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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Examination [Line Items]      
Income/(loss) before tax $ 721 $ (2,599) $ 2,246
Partnership (earnings)/loss not subject to current Canadian tax (370) 2,221 (1,769)
Partnership earnings subject to current Canadian tax $ 351 $ (378) $ 477
Canadian federal and provincial corporate tax rate 24.00% 24.00% 26.00%
Income tax expense/(benefit) at statutory rate $ 84 $ (91) $ 124
Canadian permanent differences and rate changes (13) 72 (61)
State income tax 2 0 3
Total income tax expense/(benefit) 73 (19) $ 66
Deferred tax assets:      
Derivative instruments 39 45  
Lease liabilities 48 39  
Net operating losses 2 2  
Other 17 16  
Total deferred tax assets 106 102  
Deferred tax liabilities:      
Property and equipment in excess of tax values (531) (475)  
Lease assets (47) (38)  
Other (3) (3)  
Total deferred tax liabilities (581) (516)  
Net deferred tax liabilities (475) (414)  
Other long-term assets, net      
Deferred tax liabilities:      
Net deferred tax assets 2 2  
Other long-term liabilities and deferred credits      
Deferred tax liabilities:      
Net deferred tax liabilities $ (477) $ (416)