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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Examination [Line Items]      
Income before tax $ 755 $ 1,006 $ 1,557
Partnership earnings not subject to current Canadian tax (723) (773) (976)
Partnership earnings subject to current Canadian tax $ 32 $ 233 $ 581
Canadian federal and provincial corporate tax rate 27.00% 26.00% 25.00%
Income tax at statutory rate $ 8 $ 61 $ 145
Canadian withholding tax 13 14 16
Canadian permanent differences and rate changes 2 24 9
State income tax 2 1 1
Total income tax expense 25 100 $ 171
Deferred tax assets:      
Derivative instruments 49    
Book accruals in excess of current tax deductions 24 20  
Net operating losses 4 3  
Total deferred tax assets 77 23  
Deferred tax liabilities:      
Derivative instruments   (30)  
Property and equipment in excess of tax values (394) (312)  
Other (41) (41)  
Total deferred tax liabilities (435) (383)  
Net deferred tax liabilities (358) (360)  
Other long-term assets, net      
Deferred tax liabilities:      
Net deferred tax assets 4 3  
Other long-term liabilities and deferred credits      
Deferred tax liabilities:      
Net deferred tax liabilities $ (362) $ (363)