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Income Taxes - Schedule of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current income tax expense (benefit):      
Federal $ (17) $ 106 $ 294
State (9) 33 46
Total current expense (benefit) (26) 139 340
Deferred income tax expense (benefit):      
Federal 218 119 16
State 3 (88) 4
Total deferred expense (benefit) 221 31 20
Total income tax expense (benefit) 195 170 360
Houston Electric      
Current income tax expense (benefit):      
Federal 62 (26) 23
State 15 34 16
Total current expense (benefit) 77 8 39
Deferred income tax expense (benefit):      
Federal 60 159 86
State 1 1 0
Total deferred expense (benefit) 61 160 86
Total income tax expense (benefit) 138 168 125
CERC      
Current income tax expense (benefit):      
Federal 55 12 30
State (6) 3 28
Total current expense (benefit) 49 15 58
Deferred income tax expense (benefit):      
Federal 60 95 164
State (5) (136) 14
Total deferred expense (benefit) 55 (41) 178
Total income tax expense (benefit) $ 104 $ (26) $ 236