XML 102 R78.htm IDEA: XBRL DOCUMENT
v3.23.3

Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Reference Shares (Details) - shares | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
AT&T Common | Subordinated Debt ZENS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.7185 | 0.7185
Charter Common | Subordinated Debt ZENS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.061382 | 0.061382
WBD Common | Subordinated Debt ZENS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.173817 | 0.173817

X
- Definition Number of shares attributable to each note and referenced in determining the fair value of the cash to be exchange at behest of note holder. + References No definition available. + Details
Name: | cnp_NumberOfSharesReferencedInExchangeableSubordinatedNote
Namespace Prefix: | cnp_
Data Type: | xbrli:decimalItemType
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_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cnp_ATTCommonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cnp_CharterCommonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cnp_WBDCommonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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