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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Examination [Line Items]      
Income/(loss) before tax $ (2,599) $ 2,246 $ 2,414
Partnership (earnings)/loss not subject to current Canadian tax 2,221 (1,769) (1,690)
Partnership earnings subject to current Canadian tax $ (378) $ 477 $ 724
Canadian federal and provincial corporate tax rate 24.00% 26.00% 27.00%
Income tax expense/(benefit) at statutory rate $ (91) $ 124 $ 195
Canadian permanent differences and rate changes 72 (61) 0
State income tax 0 3 3
Total income tax expense/(benefit) (19) 66 $ 198
Deferred tax assets:      
Derivative instruments 45 0  
Lease liabilities 39 55  
Net operating losses 2 2  
Other 16 16  
Total deferred tax assets 102 73  
Deferred tax liabilities:      
Property and equipment in excess of tax values (475) (472)  
Derivative instruments 0 (22)  
Lease assets (38) (53)  
Other (3) (5)  
Total deferred tax liabilities (516) (552)  
Net deferred tax liabilities (414) (479)  
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 $ (416) $ (481)