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Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Narrative (Details) - USD ($)
12 Months Ended
Dec. 08, 2021
Dec. 02, 2021
May 17, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 16, 2021
Debt and Equity Securities, FV-NI [Line Items]              
Merger exchange ratio             0.8595
Unrealized gains (loss) on equity securities       $ (52,000,000) $ 49,000,000 $ 282,000,000  
Target Annual Yield On Reference Shares       2.309%      
ZENS-Related Securities       $ 1,439,000,000 871,000,000    
AT&T              
Debt and Equity Securities, FV-NI [Line Items]              
Ownership (percentage)     71.00%        
Shares expected to be received     0.24        
Energy Transfer Common Units              
Debt and Equity Securities, FV-NI [Line Items]              
Units sold (in shares) 50,000,000            
Enable Midstream Partners              
Debt and Equity Securities, FV-NI [Line Items]              
Merger exchange ratio   0.8595          
Cash received   $ 5,000,000          
Enable Midstream Partners | Enable Common Units              
Debt and Equity Securities, FV-NI [Line Items]              
Equity interests received (in shares)   233,856,623          
Enable Midstream Partners | Energy Transfer Common Units              
Debt and Equity Securities, FV-NI [Line Items]              
Equity interests received (in shares)   200,999,768          
Enable Midstream Partners | Energy Transfer Common Units | Series G Preferred Stock              
Debt and Equity Securities, FV-NI [Line Items]              
Liquidation preference   $ 385,000,000          
Enable Midstream Partners | Energy Transfer Common Units | Series A Preferred Stock              
Debt and Equity Securities, FV-NI [Line Items]              
Equity interests received (in shares)   14,520,000          
Equity interest received   $ 363,000,000          
Enable Midstream Partners | Energy Transfer Common Units | Energy Transfer Series G Preferred Units              
Debt and Equity Securities, FV-NI [Line Items]              
Equity interests received (in shares)   384,780          
ZENS-Related Securities              
Debt and Equity Securities, FV-NI [Line Items]              
ZENS-Related Securities       820,000,000 $ 871,000,000 $ 822,000,000  
ZENS debt              
Debt and Equity Securities, FV-NI [Line Items]              
Principal amount of debt issued       1,000,000,000      
Outstanding debt balance       $ 828,000,000      
Subordinated note cash exchangeable percentage of fair value       95.00%      
ZENS annual interest rate       2.00%      
Contingent principal amount of indexed debt securities issued by CenterPoint Energy in September 1999 and outstanding and exchangeable       $ 38,000,000      
The cash exchange amount from referenced shares per $1,000 face amount of individual notes       941      
Face amount of each indexed debt security notes issued by CenterPoint Energy in September 1999       $ 1,000