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Income Taxes - Components of Income Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current income tax expense:      
State income tax $ 2 $ 2 $ 1
Canadian federal and provincial income and withholding taxes 193 143 83
Total current income tax expense 195 145 84
Deferred income tax expense/(benefit):      
Canadian federal and provincial income tax (28) (24) 105
Total deferred income tax expense/(benefit) (28) (24) 105
Total income tax expense $ 167 $ 121 $ 189