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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax expense (benefit):      
Total deferred expense (benefit) $ 20 $ 213 $ (429)
Total income tax expense (benefit) 360 110 80
Houston Electric      
Current income tax expense (benefit):      
Federal 23 22 76
State 16 22 19
Total current expense (benefit) 39 44 95
Deferred income tax expense (benefit):      
Federal 86 31 (42)
Federal 23 22 76
State 0 1 0
Total deferred expense (benefit) 86 32 (42)
Total income tax expense (benefit) 125 76 53
CERC Corp      
Deferred income tax expense (benefit):      
Total deferred expense (benefit) 178 101 113
Total income tax expense (benefit) 236 76 117
Continuing Operations      
Current income tax expense (benefit):      
Federal 294 0 (36)
State 46 (28) 32
Total current expense (benefit) 340 (28) (4)
Deferred income tax expense (benefit):      
Federal 16 78 63
Federal 294 0 (36)
State 4 60 21
Total deferred expense (benefit) 20 138 84
Total income tax expense (benefit) 360 110 80
Continuing Operations | CERC Corp      
Current income tax expense (benefit):      
Federal 30 0 0
State 28 (25) 2
Total current expense (benefit) 58 (25) 2
Deferred income tax expense (benefit):      
Federal 164 67 42
Federal 30 0 0
State 14 34 73
Total deferred expense (benefit) 178 101 115
Total income tax expense (benefit) 236 76 117
Discontinued Operations      
Current income tax expense (benefit):      
Federal 0 91 152
State 0 35 28
Total current expense (benefit) 0 126 180
Deferred income tax expense (benefit):      
Federal 0 127 (422)
Federal 0 91 152
State 0 (52) (91)
Total deferred expense (benefit) 0 75 (513)
Total income tax expense (benefit) 0 201 (333)
Discontinued Operations | CERC Corp      
Current income tax expense (benefit):      
Federal 0 0 0
State 0 0 0
Total current expense (benefit) 0 0 0
Deferred income tax expense (benefit):      
Federal 0 0 0
Federal 0 0 0
State 0 0 (2)
Total deferred expense (benefit) 0 0 (2)
Total income tax expense (benefit) $ 0 $ 0 $ (2)