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Insurance Contract Liabilities and Reinsurance Assets - Summary of Components of Gross and Net Insurance Contract Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of insurance contract liabilities and reinsurance assets [abstract]      
Gross insurance contract liabilities $ 374,890 $ 369,230  
Gross benefits payable and provision for unreported claims) 5,251 4,837  
Gross policyholder amounts on deposit 12,134 11,487  
Gross insurance contract liabilities 392,275 385,554 $ 351,161
Reinsurance assets (44,531) (45,769)  
Net insurance contract liabilities $ 347,744 $ 339,785