XML 216 R99.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Short-term Borrowings and Long-term Debt - Debt Transactions (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) numberOfTranche
CERC Corp |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 2,000
General Mortgage Bonds | Houston Electric |
Debt Instrument [Line Items] |
Aggregate Principal Amount | 1,400
Proceeds from issuance of long-term debt and capital securities, net | 890
Term Loan |
Debt Instrument [Line Items] |
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 250
Senior Notes | CERC Corp |
Debt Instrument [Line Items] |
Debt instrument interest rate (as a percent) | 0.70%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 1,200
First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Debt instrument, number of tranche | numberOfTranche | 3
Securitization Bonds | SIGECO |
Debt Instrument [Line Items] |
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 337
Senior Notes, Term Loan, Securitization Bonds, FMBs and GMBs |
Debt Instrument [Line Items] |
Aggregate Principal Amount | 6,041
General Mortgage Bonds 4.95% Due 2033 | General Mortgage Bonds | Houston Electric |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 600
Debt instrument interest rate (as a percent) | 4.95%
General Mortgage Bonds 5.30% Due 2053 | General Mortgage Bonds | Houston Electric |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 300
Debt instrument interest rate (as a percent) | 5.30%
General Mortgage Bonds 5.20% Due 2028 | General Mortgage Bonds | Houston Electric |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 500
Debt instrument interest rate (as a percent) | 5.20%
Proceeds from issuance of long-term debt and capital securities, net | $ 496
CERC Term Loan 0.85% Due 2024 | Term Loan | CERC Corp |
Debt Instrument [Line Items] |
Aggregate Principal Amount | 500
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 500
CERC Term Loan 0.85% Due 2024 | Term Loan | CERC Corp | SOFR |
Debt Instrument [Line Items] |
Basis spread (as a percent) | 0.85%
Adjustment to basis spread (as a percent) | 0.10%
CERC Senior Notes 5.25% Due 2028 | Senior Notes | CERC Corp |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 600
Debt instrument interest rate (as a percent) | 5.25%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 308
Interest payable | 3
CERC Senior Notes 5.40% Due 2033 | Senior Notes | CERC Corp |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 600
Debt instrument interest rate (as a percent) | 5.40%
CERC Senior Notes, 5.25% Due May 2028 | Senior Notes | CERC Corp |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 300
Debt instrument interest rate (as a percent) | 5.25%
CNP First Mortgage Bonds 4.98% Due 2028 | First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 100
Debt instrument interest rate (as a percent) | 4.98%
CNP First Mortgage Bonds 5.04% Due 2033 | First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 80
Debt instrument interest rate (as a percent) | 5.04%
CNP Term Loan 1.50% Due 2023 |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 250
CNP Term Loan 1.50% Due 2023 | Term Loan |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 250
CNP Term Loan 1.50% Due 2023 | Term Loan | SOFR |
Debt Instrument [Line Items] |
Debt instrument interest rate (as a percent) | 1.50%
Basis spread (as a percent) | 1.50%
Adjustment to basis spread (as a percent) | 0.10%
CNP Securitization Bonds | Securitization Bonds | SIGECO |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 341
CNP Securitization Bonds | Securitization Bonds | SIGECO | Minimum |
Debt Instrument [Line Items] |
Debt instrument interest rate (as a percent) | 5.026%
CNP Securitization Bonds | Securitization Bonds | SIGECO | Maximum |
Debt Instrument [Line Items] |
Debt instrument interest rate (as a percent) | 5.172%
CNP Convertible Notes 4.25% Due 2026 | Convertible Notes |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 1,000
Debt instrument interest rate (as a percent) | 4.25%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 985
CNP Senior Notes 5.25% Due 2026 | Senior Notes |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 400
Debt instrument interest rate (as a percent) | 5.25%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | $ 397
CNP First Mortgage Bonds 5.75% to 6% Due 2034 | First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Aggregate Principal Amount | 470
Proceeds from issuance of long-term debt and capital securities, net | $ 467
CNP First Mortgage Bonds 5.75% to 6% Due 2034 | First Mortgage Bonds | SIGECO | Minimum |
Debt Instrument [Line Items] |
Debt instrument interest rate (as a percent) | 5.75%
CNP First Mortgage Bonds 5.75% to 6% Due 2034 | First Mortgage Bonds | SIGECO | Maximum |
Debt Instrument [Line Items] |
Debt instrument interest rate (as a percent) | 6.00%
Various New or Existing Projects | General Mortgage Bonds | Houston Electric |
Debt Instrument [Line Items] |
Proceeds form issuance of debt, amount to be disbursed or allocated to finance or refinance projects | $ 296
Term Loan Due February 2024 | Term Loan | CERC Corp |
Debt Instrument [Line Items] |
Aggregate Principal Amount | 500
CNP First Mortgage Bonds, 4.98% Due 2028 And 5.04% Due 2033 | First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees | 179
CNP First Mortgage Bonds 5.75% Due 2029 | First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 180
Debt instrument interest rate (as a percent) | 5.75%
CNP First Mortgage Bonds 5.91% Due 2030 | First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 105
Debt instrument interest rate (as a percent) | 5.91%
CNP First Mortgage Bonds 6.00% Due 2034 | First Mortgage Bonds | SIGECO |
Debt Instrument [Line Items] |
Aggregate Principal Amount | $ 185
Debt instrument interest rate (as a percent) | 6.00%
General Company Purposes, Including Houstons Electric Borrowings Under the Centerpoint Energy Money Pool | General Mortgage Bonds | Houston Electric |
Debt Instrument [Line Items] |
Proceeds form issuance of debt, amount to be disbursed or allocated to finance or refinance projects | $ 593

X
- Definition Debt Instrument, Basis Spread On Variable Rate, Adjustment + References No definition available. + Details
Name: | cnp_DebtInstrumentBasisSpreadOnVariableRateAdjustment
Namespace Prefix: | cnp_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Number of Tranche + References No definition available. + Details
Name: | cnp_DebtInstrumentNumberOfTranche
Namespace Prefix: | cnp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds From Issuance Of Debt, Amount To Be Disbursed Or Reallocated + References No definition available. + Details
Name: | cnp_ProceedsFromIssuanceOfDebtAmountToBeDisbursedOrReallocated
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Proceeds From Issuance Of Long-Term Debt, Net Of Premiums, Discounts And Issuance Expenses And Fees + References No definition available. + Details
Name: | cnp_ProceedsFromIssuanceOfLongTermDebtNetOfPremiumsDiscountsAndIssuanceExpensesAndFees
Namespace Prefix: | cnp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482949/835-30-55-8 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69E Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69F -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69F Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F Reference 25: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_InterestPayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash inflow from long-term debt, finance lease obligation, and mandatorily redeemable capital security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cnp_CercCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cnp_GeneralMortgageBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cnp_HoustonElectricMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cnp_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cnp_FirstMortgageBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cnp_SIGECOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cnp_SecuritizationBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cnp_SeniorNotesTermLoanSecuritizationBondsFMBsAndGMBsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_GeneralMortgageBonds495Due2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_GeneralMortgageBonds530Due2053Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_GeneralMortgageBonds520Due2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CERCTermLoan085Due2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=cnp_SecuredOvernightFinancingRateSOFRMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CERCSeniorNotes525DueFebruary2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CERCSeniorNotes540Due2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CERCSeniorNotes525DueMay2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds498Due2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds504Due2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPTermLoan150Due2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_SIGECOSecuritizationBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPConvertibleNotes425Due2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPSeniorNotes525Due2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds575To6Due2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_VariousNewOrExistingProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_TermLoanDueFebruary2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds4.98Due2028And5.04Due2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds575Due2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds591Due2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds600Due2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_GeneralCompanyPurposesIncludingHoustonsElectricBorrowingsUnderTheCenterpointEnergyMoneyPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |