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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Gain (Loss) On Equity Securities (CenterPoint Energy) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total gains (losses) on equity securities, net | $ (104) | $ 54 | $ 18 | $ (10)
AT&T Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total gains (losses) on equity securities, net | (8) | 29 | 55 | 53
Charter Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total gains (losses) on equity securities, net | (116) | 22 | (59) | (56)
WBD Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total gains (losses) on equity securities, net | $ 20 | $ 3 | $ 22 | $ (7)

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