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Income Taxes (Components) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred income taxes $ 185 $ 469
Income tax expense (recovery) 69 520
Income Tax Reconciliation Revaluation Of US Non Regulated Deferred Income Taxes 0 317
Supplemental Tax Information [Abstract]    
Income before provision for income taxes 816 819
Income taxes, at statutory income tax rates 253 254
Canada [Member]    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 3 24
Deferred income taxes 11 3
Operating loss carry forwards (33) (40)
Supplemental Tax Information [Abstract]    
Income before provision for income taxes 127 88
United States [Member]    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes (121) 24
Deferred income taxes 211 384
Operating loss carry forwards 0 (194)
Supplemental Tax Information [Abstract]    
Income before provision for income taxes 646 693
Other [Member]    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 2 3
Deferred income taxes (3) (1)
Operating loss carry forwards (1) 0
Supplemental Tax Information [Abstract]    
Income before provision for income taxes $ 43 $ 38