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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Securities Classified as Trading (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]    
Carrying value $ 541 $ 510
AT&T Common    
Debt and Equity Securities, FV-NI [Line Items]    
Balance of investment owned (in shares) 10,212,945 10,212,945
Carrying value $ 171 $ 188
Charter Common    
Debt and Equity Securities, FV-NI [Line Items]    
Balance of investment owned (in shares) 872,503 872,503
Carrying value $ 339 $ 296
WBD Common    
Debt and Equity Securities, FV-NI [Line Items]    
Balance of investment owned (in shares) 2,470,685 2,470,685
Carrying value $ 28 $ 23
Other    
Debt and Equity Securities, FV-NI [Line Items]    
Carrying value $ 3 $ 3