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Income Taxes (Composition of taxes on income from continuing operations) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Deferred income taxes $ 125 $ 185  
Income tax expense (recovery) 61 69  
Supplemental Tax Information [Abstract]      
Income before provision for income taxes 771 816  
Canada      
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current income taxes (19) 3  
Deferred income taxes 45 11  
Operating loss carry forwards (48) (33)  
Supplemental Tax Information [Abstract]      
Income before provision for income taxes 98 127 $ 127
United States      
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current income taxes (46) (121)  
Deferred income taxes 137 215  
Investment tax credits (9) (4)  
Operating loss carry forwards 0 0  
Revaluation of US non-regulated deferred income taxes due to tax reform 0 0  
Supplemental Tax Information [Abstract]      
Income before provision for income taxes 682 646 646
Other      
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current income taxes 1 2  
Deferred income taxes 0 (4)  
Operating loss carry forwards 0 0  
Supplemental Tax Information [Abstract]      
Income before provision for income taxes $ (9) $ 43 $ 43