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Income Taxes (Composition of Taxes on Income from Continuing Operations) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred income taxes $ 97 $ 152
Income tax expense 128 185
Canada    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 26 25
Deferred income taxes 93 122
Operating loss carry forwards (93) (94)
United States    
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Current income taxes 5 8
Deferred income taxes 128 252
Investment tax credits (29) (7)
Operating loss carry forwards $ (2) $ (121)