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Commitments, Guarantees, Pledged Assets, Provisions and Contingent Liabilities - Summary of Pledged Assets collateral and Activities (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral $ 430,416 $ 371,350
Bank assets [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 245,657 221,366
Bank assets [member] | Cash and due from banks [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 108 80
Bank assets [member] | Securities [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral [1] 174,514 139,553
Bank assets [member] | Loans [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 59,886 71,419
Bank assets [member] | Other assets [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 11,149 10,314
Third-party Assets [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Collateral received and available for sale or re-pledging [2] 232,840 195,071
Less: Collateral not sold or re-pledged [2] (48,081) (45,087)
Pledged assets and collateral [2] 184,759 149,984
Clearing systems, payment systems and depositories [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 18,136 26,203
Foreign governments and central banks [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 38 46
Obligations related to securities sold short [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 54,876 35,030
Obligations related to securities sold under repurchase agreements [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 119,956 97,878
Securities borrowing and lending [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral [3] 122,729 99,405
Derivative transactions [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 21,870 19,224
Securitization [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 21,873 23,739
Covered bonds [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral 23,125 27,235
Other [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Pledged assets and collateral [4] $ 47,813 $ 42,590
[1] Includes NHA MBS of $6,690 million, which are included in loans in our Consolidated Balance Sheet ($5,492 million as at October 31, 2024).
[2] Includes on-balance sheet securities borrowed or purchased under resale agreements and off-balance sheet collateral received.
[3] Includes off-balance sheet securities borrowing and lending.
[4] Includes $16,734 million of assets that have been pledged to support Federal Home Loan Bank activity ($21,235 million as at October 31, 2024).