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-12-310001163302us-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310001163302us-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310001163302us-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2020-01-012020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2020-01-012020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2020-01-012020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2020-01-012020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:RetireemedicalandlifeinsuranceMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMember2018-01-012018-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-01-012018-12-310001163302x:SteelworkersPensionTrustMember2020-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2020-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2019-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ForeignCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ForeignCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:MineralInterestsDomain2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomainus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomain2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomain2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomain2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:MineralInterestsDomain2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomainus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomain2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomain2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:MineralInterestsDomain2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMemberus-gaap:FairValueInputsLevel1Member2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMemberus-gaap:FairValueInputsLevel1Member2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:RealEstateMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:CommingledFundsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:CommingledFundsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:CommingledFundsMember2019-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2019-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:OtherSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:OtherSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:OtherSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:OtherSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:OtherSecuritiesMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberx:OtherSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:OtherSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberx:OtherSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberx:OtherSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:OtherSecuritiesMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DomesticCorporateDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:ForeignCorporateDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanDebtSecurityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:ProductiveLandMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:PrivateEquityFundsMember2019-12-310001163302us-gaap:RealEstateMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:RealEstateMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:RealEstateMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:DefinedBenefitPlanAlternativeInvestmentsMember2019-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberx:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302x:DefinedBenefitPlanShortTermInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:OtherSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberx:OtherSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberx:OtherSecuritiesMember2019-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001163302us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:UnitedStatesSteelPensionPlanMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:UnitedStatesSteelPensionPlanMembersrt:ScenarioForecastMember2021-01-012021-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:UnitedStatesSteelPensionPlanMember2020-01-012020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:UPIPensionPlanMember2020-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:UPIPensionPlanMembersrt:ScenarioForecastMember2021-01-012021-12-310001163302us-gaap:PensionPlansDefinedBenefitMemberx:UPIPensionPlanMember2020-01-012020-12-310001163302x:SteelworkersPensionTrustMember2020-01-012020-12-310001163302x:SteelworkersPensionTrustMember2020-01-012020-01-010001163302x:SteelworkersPensionTrustMembersrt:MinimumMember2020-01-012020-12-310001163302x:SteelworkersPensionTrustMembersrt:MinimumMember2019-01-012019-12-310001163302x:SteelworkersPensionTrustMembersrt:MinimumMember2018-01-012018-12-310001163302x:SteelworkersPensionTrustMember2008-01-012008-12-310001163302x:GreenZoneMemberx:SteelworkersPensionTrustMembersrt:MinimumMember2020-12-310001163302x:SteelworkersPensionTrustMembersrt:MaximumMemberx:YellowZoneMember2020-12-310001163302x:SteelworkersPensionTrustMembersrt:MaximumMemberx:RedZoneMember2020-12-310001163302x:UnfundedDefinedBenefitPensionPlansMember2020-01-012020-12-310001163302x:UnfundedDefinedBenefitPensionPlansMember2019-01-012019-12-310001163302x:UnfundedDefinedBenefitPensionPlansMember2018-01-012018-12-310001163302x:UnfundedOtherPostretirementBenefitPlansMember2020-01-012020-12-310001163302x:UnfundedOtherPostretirementBenefitPlansMember2019-01-012019-12-310001163302x:UnfundedOtherPostretirementBenefitPlansMember2018-01-012018-12-310001163302x:DefinedContributionPensionPlanMember2020-01-012020-12-310001163302x:DefinedContributionPensionPlanMember2019-01-012019-12-310001163302x:DefinedContributionPensionPlanMember2018-01-012018-12-310001163302x:DefinedContributionPensionMatchingContributionMember2020-01-012020-12-310001163302x:DefinedContributionPensionMatchingContributionMember2019-01-012019-12-310001163302x:DefinedContributionPensionMatchingContributionMember2018-01-012018-12-310001163302x:SupplementalThriftPlanMember2020-01-012020-12-310001163302x:SupplementalThriftPlanMember2019-01-012019-12-310001163302x:SupplementalThriftPlanMember2018-01-012018-12-3100011633022019-01-012019-01-0100011633022020-01-012020-01-010001163302us-gaap:SubsequentEventMember2021-01-012021-01-010001163302x:CanadianHourlyEmployeesSavingsMatchMember2020-01-012020-12-310001163302x:CanadianHourlyEmployeesSavingsMatchMember2019-01-012019-12-310001163302x:CanadianHourlyEmployeesSavingsMatchMember2018-01-012018-12-310001163302x:OtherPostemploymentBenefitMember2020-12-310001163302x:OtherPostemploymentBenefitMember2019-12-310001163302srt:ScenarioForecastMember2021-12-310001163302x:BigRiverSteelMember2019-10-310001163302x:BigRiverSteelMemberx:OtherBigRiverSteelEquityOwnersMember2019-10-310001163302x:BigRiverSteelMember2019-10-312019-10-310001163302x:BigRiverSteelMember2020-12-080001163302us-gaap:FairValueInputsLevel3Memberx:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:IncomeApproachValuationTechniqueMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:MeasurementInputLongTermRevenueGrowthRateMember2020-12-310001163302us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:IncomeApproachValuationTechniqueMember2020-12-3100011633022019-11-012019-12-310001163302us-gaap:CallOptionMember2019-10-310001163302us-gaap:CallOptionMember2019-11-012019-12-310001163302us-gaap:CallOptionMember2019-12-310001163302us-gaap:CallOptionMember2020-01-012020-12-310001163302us-gaap:CallOptionMember2020-12-310001163302us-gaap:CommonClassBMemberus-gaap:PutOptionMember2019-10-310001163302us-gaap:CommonClassBMemberus-gaap:PutOptionMember2019-11-012019-12-310001163302us-gaap:CommonClassBMemberus-gaap:PutOptionMember2019-12-310001163302us-gaap:CommonClassBMemberus-gaap:PutOptionMember2020-01-012020-12-310001163302us-gaap:CommonClassBMemberus-gaap:PutOptionMember2020-12-310001163302us-gaap:CallOptionMemberus-gaap:CommonClassBMember2019-10-310001163302us-gaap:CallOptionMemberus-gaap:CommonClassBMember2019-11-012019-12-310001163302us-gaap:CallOptionMemberus-gaap:CommonClassBMember2019-12-310001163302us-gaap:CallOptionMemberus-gaap:CommonClassBMember2020-01-012020-12-310001163302us-gaap:CallOptionMemberus-gaap:CommonClassBMember2020-12-310001163302x:ContingentForwardAssetMember2019-10-310001163302x:ContingentForwardAssetMember2019-11-012019-12-310001163302x:ContingentForwardAssetMember2019-12-310001163302x:ContingentForwardAssetMember2020-01-012020-12-310001163302x:ContingentForwardAssetMember2020-12-310001163302x:StelcoMemberx:MinntacMineMember2020-04-300001163302x:StelcoMemberx:MinntacMineMember2020-04-302020-04-30x:installment0001163302us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310001163302us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310001163302us-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001163302us-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2018-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2019-01-012019-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2019-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-01-012020-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001163302us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001163302us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001163302us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001163302us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001163302us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001163302x:UssPoscoIndustriesJointVentureMember2020-02-290001163302x:OutsideProcessingServicesMember2020-01-012020-12-310001163302x:OutsideProcessingServicesMember2019-01-012019-12-310001163302x:OutsideProcessingServicesMember2018-01-012018-12-310001163302x:TaconitePelletsMember2020-01-012020-12-310001163302x:TaconitePelletsMember2019-01-012019-12-310001163302x:TaconitePelletsMember2018-01-012018-12-310001163302x:ProTecCoatingCompanyMember2020-12-310001163302x:ProTecCoatingCompanyMember2019-12-310001163302x:OtherRelatedPartiesMember2020-12-310001163302x:OtherRelatedPartiesMember2019-12-310001163302x:KeetacMiningAndGreatLakesWorksRestructuringMember2020-01-012020-12-310001163302x:LorainTubularOperationsAndLoneStarTubularOperationsRestructuringMember2020-01-012020-12-310001163302x:CompanyWideHeadcountReductionsMember2020-01-012020-12-310001163302x:VoluntaryEarlyRetirementProgramMember2020-01-012020-12-310001163302x:BusinessExitAndEmployeeSeveranceMember2020-01-012020-12-310001163302x:PostretirementBenefitTrustVEBAMemberx:BusinessExitAndEmployeeSeveranceMember2020-01-012020-12-310001163302x:U.S.SteelKosiceRestructuringPlanMember2019-01-012019-12-310001163302us-gaap:FacilityClosingMemberx:EastChicagoRestructuringPlanMember2019-01-012019-12-310001163302us-gaap:OneTimeTerminationBenefitsMember2019-01-012019-12-310001163302us-gaap:EmployeeSeveranceMember2018-12-310001163302us-gaap:FacilityClosingMember2018-12-310001163302us-gaap:OtherRestructuringMember2018-12-310001163302us-gaap:EmployeeSeveranceMember2019-01-012019-12-310001163302us-gaap:FacilityClosingMember2019-01-012019-12-310001163302us-gaap:OtherRestructuringMember2019-01-012019-12-310001163302us-gaap:EmployeeSeveranceMember2019-12-310001163302us-gaap:FacilityClosingMember2019-12-310001163302us-gaap:OtherRestructuringMember2019-12-310001163302us-gaap:EmployeeSeveranceMember2020-01-012020-12-310001163302us-gaap:FacilityClosingMember2020-01-012020-12-310001163302us-gaap:OtherRestructuringMember2020-01-012020-12-310001163302us-gaap:EmployeeSeveranceMember2020-12-310001163302us-gaap:FacilityClosingMember2020-12-310001163302us-gaap:OtherRestructuringMember2020-12-310001163302us-gaap:AccountsPayableMember2020-12-310001163302us-gaap:AccountsPayableMember2019-12-310001163302x:PayrollandBenefitsPayableMember2020-12-310001163302x:PayrollandBenefitsPayableMember2019-12-310001163302x:LiabilityPensionandOtherPostretirementandPostemploymentBenefitsNoncurrentMember2020-12-310001163302x:LiabilityPensionandOtherPostretirementandPostemploymentBenefitsNoncurrentMember2019-12-310001163302x:OtherNoncurrentLiabilitiesAndDeferredCreditsMember2020-12-310001163302x:OtherNoncurrentLiabilitiesAndDeferredCreditsMember2019-12-31x:Claim_Group0001163302us-gaap:AsbestosIssueMember2020-12-31x:Plaintiff0001163302us-gaap:AsbestosIssueMember2020-01-012020-12-310001163302us-gaap:AsbestosIssueMember2019-12-310001163302us-gaap:AsbestosIssueMember2017-12-310001163302us-gaap:AsbestosIssueMember2018-01-012018-12-310001163302us-gaap:AsbestosIssueMember2018-12-310001163302us-gaap:AsbestosIssueMember2019-01-012019-12-31x:claim0001163302us-gaap:AccountsPayableMember2020-12-310001163302us-gaap:AccountsPayableMember2019-12-310001163302x:OtherNoncurrentLiabilitiesAndDeferredCreditsMember2020-12-310001163302x:OtherNoncurrentLiabilitiesAndDeferredCreditsMember2019-12-310001163302srt:MinimumMember2020-01-012020-12-310001163302srt:MaximumMember2020-01-012020-12-31x:Facility0001163302x:ProjectsWithOngoingStudyAndScopeDevelopmentMember2020-12-310001163302x:ProjectsWithOngoingStudyAndScopeDevelopmentMembersrt:MinimumMember2020-01-012020-12-310001163302x:ProjectsWithOngoingStudyAndScopeDevelopmentMembersrt:MaximumMember2020-01-012020-12-31x:Project0001163302x:OtherProjectWithDefinedScopeMember2020-12-310001163302x:OtherProjectWithDefinedScopeMembersrt:MinimumMember2020-12-310001163302x:GaryWorksProjectWithDefinedScopeMember2020-12-310001163302x:GenevaProjectMember2020-12-310001163302x:CherryvaleZincSiteMember2020-12-310001163302x:StLouisEstuaryProjectMember2020-12-310001163302x:OtherEnvironmentalRemediationProjectsMember2020-12-310001163302x:OtherEnvironmentalRemediationProjectsMembersrt:MinimumMember2020-12-310001163302x:OtherEnvironmentalRemediationProjectsMembersrt:MaximumMember2020-12-310001163302srt:MaximumMemberx:EnvironmentalRemediationProjectsLessThanOneMillionMember2020-12-310001163302x:EnvironmentalRemediationProjectsLessThanOneMillionMember2020-12-31x:Allowances0001163302us-gaap:SuretyBondMember2020-12-310001163302x:GatewayEnergyAndCokeCompanyLimitedLiabilityCompanyMember2020-12-310001163302x:PublicOfferingMember2020-06-222020-06-220001163302x:PublicOfferingMember2020-06-2200011633022018-11-300001163302x:BigRiverSteelMemberus-gaap:SubsequentEventMember2021-01-150001163302us-gaap:SecuredDebtMemberx:A6625SeniorSecuredNotesDueJanuary312029Memberus-gaap:SubsequentEventMember2021-01-150001163302x:BondsPayableMemberx:A450ArkansasDevelopmentFinanceAuthorityBondsDueSeptember12049Memberus-gaap:SubsequentEventMember2021-01-150001163302x:A475ArkansasDevelopmentFinanceAuthorityBondsTaxExemptSeries2020GreenBondsDueSeptember12049Memberx:BondsPayableMemberus-gaap:SubsequentEventMember2021-01-150001163302x:OtherLoanAndLeaseDebtInstrumentsMemberus-gaap:SubsequentEventMember2021-01-150001163302us-gaap:SubsequentEventMember2021-02-052021-02-050001163302srt:ScenarioForecastMember2021-02-052021-03-070001163302us-gaap:SeniorNotesMemberx:SeniorNotesDue2029Memberus-gaap:SubsequentEventMember2021-02-080001163302x:A12000SeniorSecuredNotesDueJune120252025SeniorSecuredNotesMemberus-gaap:SecuredDebtMemberus-gaap:SubsequentEventMember2021-02-020001163302x:UsSteelKosiceRevolverMemberus-gaap:SubsequentEventMemberus-gaap:RevolvingCreditFacilityMember2021-01-152021-01-150001163302x:BigRiverCreditFacilityMemberus-gaap:SubsequentEventMemberus-gaap:RevolvingCreditFacilityMember2021-01-220001163302x:FifthAmendedandRestatedCreditAgreementMemberus-gaap:SubsequentEventMemberus-gaap:RevolvingCreditFacilityMember2021-01-292021-01-290001163302x:FifthAmendedandRestatedCreditAgreementMemberus-gaap:SubsequentEventMemberus-gaap:RevolvingCreditFacilityMember2021-02-102021-02-100001163302us-gaap:AllowanceForCreditLossMember2019-12-310001163302us-gaap:AllowanceForCreditLossMember2020-01-012020-12-310001163302us-gaap:AllowanceForCreditLossMember2020-12-310001163302x:InvestmentsAndLongTermReceivablesReserveMember2019-12-310001163302x:InvestmentsAndLongTermReceivablesReserveMember2020-01-012020-12-310001163302x:InvestmentsAndLongTermReceivablesReserveMember2020-12-310001163302x:ValuationAllowanceOfDeferredTaxDomesticMember2019-12-310001163302x:ValuationAllowanceOfDeferredTaxDomesticMember2020-01-012020-12-310001163302x:ValuationAllowanceOfDeferredTaxDomesticMember2020-12-310001163302x:ValuationAllowanceOfDeferredTaxForeignMember2019-12-310001163302x:ValuationAllowanceOfDeferredTaxForeignMember2020-01-012020-12-310001163302x:ValuationAllowanceOfDeferredTaxForeignMember2020-12-310001163302us-gaap:AllowanceForCreditLossMember2018-12-310001163302us-gaap:AllowanceForCreditLossMember2019-01-012019-12-310001163302x:InvestmentsAndLongTermReceivablesReserveMember2018-12-310001163302x:InvestmentsAndLongTermReceivablesReserveMember2019-01-012019-12-310001163302x:ValuationAllowanceOfDeferredTaxDomesticMember2018-12-310001163302x:ValuationAllowanceOfDeferredTaxDomesticMember2019-01-012019-12-310001163302x:ValuationAllowanceOfDeferredTaxForeignMember2018-12-310001163302x:ValuationAllowanceOfDeferredTaxForeignMember2019-01-012019-12-310001163302us-gaap:AllowanceForCreditLossMember2017-12-310001163302us-gaap:AllowanceForCreditLossMember2018-01-012018-12-310001163302x:InvestmentsAndLongTermReceivablesReserveMember2017-12-310001163302x:InvestmentsAndLongTermReceivablesReserveMember2018-01-012018-12-310001163302x:ValuationAllowanceOfDeferredTaxDomesticMember2017-12-310001163302x:ValuationAllowanceOfDeferredTaxDomesticMember2018-01-012018-12-310001163302x:ValuationAllowanceOfDeferredTaxForeignMember2017-12-310001163302x:ValuationAllowanceOfDeferredTaxForeignMember2018-01-012018-12-31

        2020
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K
(Mark One)
 
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Fiscal Year Ended December 31, 2020
Or
 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                      to                     .
Commission file number 1-16811
x-20201231_g1.jpg
United States Steel Corporation
(Exact name of registrant as specified in its charter)
Delaware25-1897152
(State of Incorporation)(I.R.S. Employer Identification No.)
600 Grant Street, Pittsburgh, PA 15219-2800
(Address of principal executive offices)
Tel. No. (412433-1121
Securities registered pursuant to Section 12 (b) of the Act:
Title of Each ClassTrading SymbolName of Exchange on which Registered
United States Steel Corporation Common Stock, par value $1.00XNew York Stock Exchange
United States Steel Corporation Common Stock, par value $1.00XChicago Stock Exchange
 
Securities registered pursuant to Section 12(g) of the Act: None
Indicate by check mark whether the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes      No    
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes        No         
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for at least the past 90 days.  Yes          No             
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes          No             
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or emerging growth company. See the definition of “large accelerated filer,” “accelerated filer," “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act. 
Large accelerated filer
Accelerated filer
Non-accelerated filer
Smaller reporting company
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ___
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. Yes      No    
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).   Yes  No
Aggregate market value of Common Stock held by non-affiliates as of June 30, 2020 (the last business day of the registrant’s most recently completed second fiscal quarter): $1.6 billion. The amount shown is based on the closing price of the registrant’s Common Stock on the New York Stock Exchange composite tape on that date. Shares of Common Stock held by executive officers and directors of the registrant are not included in the computation. However, the registrant has made no determination that such individuals are “affiliates” within the meaning of Rule 405 under the Securities Act of 1933.
There were 262,471,855 shares of United States Steel Corporation Common Stock outstanding as of February 8, 2021.
Documents Incorporated By Reference:
    Portions of the Proxy Statement for the 2021 Annual Meeting of Stockholders are incorporated into Part III.



INDEX
Item 1.
Item 1A
Item 1B
Item 2.
Item 3.
Item 4.
Item 5.
Item 6.
Item 7.
Item 7A
Item 8.
Item 9.
Item 9A
Item 9B
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.
Item 15.
Item 16.
TOTAL NUMBER OF PAGES162 


Table of Contents
FORWARD-LOOKING STATEMENTS

This report contains information that may constitute “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. We intend the forward-looking statements to be covered by the safe harbor provisions for forward-looking statements in those sections. Generally, we have identified such forward-looking statements by using the words “believe,” “expect,” “intend,” “estimate,” “anticipate,” “project,” “target,” “forecast,” “aim,” “should,” “will,” "may" and similar expressions or by using future dates in connection with any discussion of, among other things, operating performance, trends, events or developments that we expect or anticipate will occur in the future, statements relating to volume changes, share of sales and earnings per share changes, anticipated cost savings, potential capital and operational cash improvements, anticipated disruptions to our operations and industry due to the COVID-19 pandemic, changes in global supply and demand conditions and prices for our products, international trade duties and other aspects of international trade policy, the integration of Big River Steel in our existing business, business strategies related to the combined business and statements expressing general views about future operating results. However, the absence of these words or similar expressions does not mean that a statement is not forward-looking. Forward-looking statements are not historical facts, but instead represent only the Company’s beliefs regarding future events, many of which, by their nature, are inherently uncertain and outside of the Company’s control. It is possible that the Company’s actual results and financial condition may differ, possibly materially, from the anticipated results and financial condition indicated in these forward-looking statements. Management believes that these forward-looking statements are reasonable as of the time made. However, caution should be taken not to place undue reliance on any such forward-looking statements because such statements speak only as of the date when made. Our Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law. In addition, forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from our Company's historical experience and our present expectations or projections. These risks and uncertainties include, but are not limited to the risks and uncertainties described in this report in “Item 1A. Risk Factors” and those described from time to time in our future reports filed with the Securities and Exchange Commission.

References in this Annual Report on Form 10-K to "U. S. Steel," "the Company," "we," "us," and "our" refer to United States Steel Corporation and its consolidated subsidiaries unless otherwise indicated by the context.

Non-Generally Accepted Accounting Principles (non-GAAP) Financial Measures

This report contains certain non-GAAP financial measures such as earnings (loss) before interest, income taxes, depreciation, depletion and amortization (EBITDA), adjusted EBITDA, adjusted net earnings (loss), adjusted net earnings (loss) per diluted share, free cash flow, net debt and cash conversion cycle.

We believe that EBITDA, considered along with the net earnings (loss), is a relevant indicator of trends relating to cash generating activity and provides management and investors with additional information for comparison of our operating results to the operating results of other companies.

Adjusted net earnings (loss) and adjusted net earnings (loss) per diluted share are non-GAAP measures that exclude the effects of items that include: the asset impairment charge, restructuring and other charges, the Fairless property sale, the Big River Steel options and forward adjustments, the December 24, 2018 Clairton coke making facility fire, the tax valuation allowance, loss on extinguishment of debt and other related costs, the USW labor agreement signing bonus and related costs, Granite City Works restart and related costs and gain on equity investee transactions that are not part of the Company's core operations (Adjustment Items). Adjusted EBITDA is also a non-GAAP measure that excludes the effects of certain Adjustment Items. We present adjusted net earnings (loss), adjusted net earnings (loss) per diluted share and adjusted EBITDA to enhance the understanding of our ongoing operating performance and established trends affecting our core operations, by excluding the effects of events that can obscure underlying trends. U. S. Steel's management considers adjusted net earnings (loss), adjusted net earnings (loss) per diluted share and adjusted EBITDA as alternative measures of operating performance and not alternative measures of the Company's liquidity. U. S. Steel’s management considers adjusted net earnings (loss), adjusted net earnings (loss) per diluted share and adjusted EBITDA useful to investors by facilitating a comparison of our operating performance to the operating performance of our competitors. Additionally, the presentation of adjusted net earnings (loss), adjusted net earnings (loss) per diluted share and adjusted EBITDA provides insight into management’s view and assessment of the Company’s ongoing operating performance, because management does not consider the adjusting items when evaluating the Company’s financial performance. Adjusted net earnings (loss), adjusted net earnings (loss) per diluted share and adjusted EBITDA should not be considered a substitute for net earnings (loss), earnings (loss) per diluted share or other financial measures as computed in accordance with U.S. GAAP and is not necessarily comparable to similarly titled measures used by other companies.

Net debt is a non-GAAP measure calculated as total debt less cash and cash equivalents. We believe net debt is a useful measure in calculating enterprise value. Both EBITDA and net debt are used by analysts to refine and improve the accuracy of their financial models which utilize enterprise value.

Free cash flow is a measure of cash generated from operations, after any investing activity and dividends paid to stockholders. We believe that free cash flow provides further insight into the Company's overall utilization of cash.

3

Table of Contents
We believe the cash conversion cycle is a useful measure in providing investors with information regarding our cash management performance and is a widely accepted measure of working capital management efficiency. The cash conversion cycle should not be considered in isolation or as an alternative to other GAAP metrics as an indicator of performance.

10-K SUMMARY

This section provides an overview of U. S. Steel's business, strategy and financial performance for 2020. It does not contain all of the information that may be important to a reader. Please read the entire Annual Report on Form 10-K.

Our vision is for U. S. Steel to be a solutions provider to our customers through a unique offering of product and process innovation that is unmatched in the industry. Underlying our efforts is our belief that we must operate as a principled company committed to a code of conduct that is rooted in our Gary Principles and our core values. Our core values are articulated in our S.T.E.E.L. Principles - Safety First, Trust and Respect, Environmentally Friendly Activities, Ethical Behavior, and Lawful Business Conduct. These core values guide U. S. Steel and help support the economic and societal benefits associated with strong domestic manufacturing capabilities, of which steel is a foundational industry.

We are executing on our customer-centric strategy to transform U. S. Steel into a world-competitive, Best of BothSM, steelmaker by combining the best of the integrated steelmaking model with the best of the mini mill steelmaking model. Our strategy will deliver product and process innovation to create unmatched value for our customers while enhancing our earnings profile and delivering long-term cash flow through industry cycles. By offering unparalleled product capabilities, including the “green” steels (steels made with low greenhouse gas emissions intensity) our customers are increasingly demanding, we can achieve world-competitive positioning in strategic, high-margin end markets, and deliver high-quality, sustainable, value-added products and innovative solutions. To get to our Best of Both future, we are investing to create distinct cost and capability advantages, enhancing our focus on operational and commercial excellence and promoting technological innovation, so we can deliver an unmatched value proposition to our customers while creating a more variable cost structure, and lowering the capital intensity of the business.

The diagram below illustrates our world-competitive, Best of Both strategic framework and highlights the key actions to transform our business.

x-20201231_g2.jpg


Over the past several years, we have proactively re-shaped our footprint and transformed our balance sheet. We used the strength and foundation of our business to align our balance sheet with the investment horizon to execute our strategy.

Our strategy is informed by our critical success factors, which are the bedrock of the Best of Both strategy: (1) Move Down the Cost Curve; (2) Win in Strategic Markets; and (3) Move Up the Talent Curve. Several of the strategic projects we are undertaking
4

Table of Contents
are expected to result in operational improvements. Additionally, the enhanced operating model and organizational structure we implemented beginning in 2020 will also position U. S. Steel to lower its structural fixed costs. We are also investing in new technologies to improve our cost position and increase our capabilities, including our acquisition of Big River Steel in January 2021, the completed electric arc furnace (EAF) at Fairfield Tubular Operations and the commissioning of a new Continuous Galvanizing Line for AHSS substrates at our Pro-Tec Coating Company joint venture that incorporates proprietary U. S. Steel technology. We will focus on strategic markets, where there is the greatest opportunity to provide differentiated, innovative and value-added solutions that will help our customers succeed. We know that to accomplish our objectives, we also need to move up the talent curve. We are investing in our employees and providing the training and resources they need to succeed. This will help us reinforce a culture where accountability, fairness and respect are foundational, and high performance and inclusion in all its forms are valued and celebrated. In addition, we are bringing Big River Steel’s focused, innovative, and entrepreneurial mindset into the way we do business. By bringing these two world-class workforces together, with a shared values-based culture, we can create significant value across the enterprise.

2020 was another strategically transformational year despite the challenges presented by the COVID-19 pandemic. On December 8, 2020, we exercised our call option to acquire the remaining equity of Big River Steel. The purchase of Big River Steel closed on January 15, 2021 for $723 million in cash and the assumption of approximately $50 million in liabilities. The successful completion of the acquisition marked a major milestone in our Best of Both strategy. By fully acquiring Big River Steel we have created North America’s only Best of Both steel technology company. Our Best of Both steel technology company combines leading advanced high-strength steel intellectual property with a technologically advanced and low-greenhouse gas emissions mini mill.

On October 26, 2020, we announced the successful start-up of our new, technologically advanced EAF steelmaking facility at our Fairfield, Alabama operations. The EAF is used to produce rounds as substrate for our seamless pipe facility. By insourcing rounds production we expect to structurally improve the Tubular segment's cost position by approximately $90 per seamless ton.

We also announced two significant steps towards the Company’s strategic objective to monetize its iron ore assets. First, on April 30, 2020, we granted Stelco Inc. (Stelco) at a purchase price of $100 million the option to acquire a 25 percent interest in the Company’s Minntac iron ore mining operations for an aggregate purchase price of $600 million. The option can be exercised any time before January 31, 2027 and, upon exercise, Stelco will make an additional payment of $500 million to acquire its 25 percent interest in the new cost-sharing joint venture. This agreement ensures U. S. Steel will continue to be the operator and majority owner of the Minntac mine. We also entered into a seven year agreement to sell significant volumes of iron ore pellets to Stelco. Second, on May 18, 2020, we announced a four-year agreement to sell substantial volumes of quality iron ore pellets to Ontario, Canada based Algoma Steel Inc. The purchase agreement, which runs from 2021 through 2024, provides incremental volume and a new long-term iron ore customer for U. S. Steel’s Minnesota mines.

We also made considerable progress on our commitment to reduce fixed costs by $200 million. We are on-track to achieve this goal by 2022.

Ultimately, we intend to center our North American Flat-Rolled operations to offer customers differentiated products and to deliver highly competitive long-term cash flow generation through higher earnings and lower maintenance capital expenditures.

5

Table of Contents
KEY PERFORMANCE INDICATORS

This section provides an overview of select key performance indicators for U. S. Steel which management and investors use to assess the Company's financial performance. It does not contain all of the information you should consider. Fluctuations for year to year changes are explained in Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations."


x-20201231_g3.jpg
        
The net loss in 2020 reflects a significant decline in demand related to the economic impacts of the COVID-19 pandemic, disruption in the Tubular market that led to oversupply during a time of declining demand and continued high-levels of imports. The decline in demand in the Tubular market was considered a triggering event that led to an impairment of $263 million for our welded tubular asset group. In addition, the Company recognized $138 million of restructuring charges during 2020 to better align its operations with customer demand and reduce fixed costs. See Notes 1 and 25 to the Consolidated Financial Statements for further details.
Our 2019 net loss includes unfavorable restructuring impacts of $275 million for the indefinite idling of certain of our Flat-Rolled facilities, headcount reductions and plant exit costs at USSE and Company-wide headcount reductions. Our financial results were also negatively impacted by lower average realized prices across all of our business segments, significant market challenges in our USSE segment and a $334 million non-cash charge to tax expense that increased the valuation allowance related to our net domestic deferred tax asset.
Our 2018 net earnings include a favorable impact of $374 million due to the reversal of a portion of our deferred tax asset valuation allowance.








6

Table of Contents
x-20201231_g4.jpg

These amounts are derived starting from net (loss) earnings as shown on page 6. For a full reconciliation of adjusted net (loss) earnings see page 17.
The earnings decrease from 2019 to 2020 was primarily due to a significant decline in demand related to the economic impacts of the COVID-19 pandemic, disruption in the Tubular market that led to oversupply during a time of declining demand and continued high-levels of imports.
Earnings decreased from 2018 to 2019 as market conditions in the U.S. weakened in the latter half of 2019 and our USSE segment faced significant market challenges from weakening economic conditions, primarily in the manufacturing sector.



7

Table of Contents
x-20201231_g5.jpg

See reconciliation from diluted net (loss) earnings per share to adjusted diluted net earnings per share on page 18.
8

Table of Contents
x-20201231_g6.jpg

These amounts are derived starting from net (loss) earnings as shown on page 6. For a full reconciliation of adjusted EBITDA see page 19.
In 2020, Flat-Rolled and Tubular EBITDA declined. Flat-Rolled shipments declined due to customer operating restrictions and lower demand as a result of the COVID-19 pandemic. North American steel demand declined dramatically with capacity utilization rates dropping to almost 50% in the second quarter accompanied by significant spot price erosion. In Tubular, the continued disruption in the oil and gas industry, as well as pandemic-related impacts, reduced demand for oil and gas and severely impacted energy prices, creating significant reductions of drilling activity in the U.S.
EBITDA decreased from 2018 to 2019 primarily in our Flat-Rolled and USSE segments. The primary driver of decreased EBITDA in our Flat-Rolled segment was lower average realized prices related to weakening demand in the latter half of 2019. Our USSE segment temporarily idled one blast furnace as it experienced reduced shipment levels and lower average realized prices as a result of significant market challenges from weakening economic conditions, primarily in the manufacturing sector, and continued high levels of imports, coupled with domestic CO2 cost disadvantages compared to imports. Tubular results continued to be negatively impacted by high levels of imports which resulted in lower selling prices.
9

Table of Contents
x-20201231_g7.jpg
The decrease in net sales in 2020 as compared to 2019 was primarily due to lower shipments and lower average realized prices in all of our reportable segments primarily caused by the economic impacts of the COVID-19 pandemic and the disruption in the oil and gas industry.
The decrease in net sales in 2019 as compared to 2018 was primarily due to lower average realized prices in all of our reportable segments and significantly reduced shipments in our USSE segment. Lower average realized prices in our Flat-Rolled and Tubular segments reflect weakening market conditions in the latter half of 2019. Reduced shipment levels and lower average realized prices in our USSE segment were the result of significant market challenges from weakening economic conditions, primarily in the manufacturing sector, and continued high levels of imports, coupled with domestic CO2 cost disadvantages compared to imports.

10

Table of Contents
x-20201231_g8.jpg

In 2020, the positive cash flow from operations was primarily due to the efficient use of working capital partially offset by declining financial performance.
In 2019, the positive cash flow from operations was primarily due to efficient use of working capital.
In 2018, improved financial performance more than offset the investment in working capital.
Our cash conversion cycle was 28, 37 and 24 days for 2018, 2019 and 2020, respectively. See “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations – Liquidity and Capital Resources” for the calculation of our cash conversion cycle.




11

Table of Contents
x-20201231_g9.jpg

The free cash flow shown above was derived starting from cash flow from operations as shown on page 11. For a full reconciliation of free cash flow see page 20.
In 2020, the Company was faced with significant market challenges that resulted in decreased profitability and reduced capital spending to preserve liquidity.
A portion of our cash from operations in 2019 was spent on strategic projects in furtherance of our world-competitive, Best of Both strategy.
Capital expenditures totaled $1.0 billion in 2018 including $335 million on asset revitalization projects that were focused on delivering improvements in safety, quality, delivery and cost for critical assets in our Flat-Rolled segment.

















12

Table of Contents
x-20201231_g10.jpg

Maintaining cash and liquidity to support and enable execution of our Best of Both strategy is an important priority. Despite the economic challenges we faced in 2020, we maintained strong liquidity which enabled the January 2021 purchase of the remaining interest in Big River Steel primarily with cash.
Our liquidity was also strong in 2018 and 2019 and supported our ability to satisfy short-term obligations, fund working capital requirements, and enable execution of key strategic priorities.


13

Table of Contents
x-20201231_g11.jpg

The increase in debt in 2020 was primarily related to the issuance of our 2025 Senior Secured Notes and the Export-Import Credit Agreement and Export Credit Agreement borrowings. These borrowings strengthened our balance sheet and increased liquidity during the COVID-19 pandemic.
The increase in debt in 2019 was primarily related to net drawings that totaled approximately $760 million on our credit facilities, the $350 million issuance of senior convertible notes and the net increase in environmental revenue bonds of $220 million.
Net debt was derived starting from total debt as shown in the full reconciliation on page 20.
The increase in net debt in 2019 was primarily related to the increase in debt described above and the use of funds to purchase our 49.9% interest in Big River Steel, fund the electric arc furnace construction at Fairfield Tubular Operations and finance other capital expenditures.
14

Table of Contents


x-20201231_g12.jpg

The decrease in 2020 net periodic benefit cost from 2019 was primarily due to better than expected 2019 asset performance, lower amortization of prior service costs, lower future healthcare costs and reduced participation in our retiree healthcare plans.
The increase in 2019 net periodic benefit cost from 2018 was mainly due to increased contributions to the Steelworkers' Pension Trust (SPT) in 2019 in accordance with the increase in the contribution rate per hour required under the 2018 Labor Agreements.
For further details, see Note 18 to the Consolidated Financial Statements.
15

Table of Contents
x-20201231_g13.jpg

The funded status of our pension plan improved by $265 million in 2020 primarily due to favorable 2020 asset performance partially offset by a decrease in the discount rate. The funded status of our other post-employment benefits (OPEB) plan improved by $121 million in 2020 primarily due to a decrease in expected future healthcare costs and favorable 2020 asset performance.
At the end of 2020, on a U.S. GAAP basis the funded status was 98% and 115% for our pension and OPEB obligations as compared to a funded status of 93% and 108% at the end of 2019, respectively.
No required contributions to the pension plan are projected within the next 5 years.
For further details, see Note 18 to the Consolidated Financial Statements.







16

Table of Contents
NON-GAAP FINANCIAL MEASURES
Throughout this report, we present EBITDA, adjusted EBITDA, adjusted net (loss) earnings and adjusted net (loss) earnings per diluted share, free cash flow and net debt which are non-GAAP measures, as additional measurements to enhance the understanding of our operating performance, cash flow and financial position and to facilitate comparison with our competitors. See page 3 for an explanation of our use of certain non-GAAP financial measures.
RECONCILIATION TO ADJUSTED NET (LOSS) EARNINGS (a)
Year Ended December 31,
(Dollars in millions)202020192018
Reconciliation to adjusted net (loss) earnings attributable to United States Steel Corporation
Net (loss) earnings attributable to United States Steel Corporation, as reported$(1,165)$(630)$1,115 
Asset impairment charge263 — — 
Restructuring and other charges131 263 — 
Tubular inventory impairment24