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Regulatory Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Amount of allowed equity return not recognized in the period $ 217   $ 217   $ 229
Allowed equity return recognized 11 $ 8 19 $ 14  
Non-current regulatory asset 3,427   3,427   2,094
February 2021 Winter Storm Event          
Potential disallowance of recovery of costs 290   290    
February 2021 Winter Storm          
Current regulatory asset 325   325    
Non-current regulatory asset 1,774   1,774    
February 2021 Winter Storm | REP Bad Debt Expense          
Regulatory assets 8   8    
February 2021 Winter Storm | Operation and maintenance expense          
Regulatory assets 12   12    
Public Utility Commission of Texas          
COVID-19 ERP Regulatory Asset 0   0   6
Houston Electric          
Amount of allowed equity return not recognized in the period 121   121   137
Allowed equity return recognized 11 8 18 14  
Non-current regulatory asset 803   803   848
Houston Electric | February 2021 Winter Storm | REP Bad Debt Expense          
Regulatory assets 8   8    
Houston Electric | February 2021 Winter Storm | Operation and maintenance expense          
Regulatory assets 12   12    
Houston Electric | Public Utility Commission of Texas          
COVID-19 ERP Regulatory Asset 0   0   6
CERC Corp          
Amount of allowed equity return not recognized in the period 14   14   13
Allowed equity return recognized 0 $ 0 0 $ 0  
Non-current regulatory asset 1,598   1,598   220
CERC Corp | February 2021 Winter Storm Event          
Potential disallowance of recovery of costs 290   290    
CERC Corp | February 2021 Winter Storm          
Current regulatory asset 222   222    
Non-current regulatory asset 1,763   1,763    
Natural Gas          
Incremental uncollectible receivables, regulatory asset 28   28   22
Natural Gas | CERC Corp          
Incremental uncollectible receivables, regulatory asset $ 26   $ 26   $ 19