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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details)
$ in Millions
3 Months Ended
Apr. 08, 2022
shares
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2021
USD ($)
Dec. 31, 2021
shares
Sep. 30, 1999
USD ($)
Debt and Equity Securities, FV-NI [Line Items]          
Unrealized losses | $   $ (103) $ (23)    
AT&T Common | Subordinated Debt ZENS          
Debt and Equity Securities, FV-NI [Line Items]          
Number of shares referenced in exchangeable subordinated note   0.7185   0.7185  
AT&T Common | Subordinated Debt ZENS | Subsequent Event          
Debt and Equity Securities, FV-NI [Line Items]          
Number of shares referenced in exchangeable subordinated note 0.7185        
Charter Common | Subordinated Debt ZENS          
Debt and Equity Securities, FV-NI [Line Items]          
Number of shares referenced in exchangeable subordinated note   0.061382   0.061382  
Charter Common | Subordinated Debt ZENS | Subsequent Event          
Debt and Equity Securities, FV-NI [Line Items]          
Number of shares referenced in exchangeable subordinated note 0.061382        
WBD Common | Subordinated Debt ZENS | Subsequent Event          
Debt and Equity Securities, FV-NI [Line Items]          
Number of shares referenced in exchangeable subordinated note 0.173817        
AT&T | Subsequent Event          
Debt and Equity Securities, FV-NI [Line Items]          
Shares received 0.241917        
Stock representing share of new company (as a percent) 71.00%        
Subordinated Debt ZENS          
Debt and Equity Securities, FV-NI [Line Items]          
Principal amount of ZENS issued or outstanding | $   $ 828     $ 1,000
Subordinated note cash exchangeable percentage of fair value (as a percent)   95.00%      
ZENS annual interest rate (as a percent)   2.00%      
Target annual yield on reference shares (as a percent)   2.309%      
Contingent principal amount of ZENS | $   $ 33