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Derivative and Hedging Instruments - Summary of Detailed Information about Movement in the Entity Net Investment Hedge Reserve (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2022
Disclosure of Detailed Information About Movement in the Entity Net Investment Hedge Reserve [Line Items]      
Total $ 4,801 $ 5,918 $ 4,578
Hedges of net investment in foreign operations [Member]      
Disclosure of Detailed Information About Movement in the Entity Net Investment Hedge Reserve [Line Items]      
Balances in the foreign currency translation reserve for continuing hedges 59 (137)  
Total $ 59 $ (137)