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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income before tax $ 1,006 $ 1,557 $ 1,490
Partnership earnings not subject to current Canadian tax (773) (976) (1,187)
Partnership earnings subject to current Canadian tax $ 233 $ 581 $ 303
Canadian federal and provincial corporate tax rate (as a percent) 26.00% 25.00% 25.00%
Income tax at statutory rate $ 61 $ 145 $ 76
Canadian withholding tax 14 16 19
Canadian permanent differences and rate changes 24 9 3
State income tax 1 1 1
Total income tax expense 100 171 $ 99
Deferred tax assets:      
Book accruals in excess of current tax deductions 20 29  
Net operating losses 3 2  
Total deferred tax assets 23 31  
Deferred tax liabilities:      
Derivative instruments (30) (71)  
Property and equipment in excess of tax values (312) (322)  
Other (41) (49)  
Total deferred tax liabilities (383) (442)  
Net deferred tax liabilities (360) (411)  
Other current liabilities      
Deferred tax liabilities:      
Net deferred tax liabilities   (64)  
Other long-term assets, net      
Deferred tax liabilities:      
Net deferred tax assets 3 2  
Other long-term liabilities and deferred credits      
Deferred tax liabilities:      
Net deferred tax liabilities $ (363) $ (349)