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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 08, 2022
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2021
USD ($)
Dec. 31, 2021
shares
Sep. 30, 1999
USD ($)
Debt and Equity Securities, FV-NI [Line Items]              
Unrealized losses | $   $ 61 $ 75 $ 164 $ 52    
AT&T Common | Subordinated Debt ZENS              
Debt and Equity Securities, FV-NI [Line Items]              
Number of shares referenced in exchangeable subordinated note (in shares) 0.7185 0.7185   0.7185   0.7185  
Charter Common | Subordinated Debt ZENS              
Debt and Equity Securities, FV-NI [Line Items]              
Number of shares referenced in exchangeable subordinated note (in shares) 0.061382 0.061382   0.061382   0.061382  
WBD Common | Subordinated Debt ZENS              
Debt and Equity Securities, FV-NI [Line Items]              
Number of shares referenced in exchangeable subordinated note (in shares) 0.173817            
AT&T              
Debt and Equity Securities, FV-NI [Line Items]              
Shares received (in shares) 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   $ 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%   2.00%      
Target annual yield on reference shares (as a percent)   2.309%   2.309%      
Contingent principal amount of ZENS | $   $ 31   $ 31      
Subordinated Debt ZENS | WBD Common              
Debt and Equity Securities, FV-NI [Line Items]              
Number of shares referenced in exchangeable subordinated note (in shares)   0.173817   0.173817   0