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Commitments and Contingencies - Schedule of Pledged Assets (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt securities [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount CAD 3,818 CAD 5,345
Debt securities [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 3,189 4,678
Debt securities [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 398 409
Debt securities [Member] | Repurchase agreements [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 228 255
Debt securities [Member] | Other [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 3 3
Other [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 815 837
Other [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 44 99
Other [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 86 78
Other [Member] | Real estate [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 2 22
Other [Member] | Non-registered retirement plans in trust [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount 412 464
Other [Member] | Other [Member]    
Disclosure Of Pledged Assets [Line Items]    
Pledged amount CAD 271 CAD 174