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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Reference Shares (Details) - shares | Mar. 31, 2023 | Dec. 31, 2022
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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

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