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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes      
Income before tax $ 1,490 $ 1,181 $ 1,039
Partnership earnings not subject to current Canadian tax (1,187) (1,046) (909)
Partnership earnings subject to current Canadian tax 303 135 130
Canadian federal and provincial corporate tax rate (as a percent) 25.00% 25.00% 27.00%
Income tax at statutory rate 76 34 35
Canadian withholding taxes 19 18 12
Canadian permanent differences and rate changes 3   (2)
State income tax 1 2  
Total income tax expense 99 54 45
Deferred tax assets:      
Book accruals in excess of current tax deductions 56 28  
Total deferred tax assets 56 28  
Deferred tax liabilities:      
Property and equipment in excess of tax values (398) (397)  
Total deferred tax liabilities (398) (397)  
Net deferred tax liabilities $ (342) $ (369)