XML 97 R80.htm IDEA: XBRL DOCUMENT
v3.23.1

Short-term Borrowings and Long-term Debt - Debt Repayments and Redemptions (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Jan. 17, 2023
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] |  |
Interest rate of debt (as a percent) | 1.50% |
CERC |  |
Debt Instrument [Line Items] |  |
Aggregate Principal Amount | $ 1,700 |
CERC | Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate of debt (as a percent) | 0.70% |
CERC | CERC Term Loan 0.70%Due 2023 |  |
Debt Instrument [Line Items] |  |
Aggregate Principal Amount | $ 500 |
CERC | CERC Term Loan 0.70%Due 2023 | SOFR |  |
Debt Instrument [Line Items] |  |
Interest rate of debt (as a percent) | 0.70% |
CERC | CERC Senior Notes .70% due 2023 | Term Loan | SOFR |  |
Debt Instrument [Line Items] |  |
Adjustment to basis spread (as a percent) | 0.10% |
Long-term Debt |  |
Debt Instrument [Line Items] |  |
Aggregate Principal Amount | $ 2,036 |
Long-term Debt | CERC |  |
Debt Instrument [Line Items] |  |
Aggregate Principal Amount | 1,775 |
Long-term Debt | CERC | CERC Senior Notes 0.70% Due 2023 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Aggregate Principal Amount | $ 700 |
Interest rate of debt (as a percent) | 0.70% |
Long-term Debt | CERC | CERC Floating Rate Senior 0.5% Due 2023 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Aggregate Principal Amount | $ 575 |
Long-term Debt | CERC | CERC Floating Rate Senior 0.5% Due 2023 | Senior Notes | LIBOR Plus |  |
Debt Instrument [Line Items] |  |
Interest rate of debt (as a percent) | 0.50% |
Long-term Debt | SIGECO | CNP First Mortgage Bonds 4.00% Due 2044 | First Mortgage Bonds |  |
Debt Instrument [Line Items] |  |
Aggregate Principal Amount | $ 11 | $ 11
Interest rate of debt (as a percent) | 4.00% |
Long-term Debt | SIGECO | CNP First Mortgage Bonds Due 2044 | First Mortgage Bonds |  |
Debt Instrument [Line Items] |  |
Debt instrument, redemption price (as a percent) | 100.00% |

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

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | dei_LegalEntityAxis=cnp_CercCorpMember
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_DebtInstrumentAxis=cnp_CERCTermLoanZeroPointSevenDue2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CERCTermLoanDue2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ExtinguishmentOfDebtAxis=us-gaap_LongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CERCSeniorNotes070PercentageDue2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=cnp_CERCFloatingRateSeniorNotesZeroPointFivePercentageDue2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=cnp_LIBORPlusMember
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_DebtInstrumentAxis=cnp_CNPFirstMortgageBonds400Due2044Member
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: | us-gaap_DebtInstrumentAxis=cnp_CNPFirstMortgageBondsDue2044Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |