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Risk Management - Schedule of Geographic Concentration of Insurance and Investment Contract Liabilities, Including Embedded Derivatives (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities CAD 277,596 CAD 266,166
US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 207,209 203,809
Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 70,387 62,357
Gross insurance contract liabilities [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 307,955 301,118
Gross insurance contract liabilities [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 237,434 238,796
Gross insurance contract liabilities [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 70,521 62,322
Reinsurance assets [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities (30,359) (34,952)
Reinsurance assets [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities (30,225) (34,987)
Reinsurance assets [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities CAD (134) CAD 35