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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings CAD 3,576 CAD 3,513
AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 2,503 2,269
AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 401 393
A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 504 592
BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 142 221
BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 26 CAD 38
CMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,418  
CMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,390  
CMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 16  
CMBS [Member] | BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 12  
RMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 45  
RMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 45  
ABS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 2,113  
ABS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,068  
ABS [Member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 401  
ABS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 488  
ABS [Member] | BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 142  
ABS [Member] | BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings CAD 14