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Commitments and Contingencies - Schedule of Pledged Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt securities [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 4,134 $ 3,818
Debt securities [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 3,655 3,189
Debt securities [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 412 398
Debt securities [Member] | Repurchase agreements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 64 228
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 907 815
Other [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 102 44
Other [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 84 86
Other [Member] | Real estate [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount   2
Other [Member] | Non-registered retirement plans in trust [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 420 412
Other [Member] | Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 301 $ 271