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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
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)