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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 3,229 $ 3,442
AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 2,346 2,465
AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 11 32
A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 641 661
BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 227 208
BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 4 $ 76
CMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,385  
CMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,332  
CMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 53  
RMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 9  
RMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 6  
RMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 3  
Asset backed securities [member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,835  
Asset backed securities [member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,008  
Asset backed securities [member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 11  
Asset backed securities [member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 585  
Asset backed securities [member] | BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 227  
Asset backed securities [member] | BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 4