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Commitments, Guarantees, Pledged Assets, Provisions and Contingent Liabilities - Summary of Maximum Amounts Payable Under Various Commitments (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Maximum potential amount of future payments $ 322,294 $ 307,633
Financial Guarantees [Member] | Standby letters of credit [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Maximum potential amount of future payments 29,409 30,523
Financial Guarantees [Member] | Credit default swaps [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Maximum potential amount of future payments [1] 23,507 16,211
Other Credit Instruments [Member] | Backstop liquidity facilities [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Maximum potential amount of future payments 18,358 18,224
Other Credit Instruments [Member] | Documentary and commercial letters of credit [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Maximum potential amount of future payments 2,504 1,893
Other Credit Instruments [Member] | Commitments to extend credit [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Maximum potential amount of future payments [2] 238,884 230,689
Other Credit Instruments [Member] | Other commitments [member]    
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items]    
Maximum potential amount of future payments [3] $ 9,632 $ 10,093
[1] The fair value of the related derivatives included in our Consolidated Balance Sheet was $1 million as at October 31, 2025 ($8 million as at October 31, 2024).
[2] Commitments to extend credit exclude personal lines of credit and credit cards that are unconditionally cancellable at our discretion.
[3] Other commitments include $1,664 million as at October 31, 2025 ($4,511 million as at October 31, 2024) of underwriting commitments that are extended but not yet accepted by the borrower.