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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
Mar. 31, 2023
Mar. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]    
Gain (loss) on equity securities $ 38 $ (17)
AT&T Common    
Debt and Equity Securities, FV-NI [Line Items]    
Gain (loss) on equity securities 9 (10)
Charter Common    
Debt and Equity Securities, FV-NI [Line Items]    
Gain (loss) on equity securities 16 (93)
WBD Common    
Debt and Equity Securities, FV-NI [Line Items]    
Gain (loss) on equity securities 14 0
Energy Transfer Common Units    
Debt and Equity Securities, FV-NI [Line Items]    
Gain (loss) on equity securities 0 95
Energy Transfer Series G Preferred Units    
Debt and Equity Securities, FV-NI [Line Items]    
Gain (loss) on equity securities 0 (9)
Other    
Debt and Equity Securities, FV-NI [Line Items]    
Gain (loss) on equity securities $ (1) $ 0