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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of insurance contract liabilities and reinsurance assets [abstract]      
Gross insurance contract liabilities $ 313,737 $ 291,767  
Gross benefits payable and provision for unreported claims 4,398 3,376  
Gross policyholder amounts on deposit 10,519 9,462  
Gross insurance contract liabilities 328,654 304,605 $ 297,505
Reinsurance assets (42,925) (30,359)  
Net insurance contract liabilities $ 285,729 $ 274,246