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Derivative and Hedging Instruments - Summary of Recognized Gains Losses on Derivatives and Hedged Items in Fair Value Hedges in Investment Income (Detail) - Fair value hedges [Member] - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items]    
Gains (losses) recognized on derivatives $ 7 $ 4
Gains (losses) recognized for hedged items (5) (2)
Ineffectiveness recognized in investment income 2 2
Foreign currency swaps [Member] | Fixed rate assets [Member]    
Disclosure of detailed information about hedges [Line Items]    
Gains (losses) recognized on derivatives 7 4
Gains (losses) recognized for hedged items (5) (2)
Ineffectiveness recognized in investment income $ 2 $ 2