Company Quick10K Filing
CenterPoint Energy
Price30.61 EPS1
Shares505 P/E23
MCap15,460 P/FCF14
Net Debt1,411 EBIT908
TEV16,871 TEV/EBIT19
TTM 2019-09-30, in MM, except price, ratios
10-K 2020-12-31 Filed 2021-02-25
10-Q 2020-09-30 Filed 2020-11-05
10-Q 2020-06-30 Filed 2020-08-06
10-Q 2020-03-31 Filed 2020-05-07
10-K 2019-12-31 Filed 2020-02-27
10-Q 2019-09-30 Filed 2019-11-07
10-Q 2019-06-30 Filed 2019-08-07
10-Q 2019-03-31 Filed 2019-05-09
10-K 2018-12-31 Filed 2019-02-28
10-Q 2018-09-30 Filed 2018-11-08
10-Q 2018-06-30 Filed 2018-08-03
10-Q 2018-03-31 Filed 2018-05-04
10-K 2017-12-31 Filed 2018-02-22
10-Q 2017-09-30 Filed 2017-11-03
10-Q 2017-06-30 Filed 2017-08-03
10-Q 2017-03-31 Filed 2017-05-05
10-K 2016-12-31 Filed 2017-02-28
10-Q 2016-09-30 Filed 2016-11-04
10-Q 2016-06-30 Filed 2016-08-05
10-Q 2016-03-31 Filed 2016-05-10
10-K 2015-12-31 Filed 2016-02-26
10-Q 2015-09-30 Filed 2015-11-05
10-Q 2015-06-30 Filed 2015-08-10
10-Q 2015-03-31 Filed 2015-05-11
10-K 2014-12-31 Filed 2015-02-26
10-Q 2014-09-30 Filed 2014-11-05
10-Q 2014-06-30 Filed 2014-08-06
10-Q 2014-03-31 Filed 2014-05-01
10-K 2013-12-31 Filed 2014-02-26
10-Q 2013-09-30 Filed 2013-11-06
10-Q 2013-06-30 Filed 2013-08-01
10-K 2012-12-31 Filed 2013-02-27
10-Q 2012-09-30 Filed 2012-11-07
10-Q 2012-06-30 Filed 2012-08-02
10-Q 2012-03-31 Filed 2012-05-03
10-K 2011-12-31 Filed 2012-02-29
10-Q 2011-09-30 Filed 2011-11-02
10-Q 2011-06-30 Filed 2011-08-04
10-Q 2011-03-31 Filed 2011-05-05
10-K 2010-12-31 Filed 2011-03-01
10-Q 2010-09-30 Filed 2010-10-28
10-Q 2010-06-30 Filed 2010-08-04
10-Q 2010-03-31 Filed 2010-05-05
10-K 2009-12-31 Filed 2010-02-26
8-K 2021-02-19 Officers, Exhibits
8-K 2021-02-16 Other Events, Regulation FD, Exhibits
8-K 2021-02-08 Regulation FD
8-K 2021-02-04 Enter Agreement, Leave Agreement, Off-BS Arrangement, Other Events, Exhibits
8-K 2020-12-23 Other Events
8-K 2020-12-07 Regulation FD, Exhibits
8-K 2020-11-05
8-K 2020-09-30
8-K 2020-09-15
8-K 2020-09-01
8-K 2020-08-06
8-K 2020-08-03
8-K 2020-06-30
8-K 2020-06-01
8-K 2020-05-18
8-K 2020-05-07
8-K 2020-05-06
8-K 2020-04-24
8-K 2020-04-09
8-K 2020-04-01
8-K 2020-03-30
8-K 2020-03-19
8-K 2020-03-06
8-K 2020-02-27
8-K 2020-02-24
8-K 2020-02-19
8-K 2020-02-19
8-K 2020-02-03
8-K 2020-01-21
8-K 2019-12-09
8-K 2019-11-22
8-K 2019-11-07
8-K 2019-10-10
8-K 2019-08-12
8-K 2019-08-12
8-K 2019-08-12
8-K 2019-08-07
8-K 2019-05-15
8-K 2019-05-15
8-K 2019-05-09
8-K 2019-05-09
8-K 2019-04-25
8-K 2019-04-16
8-K 2019-04-05
8-K 2019-04-01
8-K 2019-03-27
8-K 2019-03-20
8-K 2019-03-04
8-K 2019-03-04
8-K 2019-02-28
8-K 2019-02-01
8-K 2019-02-01
8-K 2019-01-30
8-K 2019-01-16
8-K 2018-11-27
8-K 2018-11-08
8-K 2018-10-05
8-K 2018-10-03
8-K 2018-10-03
8-K 2018-10-02
8-K 2018-09-25
8-K 2018-09-24
8-K 2018-09-04
8-K 2018-08-28
8-K 2018-08-22
8-K 2018-08-15
8-K 2018-08-14
8-K 2018-08-03
8-K 2018-06-26
8-K 2018-06-15
8-K 2018-06-12
8-K 2018-05-25
8-K 2018-05-04
8-K 2018-04-26
8-K 2018-04-21
8-K 2018-04-04
8-K 2018-03-16
8-K 2018-03-12
8-K 2018-02-22
8-K 2018-02-13
8-K 2018-01-05
8-K 2018-01-04

CNP 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 Disclosures
Part II
Item 5.Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Item 6. Selected Financial Data (Centerpoint Energy)
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. 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 Accounting Fees and Services
Part IV
Item 15.Exhibits and Financial Statement Schedules
Item 16. Form 10 - K Summary
EX-4.HH cnp_exhibit4hhx12312020.htm
EX-4.II cehe_exhibit4iix12312020.htm
EX-4.JJ cerc_exhibit4jjx12312020.htm
EX-10.H cnp_exhibit10hx12312020.htm
EX-10.Q(12) cnpexhibit10q1212312020.htm
EX-10.Q(13) cnpexhibit10q1312312020.htm
EX-10.R cnp_exhibit10rx12312020.htm
EX-10.S cnp_exhibit10sx12312020.htm
EX-10.T cnpexhibit10t212312020.htm
EX-21 cnp_exhibit21x12312020.htm
EX-23.1.1 cnp_exhibit2311x12312020.htm
EX-23.1.2 cehe_exhibit2312x12312020.htm
EX-23.1.3 cerc_exhibit2313x12312020.htm
EX-23.2 cnp_exhibit232x12312020.htm
EX-31.1.1 cnp_exhibit3111x12312020.htm
EX-31.1.2 cehe_exhibit3112x12312020.htm
EX-31.1.3 cerc_exhibit3113x12312020.htm
EX-31.2.1 cnp_exhibit3121x12312020.htm
EX-31.2.2 cehe_exhibit3122x12312020.htm
EX-31.2.3 cerc_exhibit3123x12312020.htm
EX-32.1.1 cnp_exhibit3211x12312020.htm
EX-32.1.2 cehe_exhibit3212x12312020.htm
EX-32.1.3 cerc_exhibit3213x12312020.htm
EX-32.2.1 cnp_exhibit3221x12312020.htm
EX-32.2.2 cehe_exhibit3222x12312020.htm
EX-32.2.3 cerc_exhibit3223x12312020.htm

CenterPoint Energy Earnings 2020-12-31

Balance SheetIncome StatementCash Flow
35282114702012201420172020
Assets, Equity
3.62.81.91.10.2-0.62012201420172020
Rev, G Profit, Net Income
2.41.81.20.5-0.1-0.72012201420172020
Ops, Inv, Fin

cnp-20201231
000113031012/3112/31/20202020FYfalseTexasCommon Stock, $0.01 par valueCNP0000048732Texas0001042773Non-accelerated FilerDelaware1100011303102020-01-012020-12-310001130310cnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMember2020-01-012020-12-310001130310cnp:NewYorkStockExchangeMembercnp:CommonStock0.01ParValueMember2020-01-012020-12-310001130310cnp:CommonStock0.01ParValueMembercnp:ChicagoStockExchangeMember2020-01-012020-12-310001130310cnp:NewYorkStockExchangeMembercnp:DepositarySharesMember2020-01-012020-12-310001130310cnp:NewYorkStockExchangeMembercnp:A9.15FirstMortgageBondsDue2021Membercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:A6.95GeneralMortgageBondsDue2033Membercnp:NewYorkStockExchangeMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:NewYorkStockExchangeMembercnp:CercCorpMembercnp:A6.625SeniorNotesDue2037Member2020-01-012020-12-31iso4217:USD00011303102020-06-300001130310cnp:HoustonElectricMember2020-06-300001130310cnp:CercCorpMember2020-06-30xbrli:shares00011303102021-02-220001130310cnp:HoustonElectricMember2021-02-220001130310cnp:CercCorpMember2021-02-2200011303102019-01-012019-12-3100011303102018-01-012018-12-310001130310us-gaap:SegmentDiscontinuedOperationsMember2019-01-012019-12-310001130310us-gaap:SegmentDiscontinuedOperationsMember2018-01-012018-12-31iso4217:USDxbrli:shares0001130310us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310001130310us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2019-12-3100011303102020-12-3100011303102019-12-310001130310us-gaap:CumulativePreferredStockMember2019-12-310001130310us-gaap:CumulativePreferredStockMember2020-12-310001130310us-gaap:SeriesAPreferredStockMember2020-12-310001130310us-gaap:SeriesAPreferredStockMember2019-12-310001130310us-gaap:SeriesBPreferredStockMember2020-12-310001130310us-gaap:SeriesBPreferredStockMember2019-12-310001130310us-gaap:SeriesCPreferredStockMember2020-12-310001130310us-gaap:SeriesCPreferredStockMember2019-12-3100011303102018-12-3100011303102017-12-310001130310us-gaap:SeriesCPreferredStockMember2018-12-310001130310us-gaap:SeriesBPreferredStockMember2018-12-310001130310us-gaap:SeriesAPreferredStockMember2018-12-310001130310us-gaap:PreferredStockMember2019-12-310001130310us-gaap:PreferredStockMember2018-12-310001130310us-gaap:PreferredStockMember2017-12-310001130310us-gaap:SeriesAPreferredStockMemberus-gaap:PreferredStockMember2020-01-012020-12-310001130310us-gaap:SeriesAPreferredStockMemberus-gaap:PreferredStockMember2019-01-012019-12-310001130310us-gaap:SeriesAPreferredStockMemberus-gaap:PreferredStockMember2018-01-012018-12-310001130310us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2020-01-012020-12-310001130310us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2019-01-012019-12-310001130310us-gaap:SeriesBPreferredStockMemberus-gaap:PreferredStockMember2018-01-012018-12-310001130310us-gaap:SeriesCPreferredStockMemberus-gaap:PreferredStockMember2020-01-012020-12-310001130310us-gaap:SeriesCPreferredStockMemberus-gaap:PreferredStockMember2019-01-012019-12-310001130310us-gaap:SeriesCPreferredStockMemberus-gaap:PreferredStockMember2018-01-012018-12-310001130310us-gaap:SeriesCPreferredStockMember2020-01-012020-12-310001130310us-gaap:SeriesCPreferredStockMember2019-01-012019-12-310001130310us-gaap:SeriesCPreferredStockMember2018-01-012018-12-310001130310us-gaap:PreferredStockMember2020-12-310001130310us-gaap:CommonStockMember2019-12-310001130310us-gaap:CommonStockMember2018-12-310001130310us-gaap:CommonStockMember2017-12-310001130310us-gaap:CommonStockMember2020-01-012020-12-310001130310us-gaap:CommonStockMember2019-01-012019-12-310001130310us-gaap:CommonStockMember2018-01-012018-12-310001130310us-gaap:CommonStockMember2020-12-310001130310us-gaap:AdditionalPaidInCapitalMember2019-12-310001130310us-gaap:AdditionalPaidInCapitalMember2018-12-310001130310us-gaap:AdditionalPaidInCapitalMember2017-12-310001130310us-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310001130310us-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310001130310us-gaap:AdditionalPaidInCapitalMember2018-01-012018-12-310001130310us-gaap:CommonStockMemberus-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310001130310us-gaap:CommonStockMemberus-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310001130310us-gaap:CommonStockMemberus-gaap:AdditionalPaidInCapitalMember2018-01-012018-12-310001130310us-gaap:AdditionalPaidInCapitalMember2020-12-310001130310us-gaap:RetainedEarningsMember2019-12-310001130310us-gaap:RetainedEarningsMember2018-12-310001130310us-gaap:RetainedEarningsMember2017-12-310001130310us-gaap:RetainedEarningsMember2020-01-012020-12-310001130310us-gaap:RetainedEarningsMember2019-01-012019-12-310001130310us-gaap:RetainedEarningsMember2018-01-012018-12-310001130310us-gaap:SeriesAPreferredStockMemberus-gaap:RetainedEarningsMember2020-01-012020-12-310001130310us-gaap:SeriesAPreferredStockMemberus-gaap:RetainedEarningsMember2019-01-012019-12-310001130310us-gaap:SeriesAPreferredStockMemberus-gaap:RetainedEarningsMember2018-01-012018-12-310001130310us-gaap:SeriesBPreferredStockMemberus-gaap:RetainedEarningsMember2020-01-012020-12-310001130310us-gaap:SeriesBPreferredStockMemberus-gaap:RetainedEarningsMember2019-01-012019-12-310001130310us-gaap:SeriesBPreferredStockMemberus-gaap:RetainedEarningsMember2018-01-012018-12-310001130310us-gaap:SeriesCPreferredStockMemberus-gaap:RetainedEarningsMember2020-01-012020-12-310001130310us-gaap:SeriesCPreferredStockMemberus-gaap:RetainedEarningsMember2019-01-012019-12-310001130310us-gaap:SeriesCPreferredStockMemberus-gaap:RetainedEarningsMember2018-01-012018-12-310001130310us-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201613Member2020-01-012020-12-310001130310us-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201613Member2019-01-012019-12-310001130310us-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201613Member2018-01-012018-12-310001130310us-gaap:AccountingStandardsUpdate201802Memberus-gaap:RetainedEarningsMember2020-01-012020-12-310001130310us-gaap:AccountingStandardsUpdate201802Memberus-gaap:RetainedEarningsMember2019-01-012019-12-310001130310us-gaap:AccountingStandardsUpdate201802Memberus-gaap:RetainedEarningsMember2018-01-012018-12-310001130310us-gaap:RetainedEarningsMember2020-12-310001130310us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001130310us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310001130310us-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310001130310us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001130310us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001130310us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001130310us-gaap:AccountingStandardsUpdate201802Memberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001130310us-gaap:AccountingStandardsUpdate201802Memberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001130310us-gaap:AccountingStandardsUpdate201802Memberus-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001130310us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310001130310cnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:HoustonElectricMember2018-01-012018-12-310001130310us-gaap:VariableInterestEntityPrimaryBeneficiaryMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:VariableInterestEntityPrimaryBeneficiaryMembercnp:HoustonElectricMember2019-12-310001130310cnp:HoustonElectricMember2020-12-310001130310cnp:HoustonElectricMember2019-12-310001130310cnp:HoustonElectricMember2018-12-310001130310cnp:HoustonElectricMember2017-12-310001130310us-gaap:CommonStockMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:CommonStockMembercnp:HoustonElectricMember2018-12-310001130310us-gaap:CommonStockMembercnp:HoustonElectricMember2017-12-310001130310us-gaap:CommonStockMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:AdditionalPaidInCapitalMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:AdditionalPaidInCapitalMembercnp:HoustonElectricMember2018-12-310001130310us-gaap:AdditionalPaidInCapitalMembercnp:HoustonElectricMember2017-12-310001130310us-gaap:AdditionalPaidInCapitalMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:AdditionalPaidInCapitalMembercnp:HoustonElectricMember2019-01-012019-12-310001130310us-gaap:AdditionalPaidInCapitalMembercnp:HoustonElectricMember2018-01-012018-12-310001130310us-gaap:AdditionalPaidInCapitalMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:RetainedEarningsMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:RetainedEarningsMembercnp:HoustonElectricMember2018-12-310001130310us-gaap:RetainedEarningsMembercnp:HoustonElectricMember2017-12-310001130310us-gaap:RetainedEarningsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:RetainedEarningsMembercnp:HoustonElectricMember2019-01-012019-12-310001130310us-gaap:RetainedEarningsMembercnp:HoustonElectricMember2018-01-012018-12-310001130310us-gaap:RetainedEarningsMembercnp:HoustonElectricMember2020-12-310001130310cnp:HoustonElectricMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001130310cnp:HoustonElectricMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310001130310cnp:HoustonElectricMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310001130310cnp:HoustonElectricMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001130310cnp:HoustonElectricMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001130310cnp:HoustonElectricMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001130310cnp:HoustonElectricMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310001130310cnp:CercCorpMember2019-01-012019-12-310001130310cnp:CercCorpMember2018-01-012018-12-310001130310cnp:CercCorpMember2020-12-310001130310cnp:CercCorpMember2019-12-310001130310cnp:CercCorpMember2018-12-310001130310cnp:CercCorpMember2017-12-310001130310cnp:CercCorpMemberus-gaap:CommonStockMember2019-12-310001130310cnp:CercCorpMemberus-gaap:CommonStockMember2018-12-310001130310cnp:CercCorpMemberus-gaap:CommonStockMember2017-12-310001130310cnp:CercCorpMemberus-gaap:CommonStockMember2020-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMember2019-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMember2018-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMember2017-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMemberus-gaap:SegmentDiscontinuedOperationsMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMemberus-gaap:SegmentDiscontinuedOperationsMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMemberus-gaap:SegmentDiscontinuedOperationsMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:AdditionalPaidInCapitalMember2020-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMember2019-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMember2018-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMember2017-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201613Member2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201613Member2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201613Member2018-01-012018-12-310001130310us-gaap:AccountingStandardsUpdate201802Membercnp:CercCorpMemberus-gaap:RetainedEarningsMember2020-01-012020-12-310001130310us-gaap:AccountingStandardsUpdate201802Membercnp:CercCorpMemberus-gaap:RetainedEarningsMember2019-01-012019-12-310001130310us-gaap:AccountingStandardsUpdate201802Membercnp:CercCorpMemberus-gaap:RetainedEarningsMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:RetainedEarningsMember2020-12-310001130310cnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001130310cnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310001130310cnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310001130310cnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001130310us-gaap:AccountingStandardsUpdate201802Membercnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001130310us-gaap:AccountingStandardsUpdate201802Membercnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001130310us-gaap:AccountingStandardsUpdate201802Membercnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-31cnp:state0001130310cnp:CercCorpMembercnp:NaturalGasMember2020-12-310001130310cnp:CercCorpMembercnp:NaturalGasDistributionMember2020-12-31xbrli:pure0001130310cnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:EnableGPLLCMember2020-01-012020-12-310001130310cnp:SeriesAPreferredUnitsMembercnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:InfrastructureServicesDisposalGroupMember2020-01-012020-12-310001130310cnp:EnergyServicesMember2020-01-012020-12-310001130310us-gaap:InterestExpenseMember2020-01-012020-12-310001130310us-gaap:InterestExpenseMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:InterestExpenseMember2020-01-012020-12-310001130310us-gaap:InterestExpenseMember2019-01-012019-12-310001130310us-gaap:InterestExpenseMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:InterestExpenseMember2019-01-012019-12-310001130310us-gaap:InterestExpenseMember2018-01-012018-12-310001130310us-gaap:InterestExpenseMembercnp:HoustonElectricMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:InterestExpenseMember2018-01-012018-12-310001130310us-gaap:OtherIncomeMember2020-01-012020-12-310001130310us-gaap:OtherIncomeMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:OtherIncomeMember2020-01-012020-12-310001130310us-gaap:OtherIncomeMember2019-01-012019-12-310001130310us-gaap:OtherIncomeMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:OtherIncomeMember2019-01-012019-12-310001130310us-gaap:OtherIncomeMember2018-01-012018-12-310001130310us-gaap:OtherIncomeMembercnp:HoustonElectricMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:OtherIncomeMember2018-01-012018-12-310001130310us-gaap:ElectricTransmissionMembersrt:WeightedAverageMember2020-01-012020-12-310001130310us-gaap:ElectricTransmissionAndDistributionMember2020-12-310001130310us-gaap:ElectricTransmissionAndDistributionMember2019-12-310001130310us-gaap:ElectricGenerationEquipmentMembersrt:WeightedAverageMember2020-01-012020-12-310001130310us-gaap:ElectricGenerationEquipmentMember2020-12-310001130310us-gaap:ElectricGenerationEquipmentMember2019-12-310001130310us-gaap:GasDistributionEquipmentMembersrt:WeightedAverageMember2020-01-012020-12-310001130310us-gaap:GasDistributionEquipmentMember2020-12-310001130310us-gaap:GasDistributionEquipmentMember2019-12-310001130310srt:WeightedAverageMemberus-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2020-01-012020-12-310001130310us-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2020-12-310001130310us-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2019-12-310001130310us-gaap:ElectricTransmissionMembersrt:WeightedAverageMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:ElectricTransmissionMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:ElectricTransmissionMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:ElectricDistributionMembersrt:WeightedAverageMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:ElectricDistributionMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:ElectricDistributionMembercnp:HoustonElectricMember2019-12-310001130310srt:WeightedAverageMemberus-gaap:OtherCapitalizedPropertyPlantAndEquipmentMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:OtherCapitalizedPropertyPlantAndEquipmentMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:OtherCapitalizedPropertyPlantAndEquipmentMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:GasDistributionEquipmentMembercnp:CercCorpMembersrt:WeightedAverageMember2020-01-012020-12-310001130310us-gaap:GasDistributionEquipmentMembercnp:CercCorpMember2020-12-310001130310us-gaap:GasDistributionEquipmentMembercnp:CercCorpMember2019-12-310001130310cnp:CercCorpMembersrt:WeightedAverageMemberus-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2019-12-310001130310cnp:SIGECOMember2020-12-310001130310cnp:VectrenMember2019-01-012019-12-310001130310cnp:VectrenMember2019-12-310001130310cnp:StubperiodMembercnp:VectrenMember2019-01-012019-12-310001130310cnp:VectrenacquisitionMember2019-12-310001130310cnp:VectrenacquisitionMember2019-01-012019-12-310001130310cnp:OperationAndMaintenanceExpenseMembercnp:VectrenMember2019-01-012019-03-310001130310cnp:OperationAndMaintenanceExpenseMembercnp:VectrenMember2019-01-012019-12-310001130310cnp:OperationandmaintenanceagreementsMembercnp:VectrenMember2020-01-012020-12-310001130310us-gaap:CustomerRelationshipsMembercnp:VectrenMember2020-01-012020-12-310001130310us-gaap:CustomerContractsMembercnp:VectrenMember2020-01-012020-12-310001130310cnp:VectrenMemberus-gaap:TradeNamesMember2020-01-012020-12-310001130310cnp:VectrenMember2020-01-012020-12-310001130310cnp:OperationandmaintenanceagreementsandconstructionbacklogMemberus-gaap:CostOfSalesMembercnp:VectrenMember2019-01-012019-12-310001130310cnp:DepreciationandamortizationexpenseMembercnp:CustomerrelationshipsandtradenamesMembercnp:VectrenMember2019-01-012019-12-310001130310cnp:VectrenMember2018-01-012018-12-310001130310srt:ProFormaMembercnp:VectrenMembercnp:VectrenacquisitionMember2019-01-012019-12-310001130310srt:ProFormaMembercnp:VectrenMembercnp:VectrenacquisitionMember2018-01-012018-12-310001130310cnp:OperationAndMaintenanceExpenseMembercnp:VectrenMember2020-01-012020-12-310001130310cnp:UtilitypipelineconstructioncompanyMember2020-12-310001130310cnp:UtilitypipelineconstructioncompanyMember2020-01-012020-12-310001130310cnp:InfrastructureServicesDisposalGroupMember2020-04-092020-04-090001130310cnp:InfrastructureServicesDisposalGroupMemberus-gaap:SubsequentEventMember2021-01-310001130310cnp:InfrastructureServicesDisposalGroupMember2020-12-310001130310cnp:EnergyServicesDisposalGroupMember2020-01-012020-12-310001130310cnp:EnergyServicesDisposalGroupMember2020-06-012020-06-010001130310cnp:EnergyServicesDisposalGroupMember2020-12-310001130310cnp:EnergyServicesDisposalGroupMembercnp:CercCorpMember2020-12-310001130310cnp:EnergyServicesDisposalGroupMembercnp:CercCorpMember2020-01-012020-12-310001130310cnp:InfrastructureServicesDisposalGroupMember2019-12-310001130310cnp:EnergyServicesDisposalGroupMember2019-12-310001130310cnp:EnergyServicesDisposalGroupMembercnp:CercCorpMember2019-12-310001130310cnp:InfrastructureServicesDisposalGroupMember2019-01-012019-12-310001130310cnp:EnergyServicesDisposalGroupMember2019-01-012019-12-310001130310cnp:EnergyServicesDisposalGroupMember2018-01-012018-12-310001130310cnp:EnergyServicesDisposalGroupMembercnp:CercCorpMember2019-01-012019-12-310001130310cnp:EnergyServicesDisposalGroupMembercnp:CercCorpMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:DiscontinuedOperationsDisposedOfByMeansOtherThanSaleSpinoffMember2018-01-012018-12-310001130310cnp:InfrastructureServicesDisposalGroupMembercnp:CercCorpMember2020-01-012020-12-310001130310cnp:InfrastructureServicesDisposalGroupMembercnp:CercCorpMember2019-01-012019-12-310001130310us-gaap:ReportableSubsegmentsMembercnp:ElectricMember2020-01-012020-12-310001130310cnp:NaturalGasMemberus-gaap:ReportableSubsegmentsMember2020-01-012020-12-310001130310us-gaap:CorporateAndOtherMemberus-gaap:ReportableSubsegmentsMember2020-01-012020-12-310001130310us-gaap:ReportableSubsegmentsMembercnp:ElectricMember2019-01-012019-12-310001130310cnp:NaturalGasMemberus-gaap:ReportableSubsegmentsMember2019-01-012019-12-310001130310us-gaap:CorporateAndOtherMemberus-gaap:ReportableSubsegmentsMember2019-01-012019-12-310001130310us-gaap:ReportableSubsegmentsMembercnp:ElectricMember2018-01-012018-12-310001130310cnp:NaturalGasMemberus-gaap:ReportableSubsegmentsMember2018-01-012018-12-310001130310us-gaap:CorporateAndOtherMemberus-gaap:ReportableSubsegmentsMember2018-01-012018-12-310001130310cnp:ElectricTransmissionDistributionMemberus-gaap:ReportableSubsegmentsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:ElectricTransmissionDistributionMemberus-gaap:ReportableSubsegmentsMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:ElectricTransmissionDistributionMemberus-gaap:ReportableSubsegmentsMembercnp:HoustonElectricMember2018-01-012018-12-310001130310cnp:CercCorpMembercnp:NaturalGasMemberus-gaap:ReportableSubsegmentsMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:NaturalGasMemberus-gaap:ReportableSubsegmentsMember2019-01-012019-12-310001130310cnp:CercCorpMembercnp:NaturalGasMemberus-gaap:ReportableSubsegmentsMember2018-01-012018-12-3100011303102021-01-01us-gaap:CorporateAndOtherMember2020-12-3100011303102022-01-01us-gaap:CorporateAndOtherMember2020-12-310001130310us-gaap:CorporateAndOtherMember2020-12-3100011303102021-01-012020-12-3100011303102022-01-012020-12-310001130310us-gaap:AccountingStandardsUpdate201613Member2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:AccountingStandardsUpdate201613Member2020-01-012020-12-310001130310us-gaap:AccountingStandardsUpdate201613Membercnp:EnergyServicesMember2020-01-012020-12-310001130310cnp:ElectricMember2019-12-310001130310cnp:ElectricMember2020-01-012020-12-310001130310cnp:ElectricMember2020-12-310001130310cnp:NaturalGasMember2019-12-310001130310cnp:NaturalGasMember2020-01-012020-12-310001130310cnp:NaturalGasMember2020-12-310001130310us-gaap:CorporateAndOtherMember2019-12-310001130310us-gaap:CorporateAndOtherMember2020-01-012020-12-310001130310us-gaap:SegmentContinuingOperationsMember2020-01-012020-12-310001130310cnp:IndianaElectricIntegratedMember2020-01-012020-12-310001130310cnp:IndianaElectricIntegratedMember2020-03-310001130310us-gaap:CustomerRelationshipsMember2020-12-310001130310us-gaap:CustomerRelationshipsMember2019-12-310001130310us-gaap:TradeNamesMember2020-12-310001130310us-gaap:TradeNamesMember2019-12-310001130310us-gaap:OrderOrProductionBacklogMember2020-12-310001130310us-gaap:OrderOrProductionBacklogMember2019-12-310001130310cnp:OperationandmaintenanceagreementsMember2020-12-310001130310cnp:OperationandmaintenanceagreementsMember2019-12-310001130310us-gaap:OtherIntangibleAssetsMember2020-12-310001130310us-gaap:OtherIntangibleAssetsMember2019-12-310001130310cnp:DepreciationandamortizationexpenseMember2020-01-012020-12-310001130310cnp:DepreciationandamortizationexpenseMember2019-01-012019-12-310001130310cnp:DepreciationandamortizationexpenseMember2018-01-012018-12-310001130310us-gaap:CostOfSalesMember2020-01-012020-12-310001130310us-gaap:CostOfSalesMember2019-01-012019-12-310001130310us-gaap:CostOfSalesMember2018-01-012018-12-310001130310cnp:DepreciationandamortizationexpenseMembercnp:VectrenMember2020-01-012020-12-310001130310us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2020-12-310001130310cnp:HoustonElectricMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2020-12-310001130310cnp:CercCorpMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2020-12-310001130310us-gaap:PensionAndOtherPostretirementPlansCostsMember2020-12-310001130310us-gaap:PensionAndOtherPostretirementPlansCostsMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:PensionAndOtherPostretirementPlansCostsMember2020-12-310001130310cnp:HurricaneHarveyMember2020-12-310001130310cnp:HurricaneHarveyMembercnp:HoustonElectricMember2020-12-310001130310cnp:HurricaneHarveyMembercnp:CercCorpMember2020-12-310001130310cnp:HurricaneLauraMember2020-12-310001130310cnp:HurricaneLauraMembercnp:HoustonElectricMember2020-12-310001130310cnp:HurricaneLauraMembercnp:CercCorpMember2020-12-310001130310cnp:AmountsrelatedtoTCJAMember2020-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:HoustonElectricMember2020-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:CercCorpMember2020-12-310001130310cnp:ReliefProgramIncrementalCostsCOVID19Member2020-12-310001130310cnp:ReliefProgramIncrementalCostsCOVID19Membercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMembercnp:ReliefProgramIncrementalCostsCOVID19Member2020-12-310001130310us-gaap:AssetRetirementObligationCostsMember2020-12-310001130310cnp:HoustonElectricMemberus-gaap:AssetRetirementObligationCostsMember2020-12-310001130310cnp:CercCorpMemberus-gaap:AssetRetirementObligationCostsMember2020-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-12-310001130310us-gaap:OtherCurrentLiabilitiesMember2020-12-310001130310cnp:HoustonElectricMemberus-gaap:OtherCurrentLiabilitiesMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherCurrentLiabilitiesMember2020-12-310001130310cnp:AmountsrelatedtoTCJAMember2020-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:HoustonElectricMember2020-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:CercCorpMember2020-12-310001130310us-gaap:RemovalCostsMember2020-12-310001130310us-gaap:RemovalCostsMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:RemovalCostsMember2020-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-12-310001130310cnp:HoustonElectricMemberus-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-12-310001130310us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2019-12-310001130310cnp:HoustonElectricMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2019-12-310001130310cnp:CercCorpMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2019-12-310001130310us-gaap:PensionAndOtherPostretirementPlansCostsMember2019-12-310001130310us-gaap:PensionAndOtherPostretirementPlansCostsMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:PensionAndOtherPostretirementPlansCostsMember2019-12-310001130310us-gaap:HurricaneMember2019-12-310001130310us-gaap:HurricaneMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:HurricaneMember2019-12-310001130310cnp:AmountsrelatedtoTCJAMember2019-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:HoustonElectricMember2019-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:CercCorpMember2019-12-310001130310us-gaap:AssetRetirementObligationCostsMember2019-12-310001130310cnp:HoustonElectricMemberus-gaap:AssetRetirementObligationCostsMember2019-12-310001130310cnp:CercCorpMemberus-gaap:AssetRetirementObligationCostsMember2019-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMember2019-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherRegulatoryAssetsLiabilitiesMember2019-12-310001130310us-gaap:OtherCurrentLiabilitiesMember2019-12-310001130310cnp:HoustonElectricMemberus-gaap:OtherCurrentLiabilitiesMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherCurrentLiabilitiesMember2019-12-310001130310cnp:AmountsrelatedtoTCJAMember2019-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:HoustonElectricMember2019-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:CercCorpMember2019-12-310001130310us-gaap:RemovalCostsMember2019-12-310001130310us-gaap:RemovalCostsMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:RemovalCostsMember2019-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMember2019-12-310001130310cnp:HoustonElectricMemberus-gaap:OtherRegulatoryAssetsLiabilitiesMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherRegulatoryAssetsLiabilitiesMember2019-12-310001130310cnp:AmountsrelatedtoTCJAMember2020-01-012020-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:AmountsrelatedtoTCJAMembercnp:CercCorpMember2020-01-012020-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-01-012020-12-310001130310us-gaap:OtherRegulatoryAssetsLiabilitiesMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-01-012020-12-310001130310cnp:CenterPointEnergyHoustonElectric2019RateCaseMember2019-04-052019-04-050001130310cnp:HoustonelectricstipulationandsettlementagreementMember2020-01-232020-01-230001130310cnp:HoustonelectricstipulationandsettlementagreementMembercnp:HoustonElectricMember2020-01-232020-01-230001130310cnp:HoustonelectricstipulationandsettlementagreementMember2020-01-230001130310cnp:RatecaseexpenseMembercnp:HoustonelectricstipulationandsettlementagreementMember2019-12-310001130310cnp:PublicUtilityCommissionofTexasMember2020-12-310001130310cnp:PublicUtilityCommissionofTexasMembercnp:HoustonElectricMember2020-12-310001130310cnp:PublicUtilityCommissionofTexasMembercnp:HoustonElectricMember2020-04-130001130310cnp:PublicUtilityCommissionofTexasMember2020-04-130001130310cnp:OperationAndMaintenanceExpenseMember2020-01-012020-12-310001130310cnp:OperationAndMaintenanceExpenseMember2019-01-012019-12-310001130310cnp:OperationAndMaintenanceExpenseMember2018-01-012018-12-310001130310us-gaap:PerformanceSharesMember2019-12-310001130310us-gaap:PerformanceSharesMember2020-01-012020-12-310001130310us-gaap:PerformanceSharesMember2020-12-310001130310cnp:StockAwardsMember2019-12-310001130310cnp:StockAwardsMember2020-01-012020-12-310001130310cnp:StockAwardsMember2020-12-310001130310us-gaap:PerformanceSharesMember2019-01-012019-12-310001130310us-gaap:PerformanceSharesMember2018-01-012018-12-310001130310cnp:StockAwardsMember2019-01-012019-12-310001130310cnp:StockAwardsMember2018-01-012018-12-310001130310cnp:PerformanceandStockAwardsMember2020-12-310001130310cnp:PerformanceandStockAwardsMember2020-01-012020-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:OperationAndMaintenanceExpenseMember2020-01-012020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:OperationAndMaintenanceExpenseMember2019-01-012019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:OperationAndMaintenanceExpenseMember2018-01-012018-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherNonoperatingIncomeExpenseMember2020-01-012020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherNonoperatingIncomeExpenseMember2019-01-012019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherNonoperatingIncomeExpenseMember2018-01-012018-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2018-01-012018-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2018-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2019-12-312019-12-310001130310us-gaap:PensionPlansDefinedBenefitMember2018-12-312018-12-310001130310us-gaap:OtherPensionPlansDefinedBenefitMember2020-12-310001130310us-gaap:OtherPensionPlansDefinedBenefitMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-01-012018-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-01-012018-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2018-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-312019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2019-12-312019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-312019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-12-312018-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2018-12-312018-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-12-312018-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2019-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2020-01-012020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2020-01-012020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2019-01-012019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMember2019-01-012019-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MinimumMembercnp:USEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MaximumMembercnp:USEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MinimumMembercnp:InternationalDevelopedMarketEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MaximumMembercnp:InternationalDevelopedMarketEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MinimumMemberus-gaap:RealEstateFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MaximumMemberus-gaap:RealEstateFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MinimumMembercnp:FixedIncomeMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MaximumMembercnp:FixedIncomeMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MinimumMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembersrt:MaximumMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CashAndCashEquivalentsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CashAndCashEquivalentsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMembercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMembercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CorporateDebtSecuritiesInvestmentGradeOrAboveMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMembercnp:USEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membercnp:USEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membercnp:USEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:USEquityMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMembercnp:USEquityMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membercnp:USEquityMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membercnp:USEquityMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:USEquityMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMembercnp:CashReceivedAsCollateralMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membercnp:CashReceivedAsCollateralMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membercnp:CashReceivedAsCollateralMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CashReceivedAsCollateralMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMembercnp:CashReceivedAsCollateralMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membercnp:CashReceivedAsCollateralMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membercnp:CashReceivedAsCollateralMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CashReceivedAsCollateralMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001130310us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001130310us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001130310us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001130310us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:InternationalEquityMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:InternationalEquityMembercnp:CommonCollectiveTrustFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:InternationalEquityMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:InternationalEquityMembercnp:CommonCollectiveTrustFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMembercnp:USEquityMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMembercnp:USEquityMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMemberus-gaap:RealEstateFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMemberus-gaap:RealEstateFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMemberus-gaap:RealEstateFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMemberus-gaap:RealEstateFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMemberus-gaap:FixedIncomeFundsMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CommonCollectiveTrustFundsMemberus-gaap:FixedIncomeFundsMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:USEquityMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:USEquityMembercnp:HoustonElectricMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:USEquityMember2020-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:InternationalDevelopedMarketEquityMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:InternationalDevelopedMarketEquityMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:InternationalDevelopedMarketEquityMembercnp:HoustonElectricMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:InternationalDevelopedMarketEquityMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:InternationalDevelopedMarketEquityMember2020-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:InternationalDevelopedMarketEquityMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:FixedIncomeMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:FixedIncomeMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:HoustonElectricMembercnp:FixedIncomeMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:HoustonElectricMembercnp:FixedIncomeMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMembercnp:FixedIncomeMember2020-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:FixedIncomeMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMemberus-gaap:CashAndCashEquivalentsMembercnp:HoustonElectricMember2020-12-310001130310srt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MinimumMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310cnp:CercCorpMembersrt:MaximumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMember2020-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembercnp:USEquityMemberus-gaap:EquityFundsMember2019-12-310001130310cnp:InternationalEquityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310cnp:InternationalEquityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2020-12-310001130310cnp:InternationalEquityMembercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310001130310cnp:InternationalEquityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310cnp:InternationalEquityMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMembercnp:HoustonElectricMember2019-12-310001130310cnp:InternationalEquityMembercnp:CercCorpMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CercCorpMember2020-01-012020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:PensionPlansDefinedBenefitMembercnp:CercCorpMember2020-12-310001130310us-gaap:OtherPensionPlansDefinedBenefitMember2020-01-012020-12-310001130310us-gaap:OtherPensionPlansDefinedBenefitMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPensionPlansDefinedBenefitMember2020-01-012020-12-310001130310us-gaap:OtherPensionPlansDefinedBenefitMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPensionPlansDefinedBenefitMember2020-12-310001130310us-gaap:CommonStockMembercnp:CenterpointEnergyMember2020-12-310001130310us-gaap:CommonStockMembercnp:CenterpointEnergyMember2020-01-012020-12-310001130310cnp:BenefitObligationMember2020-12-310001130310cnp:BenefitObligationMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMembercnp:BenefitObligationMember2020-12-310001130310cnp:BenefitObligationMember2019-12-310001130310cnp:BenefitObligationMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMembercnp:BenefitObligationMember2019-12-31cnp:salary_severance_benefits0001130310us-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMay2023Member2020-01-012020-12-310001130310us-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMay2023Membercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMay2023Member2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMay2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMay2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMay2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310us-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMarch2021Member2020-01-012020-12-310001130310us-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMarch2021Membercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInMarch2021Member2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInApril2025Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInApril2025Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInApril2025Membercnp:CercCorpMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringDecember2023Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringDecember2023Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringDecember2023Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInDecember2025Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInDecember2025Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInDecember2025Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinJune2022Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinJune2022Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinJune2022Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInJuly2022Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInJuly2022Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringInJuly2022Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringJune2022AdditionalMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringJune2022AdditionalMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjectToCollectiveBargainingArrangementsExpiringJune2022AdditionalMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinSeptember2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinSeptember2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinSeptember2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinOctober2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310cnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinOctober2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:WorkforceSubjecttoCollectiveBargainingArrangementsExpiringinOctober2021Memberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310us-gaap:WorkforceSubjectToCollectiveBargainingArrangementsMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310us-gaap:WorkforceSubjectToCollectiveBargainingArrangementsMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:WorkforceSubjectToCollectiveBargainingArrangementsMemberus-gaap:LaborForceConcentrationRiskMembercnp:EmployeesSubjectToCollectiveBargainingAgreementsMember2020-01-012020-12-310001130310us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:InterestRateContractMember2020-12-310001130310us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:InterestRateContractMember2019-12-310001130310cnp:CurrentLiabilitiesMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2020-12-310001130310cnp:CurrentLiabilitiesMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2019-12-310001130310us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2020-12-310001130310us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMember2019-12-310001130310us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:InterestRateContractMemberus-gaap:NondesignatedMember2020-12-310001130310us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:InterestRateContractMemberus-gaap:NondesignatedMember2019-12-310001130310cnp:CurrentLiabilitiesMembercnp:IDSDerivativeMemberus-gaap:NondesignatedMember2020-12-310001130310cnp:CurrentLiabilitiesMembercnp:IDSDerivativeMemberus-gaap:NondesignatedMember2019-12-310001130310cnp:IDSDerivativeMemberus-gaap:NonoperatingIncomeExpenseMember2020-01-012020-12-310001130310cnp:IDSDerivativeMemberus-gaap:NonoperatingIncomeExpenseMember2019-01-012019-12-310001130310cnp:IDSDerivativeMemberus-gaap:NonoperatingIncomeExpenseMember2018-01-012018-12-310001130310us-gaap:NonoperatingIncomeExpenseMemberus-gaap:InterestRateContractMember2020-01-012020-12-310001130310us-gaap:NonoperatingIncomeExpenseMemberus-gaap:InterestRateContractMember2019-01-012019-12-310001130310us-gaap:NonoperatingIncomeExpenseMemberus-gaap:InterestRateContractMember2018-01-012018-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel1Member2020-12-310001130310us-gaap:FairValueInputsLevel2Member2020-12-310001130310us-gaap:FairValueInputsLevel3Member2020-12-310001130310us-gaap:FairValueInputsLevel1Member2019-12-310001130310us-gaap:FairValueInputsLevel2Member2019-12-310001130310us-gaap:FairValueInputsLevel3Member2019-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310cnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310cnp:IDSDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:EnergyRelatedDerivativeMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueMeasurementsRecurringMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:HoustonElectricMember2020-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:HoustonElectricMember2019-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310cnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310cnp:CercCorpMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:CercCorpMember2020-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:CercCorpMember2020-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:CercCorpMember2020-12-310001130310us-gaap:FairValueInputsLevel1Membercnp:CercCorpMember2019-12-310001130310us-gaap:FairValueInputsLevel2Membercnp:CercCorpMember2019-12-310001130310us-gaap:FairValueInputsLevel3Membercnp:CercCorpMember2019-12-310001130310cnp:CommonUnitsMembercnp:EnableMidstreamPartnersMember2020-04-012020-04-010001130310cnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:EnableMidstreamPartnersMember2020-03-310001130310cnp:EnergyServicesMember2020-12-310001130310us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310001130310us-gaap:CarryingReportedAmountFairValueDisclosureMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310001130310us-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310001130310us-gaap:CarryingReportedAmountFairValueDisclosureMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310001130310us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310001130310us-gaap:EstimateOfFairValueFairValueDisclosureMembercnp:HoustonElectricMember2020-12-310001130310cnp:CercCorpMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310001130310us-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001130310us-gaap:EstimateOfFairValueFairValueDisclosureMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001130310cnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:NonutilityInvestmentsMember2020-12-310001130310cnp:ProlianceHoldingsLLCMember2019-12-310001130310cnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:EnableMidstreamPartnersMember2019-01-012019-12-310001130310cnp:EnableMidstreamPartnersMember2018-01-012018-12-310001130310cnp:ProlianceHoldingsLLCMember2020-01-012020-12-310001130310cnp:ProlianceHoldingsLLCMember2019-01-012019-12-310001130310cnp:ProlianceHoldingsLLCMember2018-01-012018-12-310001130310us-gaap:CommonStockMembercnp:EnableMidstreamPartnersMember2020-12-310001130310us-gaap:SeriesAPreferredStockMembercnp:EnableMidstreamPartnersMember2020-12-310001130310us-gaap:CommonStockMembercnp:EnableMidstreamPartnersMember2019-12-310001130310us-gaap:SeriesAPreferredStockMembercnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:OGEMembercnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:OGEMemberus-gaap:CommonStockMembercnp:EnableMidstreamPartnersMember2020-12-310001130310us-gaap:SeriesAPreferredStockMembercnp:OGEMembercnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:OGEMembercnp:EnableMidstreamPartnersMember2019-01-012019-12-310001130310cnp:OGEMemberus-gaap:CommonStockMembercnp:EnableMidstreamPartnersMember2019-12-310001130310us-gaap:SeriesAPreferredStockMembercnp:OGEMembercnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:PublicunitholdersMembercnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:PublicunitholdersMemberus-gaap:CommonStockMembercnp:EnableMidstreamPartnersMember2020-12-310001130310us-gaap:SeriesAPreferredStockMembercnp:PublicunitholdersMembercnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:PublicunitholdersMembercnp:EnableMidstreamPartnersMember2019-01-012019-12-310001130310cnp:PublicunitholdersMemberus-gaap:CommonStockMembercnp:EnableMidstreamPartnersMember2019-12-310001130310us-gaap:SeriesAPreferredStockMembercnp:PublicunitholdersMembercnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:OGEMember2020-01-012020-12-310001130310cnp:EnableGPLLCMembercnp:CenterpointEnergyMember2020-01-012020-12-310001130310cnp:OGEMembercnp:EnableGPLLCMember2020-01-012020-12-310001130310srt:MaximumMembercnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:EnableMidstreamPartnersMemberus-gaap:CommonStockMember2020-01-012020-12-310001130310cnp:EnableMidstreamPartnersMemberus-gaap:CommonStockMember2019-01-012019-12-310001130310cnp:EnableMidstreamPartnersMemberus-gaap:CommonStockMember2018-01-012018-12-310001130310cnp:EnableMidstreamPartnersMemberus-gaap:PreferredStockMember2020-01-012020-12-310001130310cnp:EnableMidstreamPartnersMemberus-gaap:PreferredStockMember2019-01-012019-12-310001130310cnp:EnableMidstreamPartnersMemberus-gaap:PreferredStockMember2018-01-012018-12-310001130310us-gaap:SubsequentEventMember2021-02-180001130310cnp:NaturalGasExpensesMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:NaturalGasExpensesMembercnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:NaturalGasExpensesMembercnp:EnableMidstreamPartnersMember2019-01-012019-12-310001130310cnp:NaturalGasExpensesMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2019-01-012019-12-310001130310cnp:NaturalGasExpensesMembercnp:EnableMidstreamPartnersMember2018-01-012018-12-310001130310cnp:NaturalGasExpensesMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2018-01-012018-12-310001130310cnp:TransitionalServiceMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:TransitionalServiceMembercnp:EnableMidstreamPartnersMember2020-01-012020-12-310001130310cnp:TransitionalServiceMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2019-01-012019-12-310001130310cnp:TransitionalServiceMembercnp:EnableMidstreamPartnersMember2019-01-012019-12-310001130310cnp:TransitionalServiceMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2018-01-012018-12-310001130310cnp:TransitionalServiceMembercnp:EnableMidstreamPartnersMember2018-01-012018-12-310001130310cnp:NaturalGasExpensesMembercnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:NaturalGasExpensesMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:NaturalGasExpensesMembercnp:CercCorpMembercnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:NaturalGasExpensesMembercnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:TransitionalServiceMembercnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:CercCorpMembercnp:EnableMidstreamPartnersMember2020-12-310001130310cnp:TransitionalServiceMembercnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:CercCorpMembercnp:EnableMidstreamPartnersMember2019-12-310001130310cnp:ATTCommonMember2020-12-310001130310cnp:ATTCommonMember2019-12-310001130310cnp:CharterCommonMember2020-12-310001130310cnp:CharterCommonMember2019-12-310001130310cnp:SubordinatedDebtZENSMember2020-12-310001130310cnp:SubordinatedDebtZENSMember2020-01-012020-12-310001130310cnp:SubordinatedDebtZENSMembercnp:ATTCommonMember2020-12-310001130310cnp:SubordinatedDebtZENSMembercnp:ATTCommonMember2019-12-310001130310cnp:CharterCommonMembercnp:SubordinatedDebtZENSMember2020-12-310001130310cnp:CharterCommonMembercnp:SubordinatedDebtZENSMember2019-12-310001130310cnp:TWSecuritiesMember2020-12-310001130310cnp:TWSecuritiesMember2017-12-310001130310cnp:DebtComponentOfZENSMember2017-12-310001130310cnp:DerivativeComponentOfZENSMember2017-12-310001130310cnp:TWSecuritiesMember2018-01-012018-12-310001130310cnp:DebtComponentOfZENSMember2018-01-012018-12-310001130310cnp:DerivativeComponentOfZENSMember2018-01-012018-12-310001130310cnp:TWSecuritiesMember2018-12-310001130310cnp:DebtComponentOfZENSMember2018-12-310001130310cnp:DerivativeComponentOfZENSMember2018-12-310001130310cnp:TWSecuritiesMember2019-01-012019-12-310001130310cnp:DebtComponentOfZENSMember2019-01-012019-12-310001130310cnp:DerivativeComponentOfZENSMember2019-01-012019-12-310001130310cnp:TWSecuritiesMember2019-12-310001130310cnp:DebtComponentOfZENSMember2019-12-310001130310cnp:DerivativeComponentOfZENSMember2019-12-310001130310cnp:TWSecuritiesMember2020-01-012020-12-310001130310cnp:DebtComponentOfZENSMember2020-01-012020-12-310001130310cnp:DerivativeComponentOfZENSMember2020-01-012020-12-310001130310cnp:DebtComponentOfZENSMember2020-12-310001130310cnp:DerivativeComponentOfZENSMember2020-12-310001130310us-gaap:CommonStockMember2020-12-102020-12-100001130310us-gaap:CommonStockMember2020-10-292020-10-290001130310us-gaap:CommonStockMembercnp:ThirdQuarter2020Member2020-07-292020-07-290001130310us-gaap:CommonStockMember2020-07-292020-07-290001130310us-gaap:CommonStockMembercnp:SecondQuarter2020Member2020-04-242020-04-240001130310us-gaap:CommonStockMember2020-04-242020-04-240001130310us-gaap:CommonStockMembercnp:FirstQuarter2020Member2020-02-032020-02-030001130310us-gaap:CommonStockMember2020-02-032020-02-030001130310us-gaap:CommonStockMember2020-01-012020-12-310001130310us-gaap:CommonStockMember2019-10-172019-10-170001130310us-gaap:CommonStockMember2019-07-312019-07-310001130310us-gaap:CommonStockMember2019-04-252019-04-250001130310us-gaap:CommonStockMember2019-01-012019-12-310001130310us-gaap:CommonStockMember2018-12-122018-12-120001130310us-gaap:CommonStockMember2018-10-232018-10-230001130310us-gaap:CommonStockMember2018-07-262018-07-260001130310us-gaap:CommonStockMember2018-04-262018-04-260001130310us-gaap:CommonStockMember2018-01-012018-12-310001130310cnp:PreviousDividendorDistributionMemberus-gaap:CommonStockMember2020-04-012020-04-010001130310cnp:RevisedDividendorDistributionMemberus-gaap:CommonStockMember2020-04-012020-04-010001130310us-gaap:SeriesAPreferredStockMembercnp:ThirdQuarter2020Member2020-12-102020-12-100001130310us-gaap:SeriesAPreferredStockMember2020-12-102020-12-100001130310us-gaap:SeriesAPreferredStockMembercnp:ThirdQuarter2020Member2020-07-292020-07-290001130310us-gaap:SeriesAPreferredStockMember2020-07-292020-07-290001130310us-gaap:SeriesAPreferredStockMembercnp:FirstQuarter2020Member2020-02-032020-02-030001130310us-gaap:SeriesAPreferredStockMember2020-02-032020-02-030001130310us-gaap:SeriesAPreferredStockMember2020-01-012020-12-310001130310us-gaap:SeriesAPreferredStockMember2019-07-312019-07-310001130310us-gaap:SeriesAPreferredStockMember2019-01-012019-12-310001130310us-gaap:SeriesAPreferredStockMember2018-12-122018-12-120001130310us-gaap:SeriesAPreferredStockMember2018-01-012018-12-310001130310us-gaap:SeriesBPreferredStockMember2020-12-102020-12-100001130310us-gaap:SeriesBPreferredStockMember2020-10-292020-10-290001130310us-gaap:SeriesBPreferredStockMembercnp:ThirdQuarter2020Member2020-07-292020-07-290001130310us-gaap:SeriesBPreferredStockMembercnp:FirstQuarter2020Member2020-04-242020-04-240001130310us-gaap:SeriesBPreferredStockMembercnp:SecondQuarter2020Member2020-04-242020-04-240001130310us-gaap:SeriesBPreferredStockMembercnp:FirstQuarter2020Member2020-02-032020-02-030001130310us-gaap:SeriesBPreferredStockMember2020-01-012020-12-310001130310us-gaap:SeriesBPreferredStockMember2019-10-172019-10-170001130310us-gaap:SeriesBPreferredStockMember2019-07-312019-07-310001130310us-gaap:SeriesBPreferredStockMember2019-04-252019-04-250001130310us-gaap:SeriesBPreferredStockMember2019-01-012019-12-310001130310us-gaap:SeriesBPreferredStockMember2018-12-122018-12-120001130310us-gaap:SeriesBPreferredStockMember2018-10-232018-10-230001130310us-gaap:SeriesBPreferredStockMember2018-01-012018-12-310001130310us-gaap:SeriesCPreferredStockMember2020-12-102020-12-100001130310us-gaap:SeriesCPreferredStockMember2020-10-292020-10-290001130310us-gaap:SeriesCPreferredStockMembercnp:ThirdQuarter2020Member2020-07-292020-07-290001130310us-gaap:SeriesCPreferredStockMembercnp:SecondQuarter2020Member2020-04-242020-04-240001130310us-gaap:SeriesAPreferredStockMember2018-08-220001130310us-gaap:SeriesAPreferredStockMember2018-08-222018-08-220001130310us-gaap:SeriesAPreferredStockMemberus-gaap:LondonInterbankOfferedRateLIBORMember2020-01-012020-12-31cnp:day0001130310cnp:A120DaysAfterConclusionofRevieworAppealMember2020-12-310001130310us-gaap:SeriesAPreferredStockMembercnp:A120DaysAfterConclusionofRevieworAppealMember2020-12-310001130310cnp:DepositaryShareMember2018-10-012018-10-010001130310cnp:DepositaryShareMember2018-10-010001130310us-gaap:SeriesBPreferredStockMember2018-10-012018-10-010001130310us-gaap:SeriesBPreferredStockMember2018-10-010001130310srt:MinimumMemberus-gaap:SeriesBPreferredStockMember2020-12-310001130310srt:MaximumMemberus-gaap:SeriesBPreferredStockMember2020-12-310001130310srt:MinimumMembercnp:DepositaryShareMember2020-12-310001130310srt:MaximumMembercnp:DepositaryShareMember2020-12-310001130310srt:MaximumMemberus-gaap:SeriesBPreferredStockMember2020-01-012020-12-310001130310srt:MinimumMemberus-gaap:SeriesBPreferredStockMember2020-01-012020-12-310001130310srt:MaximumMemberus-gaap:SeriesBMember2020-01-012020-12-310001130310cnp:DepositaryShareMember2020-12-310001130310cnp:DepositaryShareMember2020-01-012020-12-310001130310us-gaap:SeriesBPreferredStockMember2020-11-270001130310us-gaap:CommonStockMember2020-11-270001130310us-gaap:SeriesCPreferredStockMember2020-05-060001130310us-gaap:SeriesCPreferredStockMember2020-05-062020-05-0600011303102020-06-010001130310us-gaap:SeriesCPreferredStockMember2020-11-020001130310us-gaap:CommonStockMember2020-11-060001130310us-gaap:SeriesCPreferredStockMember2020-11-060001130310us-gaap:CommonStockMember2020-05-062020-05-060001130310us-gaap:CommonStockMember2020-05-060001130310us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2020-01-012020-12-310001130310us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2020-01-012020-12-310001130310us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2019-01-012019-12-310001130310us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2019-01-012019-12-310001130310us-gaap:InterestRateContractMember2020-01-012020-12-310001130310us-gaap:InterestRateContractMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:InterestRateContractMember2020-01-012020-12-310001130310us-gaap:InterestRateContractMember2019-01-012019-12-310001130310us-gaap:InterestRateContractMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:InterestRateContractMember2019-01-012019-12-310001130310us-gaap:CashFlowHedgingMemberus-gaap:InterestRateContractMemberus-gaap:InterestExpenseMember2020-01-012020-12-310001130310us-gaap:CashFlowHedgingMemberus-gaap:InterestRateContractMemberus-gaap:InterestExpenseMember2019-01-012019-12-310001130310cnp:SubordinatedDebtZENSMember2019-12-310001130310cnp:SeniorNotesDueRange1Membercnp:CenterpointEnergyMembersrt:MinimumMember2020-12-310001130310cnp:SeniorNotesDueRange1Membersrt:MaximumMembercnp:CenterpointEnergyMember2020-12-310001130310cnp:SeniorNotesDueRange1Member2020-12-310001130310cnp:SeniorNotesDueRange1Member2019-12-310001130310cnp:CenterpointEnergyMembercnp:VariableratetermloanMember2020-12-310001130310cnp:VariableratetermloanMember2020-12-310001130310cnp:VariableratetermloanMember2019-12-310001130310cnp:CenterpointEnergyMembercnp:BondsPollutionControlDueRange1Member2020-12-310001130310cnp:BondsPollutionControlDueRange1Member2020-12-310001130310cnp:BondsPollutionControlDueRange1Member2019-12-310001130310us-gaap:CommercialPaperMember2020-12-310001130310us-gaap:CommercialPaperMember2019-12-310001130310cnp:VUHIMembercnp:SeniorNotesDueRange2Membersrt:MinimumMember2020-12-310001130310cnp:VUHIMembercnp:SeniorNotesDueRange2Membersrt:MaximumMember2020-12-310001130310cnp:VUHIMembercnp:SeniorNotesDueRange2Member2020-12-310001130310cnp:VUHIMembercnp:SeniorNotesDueRange2Member2019-12-310001130310cnp:VUHIMemberus-gaap:CommercialPaperMember2020-12-310001130310cnp:VUHIMemberus-gaap:CommercialPaperMember2019-12-310001130310cnp:VUHIMembercnp:VariableratetermloanMember2020-12-310001130310cnp:VUHIMembercnp:VariableratetermloanMember2019-12-310001130310cnp:VCCMembercnp:VariableratetermloanMember2020-12-310001130310cnp:VCCMembercnp:VariableratetermloanMember2019-12-310001130310srt:MinimumMemberus-gaap:SeniorNotesMembercnp:IGCMember2020-12-310001130310srt:MaximumMemberus-gaap:SeniorNotesMembercnp:IGCMember2020-12-310001130310us-gaap:SeniorNotesMembercnp:IGCMember2020-12-310001130310us-gaap:SeniorNotesMembercnp:IGCMember2019-12-310001130310cnp:SIGECOFirstMortgageBonds0875To672Due2022To2055Membercnp:SIGECOMembersrt:MinimumMember2020-12-310001130310cnp:SIGECOFirstMortgageBonds0875To672Due2022To2055Membersrt:MaximumMembercnp:SIGECOMember2020-12-310001130310cnp:SIGECOFirstMortgageBonds0875To672Due2022To2055Member2020-12-310001130310cnp:SIGECOFirstMortgageBonds0875To672Due2022To2055Member2019-12-310001130310cnp:OtherDebtMember2020-12-310001130310cnp:OtherDebtMember2019-12-310001130310cnp:UnamortizedDebtIssuanceCostsMember2020-12-310001130310cnp:UnamortizedDebtIssuanceCostsMember2019-12-310001130310cnp:BondsFirstMortgageDue2021Membercnp:HoustonElectricMember2020-12-310001130310cnp:BondsFirstMortgageDue2021Membercnp:HoustonElectricMember2019-12-310001130310srt:MinimumMembercnp:BondsGeneralMortgageDueRange1Membercnp:HoustonElectricMember2020-12-310001130310srt:MaximumMembercnp:BondsGeneralMortgageDueRange1Membercnp:HoustonElectricMember2020-12-310001130310cnp:BondsGeneralMortgageDueRange1Membercnp:HoustonElectricMember2020-12-310001130310cnp:BondsGeneralMortgageDueRange1Membercnp:HoustonElectricMember2019-12-310001130310cnp:BondsSystemRestorationDueRange1Membercnp:HoustonElectricMember2020-12-310001130310cnp:BondsSystemRestorationDueRange1Membercnp:HoustonElectricMember2019-12-310001130310cnp:BondsTransitionDueRange1MemberMembercnp:HoustonElectricMember2020-12-310001130310cnp:BondsTransitionDueRange1MemberMembercnp:HoustonElectricMember2019-12-310001130310srt:MaximumMembercnp:BondsTransitionDueRange3Membercnp:HoustonElectricMember2020-12-310001130310cnp:BondsTransitionDueRange3Membercnp:HoustonElectricMember2020-12-310001130310cnp:BondsTransitionDueRange3Membercnp:HoustonElectricMember2019-12-310001130310cnp:UnamortizedDebtIssuanceCostsMembercnp:HoustonElectricMember2020-12-310001130310cnp:UnamortizedDebtIssuanceCostsMembercnp:HoustonElectricMember2019-12-310001130310cnp:SeniorNotesDueRange2Membercnp:CercCorpMembersrt:MinimumMember2020-12-310001130310cnp:SeniorNotesDueRange2Membercnp:CercCorpMembersrt:MaximumMember2020-12-310001130310cnp:SeniorNotesDueRange2Membercnp:CercCorpMember2020-12-310001130310cnp:SeniorNotesDueRange2Membercnp:CercCorpMember2019-12-310001130310cnp:CercCorpMemberus-gaap:CommercialPaperMember2020-12-310001130310cnp:CercCorpMemberus-gaap:CommercialPaperMember2019-12-310001130310cnp:CercCorpMembercnp:UnamortizedDebtIssuanceCostsMember2020-12-310001130310cnp:CercCorpMembercnp:UnamortizedDebtIssuanceCostsMember2019-12-310001130310cnp:CenterpointEnergyMember2020-01-012020-12-310001130310cnp:VUHIMember2020-01-012020-12-310001130310cnp:VCCMembercnp:VariableratetermloanMember2020-01-012020-12-310001130310cnp:VUHIMemberus-gaap:SeniorNotesMember2020-01-012020-12-310001130310cnp:VUHIMemberus-gaap:SeniorNotesMember2020-12-310001130310cnp:VUHIMembercnp:VariableratetermloanMember2020-01-012020-12-310001130310cnp:CenterpointEnergyMembercnp:VariableratetermloanMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:CERCSeniorNotes450Due2021Member2020-12-310001130310cnp:CercCorpMembercnp:CERCSeniorNotes450Due2021Memberus-gaap:SeniorNotesMember2020-12-310001130310cnp:CercCorpMembercnp:CERCSeniorNotes450Due2021Member2020-09-302020-09-300001130310cnp:A375SeniorNotesMembercnp:CenterpointEnergyMember2020-12-012020-12-310001130310cnp:A375SeniorNotesMembercnp:CenterpointEnergyMember2020-12-310001130310cnp:A375SeniorNotesMembercnp:CenterpointEnergyMember2020-01-012020-12-310001130310cnp:GeneralMortgageBondsDue2050Membercnp:HoustonElectricMember2020-06-020001130310cnp:SIGECOMemberus-gaap:FirstMortgageMember2020-12-310001130310cnp:EnvironmentalImprovementRevenueBondsMountVernon0875Series2015Membercnp:SIGECOMemberus-gaap:FirstMortgageMember2020-09-300001130310cnp:SIGECOMembercnp:EnvironmentalImprovementRevenueBondsWarrickCounty0875Series2015Memberus-gaap:FirstMortgageMember2020-09-300001130310cnp:SIGECOMembercnp:SIGECO2020FirstMortgageBondsRemarketing0875Series2015Memberus-gaap:FirstMortgageMember2020-09-300001130310cnp:CERCSeniorNotes175Due2030Membercnp:CercCorpMemberus-gaap:SeniorNotesMember2020-10-010001130310cnp:CercCorpMembercnp:CERCSeniorNotes450Due2021Memberus-gaap:SeniorNotesMember2020-10-010001130310srt:ParentCompanyMember2020-12-310001130310us-gaap:LineOfCreditMemberus-gaap:LondonInterbankOfferedRateLIBORMembersrt:ParentCompanyMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembersrt:ParentCompanyMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembersrt:ParentCompanyMember2020-12-310001130310cnp:VUHIMember2020-12-310001130310us-gaap:LineOfCreditMemberus-gaap:LondonInterbankOfferedRateLIBORMembercnp:VUHIMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembercnp:VUHIMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembercnp:VUHIMember2020-12-310001130310us-gaap:LineOfCreditMemberus-gaap:LondonInterbankOfferedRateLIBORMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembercnp:HoustonElectricMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:LineOfCreditMemberus-gaap:LondonInterbankOfferedRateLIBORMembercnp:CercCorpMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembercnp:CercCorpMember2020-01-012020-12-310001130310us-gaap:LineOfCreditMembercnp:CercCorpMember2020-12-310001130310cnp:VCCMembercnp:VariableratetermloanMember2020-12-310001130310us-gaap:RevolvingCreditFacilityMembersrt:ParentCompanyMember2020-12-310001130310srt:ParentCompanyMemberus-gaap:LetterOfCreditMember2020-12-310001130310us-gaap:CommercialPaperMembersrt:ParentCompanyMember2020-12-310001130310us-gaap:RevolvingCreditFacilityMembersrt:ParentCompanyMember2019-12-310001130310srt:ParentCompanyMemberus-gaap:LetterOfCreditMember2019-12-310001130310us-gaap:CommercialPaperMembersrt:ParentCompanyMember2019-12-310001130310us-gaap:RevolvingCreditFacilityMembercnp:VUHIMember2020-12-310001130310cnp:VUHIMemberus-gaap:LetterOfCreditMember2020-12-310001130310us-gaap:CommercialPaperMembercnp:VUHIMember2020-12-310001130310us-gaap:RevolvingCreditFacilityMembercnp:VUHIMember2019-12-310001130310cnp:VUHIMemberus-gaap:LetterOfCreditMember2019-12-310001130310us-gaap:CommercialPaperMembercnp:VUHIMember2019-12-310001130310us-gaap:RevolvingCreditFacilityMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:LetterOfCreditMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:CommercialPaperMembercnp:HoustonElectricMember2020-12-310001130310us-gaap:RevolvingCreditFacilityMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:LetterOfCreditMembercnp:HoustonElectricMember2019-12-310001130310us-gaap:CommercialPaperMembercnp:HoustonElectricMember2019-12-310001130310cnp:CercCorpMemberus-gaap:RevolvingCreditFacilityMember2020-12-310001130310cnp:CercCorpMemberus-gaap:LetterOfCreditMember2020-12-310001130310us-gaap:CommercialPaperMembercnp:CercCorpMember2020-12-310001130310cnp:CercCorpMemberus-gaap:RevolvingCreditFacilityMember2019-12-310001130310cnp:CercCorpMemberus-gaap:LetterOfCreditMember2019-12-310001130310us-gaap:CommercialPaperMembercnp:CercCorpMember2019-12-310001130310us-gaap:RevolvingCreditFacilityMember2020-12-310001130310us-gaap:LetterOfCreditMember2020-12-310001130310us-gaap:CommercialPaperMember2020-12-310001130310us-gaap:RevolvingCreditFacilityMember2019-12-310001130310us-gaap:LetterOfCreditMember2019-12-310001130310us-gaap:CommercialPaperMember2019-12-310001130310us-gaap:SubsequentEventMember2021-02-030001130310us-gaap:SubsequentEventMember2021-02-040001130310us-gaap:LondonInterbankOfferedRateLIBORMembercnp:CenterpointEnergyMemberus-gaap:SubsequentEventMember2021-02-042021-02-040001130310us-gaap:LondonInterbankOfferedRateLIBORMemberus-gaap:SubsequentEventMembercnp:HoustonElectricMember2021-02-042021-02-040001130310us-gaap:LondonInterbankOfferedRateLIBORMembercnp:CercCorpMemberus-gaap:SubsequentEventMember2021-02-042021-02-040001130310cnp:VUHIMemberus-gaap:LondonInterbankOfferedRateLIBORMemberus-gaap:SubsequentEventMember2021-02-042021-02-040001130310srt:MaximumMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:LongtermDebtExcludingZENSMember2020-12-310001130310cnp:TransitionAndSystemRestorationBondsMember2020-12-310001130310cnp:BondsPollutionControlDueRange1Membersrt:ParentCompanyMember2020-12-310001130310cnp:SIGECOMember2020-12-310001130310cnp:VectrenMembersrt:MaximumMemberus-gaap:LetterOfCreditMember2020-12-310001130310cnp:SIGECOMemberus-gaap:LetterOfCreditMember2020-12-310001130310us-gaap:SegmentContinuingOperationsMember2019-01-012019-12-310001130310us-gaap:SegmentContinuingOperationsMember2018-01-012018-12-310001130310us-gaap:SegmentDiscontinuedOperationsMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:DomesticCountryMemberus-gaap:SegmentContinuingOperationsMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:DomesticCountryMemberus-gaap:SegmentContinuingOperationsMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:DomesticCountryMemberus-gaap:SegmentContinuingOperationsMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:StateAndLocalJurisdictionMemberus-gaap:SegmentContinuingOperationsMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:StateAndLocalJurisdictionMemberus-gaap:SegmentContinuingOperationsMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:StateAndLocalJurisdictionMemberus-gaap:SegmentContinuingOperationsMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:SegmentDiscontinuedOperationsMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:SegmentDiscontinuedOperationsMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:SegmentDiscontinuedOperationsMember2018-01-012018-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMembercnp:StateValuationAllowancenetofFederalIncomeTaxesMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMembercnp:StateValuationAllowancenetofFederalIncomeTaxesMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMembercnp:StateValuationAllowancenetofFederalIncomeTaxesMember2018-01-012018-12-310001130310us-gaap:StateAndLocalJurisdictionMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:StateAndLocalJurisdictionMember2019-01-012019-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMember2020-12-310001130310cnp:CercCorpMemberus-gaap:SegmentContinuingOperationsMember2019-12-310001130310cnp:VectrenMember2019-02-012019-02-010001130310cnp:VectrenMember2020-12-310001130310cnp:VectrenMembercnp:CharitableContributionMember2020-12-310001130310us-gaap:StateAndLocalJurisdictionMember2020-12-310001130310cnp:CercCorpMemberus-gaap:DomesticCountryMember2020-12-310001130310cnp:CercCorpMemberus-gaap:StateAndLocalJurisdictionMember2020-12-310001130310cnp:NaturalGasAndCoalMember2020-12-310001130310cnp:CercCorpMembercnp:NaturalGasAndCoalMember2020-12-310001130310cnp:TechnologyHardwareAndSoftwareMember2020-12-310001130310cnp:EnergyServicesDisposalGroupMembercnp:CercCorpMember2020-01-012020-12-310001130310cnp:CercCorpMemberus-gaap:DamageFromFireExplosionOrOtherHazardMember2020-12-310001130310us-gaap:DamageFromFireExplosionOrOtherHazardMember2020-12-31cnp:site0001130310cnp:IndianaGasServiceTerritoryMember2020-12-310001130310cnp:SIGECOMember2020-12-310001130310cnp:MinnesotaandIndianaGasServiceTerritoryMember2020-12-310001130310cnp:CercCorpMembercnp:MinnesotaandIndianaGasServiceTerritoryMember2020-12-310001130310cnp:MinnesotaandIndianaGasServiceTerritoryMembersrt:MinimumMember2020-01-012020-12-310001130310cnp:CercCorpMembercnp:MinnesotaandIndianaGasServiceTerritoryMembersrt:MinimumMember2020-01-012020-12-310001130310srt:MaximumMembercnp:MinnesotaandIndianaGasServiceTerritoryMember2020-01-012020-12-310001130310cnp:CercCorpMembersrt:MaximumMembercnp:MinnesotaandIndianaGasServiceTerritoryMember2020-01-012020-12-310001130310cnp:IndianaElectricMember2020-12-310001130310cnp:IndianaElectricMembersrt:MinimumMember2020-12-310001130310srt:MaximumMembercnp:IndianaElectricMember2020-12-310001130310us-gaap:RestrictedStockMember2020-01-012020-12-310001130310us-gaap:RestrictedStockMember2019-01-012019-12-310001130310us-gaap:RestrictedStockMember2018-01-012018-12-310001130310us-gaap:RestrictedStockMember2020-01-012020-12-310001130310us-gaap:OperatingSegmentsMembercnp:ElectricMember2020-01-012020-12-310001130310us-gaap:OperatingSegmentsMembercnp:NaturalGasMember2020-01-012020-12-310001130310us-gaap:OperatingSegmentsMembercnp:MidstreamInvestmentsMember2020-01-012020-12-310001130310us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2020-01-012020-12-310001130310us-gaap:IntersegmentEliminationMember2020-01-012020-12-310001130310us-gaap:OperatingSegmentsMembercnp:ElectricMember2019-01-012019-12-310001130310us-gaap:OperatingSegmentsMembercnp:NaturalGasMember2019-01-012019-12-310001130310us-gaap:OperatingSegmentsMembercnp:MidstreamInvestmentsMember2019-01-012019-12-310001130310us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2019-01-012019-12-310001130310us-gaap:IntersegmentEliminationMember2019-01-012019-12-310001130310us-gaap:OperatingSegmentsMembercnp:ElectricMember2018-01-012018-12-310001130310us-gaap:OperatingSegmentsMembercnp:NaturalGasMember2018-01-012018-12-310001130310us-gaap:OperatingSegmentsMembercnp:MidstreamInvestmentsMember2018-01-012018-12-310001130310us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2018-01-012018-12-310001130310us-gaap:IntersegmentEliminationMember2018-01-012018-12-310001130310cnp:AffiliatesOfNrgEnergyIncMembercnp:ElectricMember2020-01-012020-12-310001130310cnp:AffiliatesOfNrgEnergyIncMembercnp:ElectricTransmissionDistributionMembercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:AffiliatesOfNrgEnergyIncMembercnp:ElectricTransmissionDistributionMembercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:AffiliatesOfNrgEnergyIncMembercnp:ElectricMember2019-01-012019-12-310001130310cnp:AffiliatesOfNrgEnergyIncMembercnp:ElectricTransmissionDistributionMembercnp:HoustonElectricMember2018-01-012018-12-310001130310cnp:AffiliatesOfNrgEnergyIncMembercnp:ElectricMember2018-01-012018-12-310001130310cnp:AffiliatesofVistraEnergyCorp.Membercnp:ElectricMember2020-01-012020-12-310001130310cnp:ElectricTransmissionDistributionMembercnp:AffiliatesofVistraEnergyCorp.Membercnp:HoustonElectricMember2020-01-012020-12-310001130310cnp:ElectricTransmissionDistributionMembercnp:AffiliatesofVistraEnergyCorp.Membercnp:HoustonElectricMember2019-01-012019-12-310001130310cnp:AffiliatesofVistraEnergyCorp.Membercnp:ElectricMember2019-01-012019-12-310001130310cnp:AffiliatesofVistraEnergyCorp.Membercnp:ElectricMember2018-01-012018-12-310001130310cnp:ElectricTransmissionDistributionMembercnp:AffiliatesofVistraEnergyCorp.Membercnp:HoustonElectricMember2018-01-012018-12-310001130310us-gaap:OperatingSegmentsMembercnp:ElectricMember2020-12-310001130310us-gaap:OperatingSegmentsMembercnp:ElectricMember2019-12-310001130310us-gaap:OperatingSegmentsMembercnp:ElectricMember2018-12-310001130310us-gaap:OperatingSegmentsMembercnp:NaturalGasMember2020-12-310001130310us-gaap:OperatingSegmentsMembercnp:NaturalGasMember2019-12-310001130310us-gaap:OperatingSegmentsMembercnp:NaturalGasMember2018-12-310001130310us-gaap:OperatingSegmentsMembercnp:MidstreamInvestmentsMember2020-12-310001130310us-gaap:OperatingSegmentsMembercnp:MidstreamInvestmentsMember2019-12-310001130310us-gaap:OperatingSegmentsMembercnp:MidstreamInvestmentsMember2018-12-310001130310us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2020-12-310001130310us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2019-12-310001130310us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2018-12-310001130310us-gaap:SegmentContinuingOperationsMember2020-12-310001130310us-gaap:SegmentContinuingOperationsMember2019-12-310001130310us-gaap:SegmentContinuingOperationsMember2018-12-31