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Structured Entities - Schedule of Unconsolidated Structured Entities (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2023
Disclosure of unconsolidated structured entities [line items]      
Cash and cash equivalents $ 67,484 [1] $ 65,098 [1] $ 77,934
Trading Securities 192,303 168,926  
FVTPL Securities 21,354 19,064  
FVOCI Securities 113,209 93,702  
Derivatives 57,151 47,253  
Other 42,884 42,387  
Derivatives 58,729 58,303  
Other 404,000 334,544  
Total assets of the entities 1,476,802 1,409,647  
Customer securitization vehicles [member]      
Disclosure of unconsolidated structured entities [line items]      
Cash and cash equivalents 104 107  
Trading Securities 12 170  
FVTPL Securities 84 40  
FVOCI Securities 1,465 1,484  
Derivatives 3 1  
Other 48 8  
Total assets 1,716 1,810  
Deposits 104 107  
Derivatives 0 3  
Other 0    
Total liabilities 104 110  
Maximum exposure to loss 21,290 [2],[3] 20,998  
Total assets of the entities 12,866 12,956  
Capital vehicles [member]      
Disclosure of unconsolidated structured entities [line items]      
Cash and cash equivalents 4,519 5,536  
Trading Securities 0    
FVTPL Securities 0    
FVOCI Securities 0    
Derivatives 0    
Other 2    
Total assets 4,521 5,536  
Deposits 4,519 5,536  
Derivatives 0    
Other 62 87  
Total liabilities 4,581 5,623  
Maximum exposure to loss 1 1  
Total assets of the entities 4,581 5,624  
Other securitization vehicles [member]      
Disclosure of unconsolidated structured entities [line items]      
Cash and cash equivalents 0    
Trading Securities 32,048 21,485  
FVTPL Securities 0    
FVOCI Securities 0    
Derivatives 0    
Other 181 169  
Total assets 32,229 21,654  
Deposits 0    
Derivatives 0    
Other 0    
Total liabilities 0    
Maximum exposure to loss 32,229 21,654  
Total assets of the entities $ 112,946 $ 87,611  
[1] We are required to maintain reserves or minimum balances with certain central banks, regulatory bodies and counterparties, totalling $108 million as at October 31, 2025 ($80 million as at October 31, 2024).
[2] Maximum exposure to loss represents securities held, undrawn liquidity facilities, any remaining unfunded committed amounts to the BMO funded vehicle, derivative assets and other assets.
[3] Securities held that are issued by our Canadian and U.S. customer securitization vehicles comprise asset-backed commercial paper (ABCP) and are classified as either trading securities, FVTPL securities or FVOCI securities.