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Income Taxes (Composition of taxes on income from continuing operations) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred income taxes $ 152 $ (37)
Income tax expense 185 (6)
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes 1,194 555
Canada    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 25 20
Deferred income taxes 120 (33)
Operating loss carry forwards (92) (64)
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes 173 244
United States    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 8 11
Deferred income taxes 252 118
Investment tax credits (7) (11)
Operating loss carry forwards (121) (49)
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes 1,063 289
Other    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred income taxes 0 2
Supplemental Tax Information [Abstract]    
Income (loss) before provision for income taxes $ (42) $ 22