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Risk Management - Summary of Gross Carrying Amount of Financial Instruments Subject to Credit Exposure (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of external credit grades [Line Items]    
Credit exposure CAD 311,782 CAD 316,058
Mortgages [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 44,742 44,193
Private placements [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 32,132 29,729
Policy loans [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 5,808 6,041
Loans to Bank clients [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 1,737 1,745
Derivative Assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 15,569 23,672
Accrued investment income [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 2,182 2,260
Reinsurance assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 30,359 34,952
Other financial assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 5,253 4,844
FVTPL [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 147,024 140,890
AFS [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure CAD 26,976 CAD 27,732