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Income Taxes (Components) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred income taxes $ 469 $ (67)
Income tax expense (recovery) 520 (22)
Supplemental Tax Information [Abstract]    
Income before provision for income taxes 819 244
Income taxes, at statutory income tax rates 254 76
Canada [Member]    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 24 13
Deferred income taxes 3 (113)
Operating loss carry forwards (40) (2)
Supplemental Tax Information [Abstract]    
Income before provision for income taxes 88 71
United States [Member]    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 24 18
Deferred income taxes 384 151
Operating loss carry forwards (194) (104)
Supplemental Tax Information [Abstract]    
Income before provision for income taxes 693 44
Other [Member]    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 3 15
Deferred income taxes (1) 0
Supplemental Tax Information [Abstract]    
Income before provision for income taxes $ 38 $ 129