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Derivative and Hedging Instruments - Balances in Net Investment Hedge Reserve (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]    
Total $ 7,327 $ 4,801
Net investment hedges    
Disclosure of detailed information about hedging instruments [line items]    
Balances in the foreign currency translation reserve for continuing hedges (561) 59
Balances remaining in the net investment hedge reserve on de-designated hedges 0 0
Total $ (561) $ 59