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Derivative Instruments - Cash Flow Hedges and Net Investment Hedges Information Related To Items Designated As Hedging Instruments, Hedged Items and Hedge Ineffectiveness (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Cash Flow Hedges [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging instruments, Asset $ 4,536 $ 2,910
Carrying amount of hedging instruments, Liability [1] (2,017) (1,995)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness [2] 1,363 3,466
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness [2] (1,426) (3,529)
Ineffectiveness recorded in non-interest revenue - other 3 (12)
Net Investment Hedges [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging instruments, Asset 4,536 2,910
Carrying amount of hedging instruments, Liability [1] (24,783) (18,352)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness [2] 1,256 3,324
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness [2] (1,321) (3,391)
Ineffectiveness recorded in non-interest revenue - other 1 (16)
Interest rate risk [member] | Cash Flow Hedges [member] | Interest rate swap contract [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging instruments, Asset 2,931 2,148
Carrying amount of hedging instruments, Liability [1] (464) (915)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness [2] 1,319 3,552
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness [2] (1,382) (3,615)
Ineffectiveness recorded in non-interest revenue - other 3 (12)
Foreign exchange risk [member] | Cash Flow Hedges [member] | Cross currency swap [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging instruments, Asset 1,576 699
Carrying amount of hedging instruments, Liability [1] (1,553) (1,080)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness [2] (214) (251)
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness [2] 214 251
Foreign exchange risk [member] | Net Investment Hedges [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging instruments, Liability [1] (22,750) (16,353)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness [2] (102) (119)
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness [2] 102 119
Ineffectiveness recorded in non-interest revenue - other (2)  
Foreign exchange risk [member] | Net Investment Hedges [member] | Cross currency swap [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging instruments, Liability [1] (16) (4)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness [2] (5) (23)
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness [2] 3 19
Ineffectiveness recorded in non-interest revenue - other   (4)
Equity price risk [member] | Cash Flow Hedges [member] | Total Return Swaps [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging instruments, Asset 29 63
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness [2] 258 165
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness [2] $ (258) $ (165)
[1] Represents unrealized gains (losses) recorded as part of derivative instruments in assets and liabilities, respectively, in our Consolidated Balance Sheet.
[2] Represents life to date amounts.