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Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Current income taxes:      
State $ 25 $ 16 $ 16
Federal 151 136 28
Total current income taxes 176 152 44
Deferred income taxes:      
State 36 53 44
Federal 100 104 165
Amortization of deferred investment tax credits (1) (1) (1)
Total deferred income taxes 135 156 208
Provision for income taxes $ 311 $ 308 $ 252