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Regulatory Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 22, 2021
Regulatory Assets [Line Items]            
Allowed equity return not recognized $ 190   $ 190   $ 199  
Allowed equity return recognized 12 $ 11 22 $ 19    
Regulatory assets 1,350   1,350   1,395  
Non-current regulatory asset 2,229   2,229   2,321  
February 2021 Winter Storm Event            
Regulatory Assets [Line Items]            
Regulatory assets         1,410  
Non-current regulatory asset         583  
February 2021 Winter Storm Event | Arkansas and Oklahoma Natural Gas Businesses            
Regulatory Assets [Line Items]            
Regulatory assets         154  
Non-current regulatory asset         244  
February 2021 Winter Storm            
Regulatory Assets [Line Items]            
Regulatory assets 1,186   1,186      
Non-current regulatory asset 272   272      
February 2021 Winter Storm | REP Bad Debt Expense            
Regulatory Assets [Line Items]            
Regulatory assets 8   8   8  
February 2021 Winter Storm | Operation and maintenance expense            
Regulatory Assets [Line Items]            
Regulatory assets 15   15   15  
Houston Electric            
Regulatory Assets [Line Items]            
Allowed equity return not recognized 89   89   100  
Allowed equity return recognized 12 11 21 18    
Non-current regulatory asset 765   765   789  
Houston Electric | February 2021 Winter Storm | REP Bad Debt Expense            
Regulatory Assets [Line Items]            
Regulatory assets 8   8   8  
Houston Electric | February 2021 Winter Storm | Operation and maintenance expense            
Regulatory Assets [Line Items]            
Regulatory assets 15   15   15  
CERC            
Regulatory Assets [Line Items]            
Allowed equity return not recognized 51   51   51  
Allowed equity return recognized 1 $ 1 1 $ 1    
Regulatory assets 1,331   1,331   1,371  
Non-current regulatory asset 865   865   938  
CERC | February 2021 Winter Storm Event            
Regulatory Assets [Line Items]            
Regulatory liabilities 398   398      
Regulatory assets         1,399  
Non-current regulatory asset         583  
CERC | February 2021 Winter Storm Event | Arkansas and Oklahoma Natural Gas Businesses            
Regulatory Assets [Line Items]            
Regulatory assets         154  
Non-current regulatory asset         $ 244  
CERC | February 2021 Winter Storm            
Regulatory Assets [Line Items]            
Regulatory assets 1,185   1,185      
Non-current regulatory asset $ 272   $ 272      
CERC | Department Of Commerce            
Regulatory Assets [Line Items]            
Regulatory liabilities           $ 45
CERC | Citizens Utility Board            
Regulatory Assets [Line Items]            
Regulatory liabilities           82
CERC | Attorney General's Office            
Regulatory Assets [Line Items]            
Regulatory liabilities           409
CERC | Attorney General's Office Alternative            
Regulatory Assets [Line Items]            
Regulatory liabilities           $ 57