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Income Taxes (Composition of taxes on income from continuing operations) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred income taxes $ 381 $ 125
Income tax expense (recovery) 341 61
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes 1,325 771
Canada    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 18 (19)
Deferred income taxes 20 45
Operating loss carry forwards (46) (48)
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes 176 98
United States    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes (58) (46)
Deferred income taxes 426 137
Investment tax credits (10) (9)
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes 1,142 682
Other    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 0 1
Deferred income taxes (9) 0
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes $ 7 $ (9)