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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 3,300 $ 3,576
AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 2,471 2,503
AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 306 401
A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 453 504
BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 70 142
BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings   $ 26
CMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,725  
CMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,653  
CMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 72  
RMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 15  
RMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 8  
RMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 7  
Asset backed securities [member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,560  
Asset backed securities [member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 810  
Asset backed securities [member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 306  
Asset backed securities [member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 374  
Asset backed securities [member] | BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 70