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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 2,154 $ 2,575
AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,375 1,770
AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 227 9
A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 438 574
BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 107 219
BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 7 $ 3
CMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 425  
CMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 425  
CMBS [Member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
CMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
CMBS [Member] | BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
CMBS [Member] | BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
RMBS [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 7  
RMBS [Member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 4  
RMBS [Member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
RMBS [Member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 3  
RMBS [Member] | BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
RMBS [Member] | BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
Asset backed securities [member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,722  
Asset backed securities [member] | AAA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 946  
Asset backed securities [member] | AA [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 227  
Asset backed securities [member] | A [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 435  
Asset backed securities [member] | BBB [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 107  
Asset backed securities [member] | BB and below [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 7