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Income Taxes - Summary of Net Deferred Income Tax Liability (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Balance – beginning of year $ 10,220 $ 10,144 $ 10,539
Deferred income tax (recovery) expense (139) 399 (181)
Deferred income tax expense included in other comprehensive income (loss) 0 1 0
Foreign exchange adjustments 33 (2) (3)
Business combinations 0 (322) (211)
Balance – end of year $ 10,114 $ 10,220 $ 10,144