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Risk Management - Summary of Gross Carrying Amount of Financial Instruments Subject to Credit Exposure (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of external credit grades [Line Items]    
Credit exposure $ 341,933 $ 311,782
Mortgages [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 48,363 44,742
Private placements [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 35,754 32,132
Policy loans [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 6,446 5,808
Loans to Bank clients [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 1,793 1,737
Derivative Assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 13,703 15,569
Accrued investment income [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 2,427 2,182
Reinsurance assets [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 43,053 30,359
Other financial assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 4,800 5,253
FVTPL [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 154,737 147,024
AFS [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure $ 30,857 $ 26,976