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Interests in Structured Entities - Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 1,972 $ 2,154
AAA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,181 1,375
AA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 319 227
A    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 378 438
BBB    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 41 107
BB and below    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 53 $ 7
CMBS    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 309  
CMBS | AAA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 309  
CMBS | AA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
CMBS | A    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
CMBS | BBB    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
CMBS | BB and below    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
RMBS    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 5  
RMBS | AAA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 2  
RMBS | AA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
RMBS | A    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 3  
RMBS | BBB    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
RMBS | BB and below    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 0  
ABS    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 1,658  
ABS | AAA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 870  
ABS | AA    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 319  
ABS | A    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 375  
ABS | BBB    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings 41  
ABS | BB and below    
Disclosure of unconsolidated structured entities [Line Items]    
Securitized holdings $ 53