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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 2,609 $ 3,229
AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,775 2,346
AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 9 11
A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 590 641
BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 232 227
BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 3 $ 4
CMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 731  
CMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 675  
CMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 56  
RMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 8  
RMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 5  
RMBS [Member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 3  
Asset backed securities [member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,870  
Asset backed securities [member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,095  
Asset backed securities [member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 6  
Asset backed securities [member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 534  
Asset backed securities [member] | BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 232  
Asset backed securities [member] | BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 3