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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Reference Shares (Details) - Subordinated Debt, ZENS, Due 2029 - shares | Mar. 31, 2024 | Dec. 31, 2023
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AT&T Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.7185 | 0.7185
Charter Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.061382 | 0.061382
WBD Common |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Number of shares referenced in exchangeable subordinated note (in shares) | 0.173817 | 0.173817

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- 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
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