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Income Taxes - Summary of Net Deferred Income Tax Liability (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Balance – beginning of year $ 10,144 $ 10,539 $ 11,451
Deferred income tax expense (recovery) 399 (181) (894)
Deferred income tax expense included in other    comprehensive loss 1 0 8
Foreign exchange adjustments (2) (3) (26)
Business combinations (322) (211) 0
Balance – end of year $ 10,220 $ 10,144 $ 10,539