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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]      
Beginning balance $ 541    
Beginning balance 5    
Beginning balance 605    
Gain (loss) on indexed debt securities 14 $ 27 $ (325)
Gain (loss) on ZENS-related securities 20 31 (227)
Ending balance 561 541  
Ending balance 2 5  
Ending balance 619 605  
ZENS-Related Securities      
Debt and Equity Securities, FV-NI [Line Items]      
Beginning balance 538 507 820
Accretion of debt component of ZENS 0 0 0
2% interest paid 0 0 0
Distribution to ZENS holders 0 0 0
Gain (loss) on indexed debt securities 0 0 0
Gain (loss) on ZENS-related securities 20 31 (313)
Ending balance 558 538 507
Debt Component of ZENS      
Debt and Equity Securities, FV-NI [Line Items]      
Beginning balance 5 7 10
Accretion of debt component of ZENS 16 17 17
2% interest paid (17) (17) (17)
Distribution to ZENS holders (2) (2) (3)
Gain (loss) on indexed debt securities 0 0 0
Gain (loss) on ZENS-related securities 0 0 0
Ending balance 2 5 7
Derivative Component of ZENS      
Debt and Equity Securities, FV-NI [Line Items]      
Beginning balance 605 578 903
Accretion of debt component of ZENS 0 0 0
2% interest paid 0 0 0
Distribution to ZENS holders 0 0 0
Gain (loss) on indexed debt securities 14 27 (325)
Gain (loss) on ZENS-related securities 0 0 0
Ending balance $ 619 $ 605 $ 578