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Income Taxes - Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current income tax expense:      
State income tax $ 2 $ 1 $ 2
Canadian federal and provincial income tax 143 83 48
Total current income tax expense 145 84 50
Deferred income tax expense/(benefit):      
Canadian federal and provincial income tax (24) 105 23
Total deferred income tax expense/(benefit) (24) 105 23
Total income tax expense $ 121 $ 189 $ 73