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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Examination [Line Items]      
Income before tax $ 1,280 $ 1,623 $ 1,417
Partnership earnings not subject to Canadian tax (837) (1,136) (686)
Partnership earnings subject to Canadian tax $ 443 $ 487 $ 731
Canadian federal and provincial corporate tax rate 24.00% 24.00% 24.00%
Income tax expense at statutory rate $ 106 $ 117 $ 175
Canadian withholding tax 52    
Canadian permanent differences 7 2 13
State income tax 2 2 1
Total income tax expense 167 121 $ 189
Deferred tax assets:      
Derivative instruments 19 0  
Lease liabilities 46 40  
Other 43 45  
Total deferred tax assets 108 85  
Deferred tax liabilities:      
Property and equipment in excess of tax values (525) (573)  
Derivative instruments 0 (6)  
Lease assets (44) (38)  
Other (3) (3)  
Total deferred tax liabilities (572) (620)  
Net deferred tax liabilities (464) (535)  
Other long-term liabilities and deferred credits      
Deferred tax liabilities:      
Other long-term liabilities and deferred credits $ (464) $ (535)