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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Examination [Line Items]      
Income before tax $ 2,246 $ 2,414 $ 902
Partnership earnings not subject to current Canadian tax (1,769) (1,690) (756)
Partnership earnings subject to current Canadian tax $ 477 $ 724 $ 146
Canadian federal and provincial corporate tax rate 26.00% 27.00% 27.00%
Income tax at statutory rate $ 124 $ 195 $ 39
Canadian withholding tax     2
Canadian permanent differences and rate changes (61)   2
State income tax 3 3 1
Total income tax expense 66 198 $ 44
Deferred tax assets:      
Lease liabilities 55 0  
Net operating losses 2 2  
Other 16 21  
Total deferred tax assets 73 23  
Deferred tax liabilities:      
Property and equipment in excess of tax values (472) (449)  
Derivative instruments (22) (31)  
Lease assets (53)    
Other (5) (42)  
Total deferred tax liabilities (552) (522)  
Net deferred tax liabilities (479) (499)  
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 $ (481) $ (501)