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Income Taxes - Components of Income Tax Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disposal Groups, Including Discontinued Operations [Line Items]      
Current income tax expense $ 56 $ 35 $ 35
Deferred income tax expense (recovery) related to the origination and reversal of temporary differences (145) (95) 22
Deferred income tax expense related to temporary difference on investment in subsidiary 0 9 0
Deferred income tax expense resulting from changes in tax rates or laws expense (recovery) 0 (7) (31)
Write-down (reversal of write-down) of unrecognized deferred income tax assets 134 8 (9)
Current income tax expense 56 35 35
Deferred income tax recovery (11) (85) (18)
Income tax expense (recovery) $ 45 $ (50) $ 17