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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 | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | $ 19 | $ (31) | $ (64) | $ 7
AT&T Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | 15 | (34) | 24 | (25)
Charter Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | 7 | 9 | (78) | 25
WBD Common |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | (3) | (6) | (10) | 8
Other |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gain (loss) on equity securities | $ 0 | $ 0 | $ 0 | $ (1)

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