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Risk Management - Schedule of Geographic Concentration of Insurance and Investment Contract Liabilities, Including Embedded Derivatives (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities $ 289,032 $ 277,596
US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 203,621 207,209
Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 85,411 70,387
Gross insurance contract liabilities [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 332,085 307,955
Gross insurance contract liabilities [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 246,255 237,434
Gross insurance contract liabilities [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 85,830 70,521
Reinsurance assets [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities (43,053) (30,359)
Reinsurance assets [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities (42,634) (30,225)
Reinsurance assets [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities $ (419) $ (134)