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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Gain (Loss) On Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total unrealized gains (losses) on equity securities, net | $ 20 | $ 31 | $ (227)
AT&T Common |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total unrealized gains (losses) on equity securities, net | 62 | (17) | (63)
Charter Common |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total unrealized gains (losses) on equity securities, net | (40) | 43 | (273)
WBD Common |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total unrealized gains (losses) on equity securities, net | (2) | 5 | 23
Energy Transfer Common Units |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total unrealized gains (losses) on equity securities, net | 0 | 0 | 95
Energy Transfer Series G Preferred Units |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total unrealized gains (losses) on equity securities, net | $ 0 | $ 0 | $ (9)

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