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IFRS 7 Disclosures - Summary of Account Balances by Investment Category (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees $ 101,566 $ 111,654
Equity funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 43,528 47,508
Balanced funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 41,625 47,369
Bond funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 12,309 13,095
Money market funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 2,107 1,905
Other fixed interest rate investments [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees $ 1,997 $ 1,777