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Income Taxes - Summary of Net Deferred Income Tax Liability (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Balance – beginning of year $ 10,114 $ 10,220 $ 10,144
Deferred income tax expense (recovery) 53 (139) 399
Deferred income tax expense included in other comprehensive (loss) income 0 0 1
Foreign exchange adjustments 16 33 (2)
Business combinations 0 0 (322)
Balance – end of year $ 10,183 $ 10,114 $ 10,220