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Derivative Instruments - Derivatives Designated As Fair Value Hedging Instruments, Hedged Items and Hedge Ineffectiveness (Detail) - Fair Value Hedges [member] - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
 [1]
Oct. 31, 2024
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Carrying amount of hedging derivatives Asset [2] $ 786 $ 1,464 [3]
Carrying amount of hedging derivatives liabilities [2] (1,926) (1,591) [3]
Gains (Losses) on hedging derivatives used to calculate hedge ineffectiveness (913) (2,032) [3]
Hedge ineffectiveness Gains (Losses) on hedged item used to calculate hedge ineffectiveness 884 1,900 [3]
Ineffectiveness recorded in non-interest revenue - other (29) (132) [3]
Carrying amount of the hedged item [4] 56,606 53,241 [3]
Active hedges 1,386 527 [3]
Discontinued hedges (1,473) (363) [3]
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 derivatives Asset [2] 786 1,464 [3]
Carrying amount of hedging derivatives liabilities [2] (1,926) (1,589) [3]
Cross Currency 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 derivatives Asset [2],[3]   0
Carrying amount of hedging derivatives liabilities [2],[3]   (2)
Securities and loans [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Gains (Losses) on hedging derivatives used to calculate hedge ineffectiveness (1,204) (3,266) [3]
Hedge ineffectiveness Gains (Losses) on hedged item used to calculate hedge ineffectiveness 1,170 3,117 [3]
Ineffectiveness recorded in non-interest revenue - other (34) (149) [3]
Carrying amount of the hedged item [4] 133,830 118,397 [3]
Active hedges 1,747 741 [3]
Discontinued hedges (1,902) (1,293) [3]
Deposits and subordinated debt [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Gains (Losses) on hedging derivatives used to calculate hedge ineffectiveness 291 1,234 [3]
Hedge ineffectiveness Gains (Losses) on hedged item used to calculate hedge ineffectiveness (286) (1,217) [3]
Ineffectiveness recorded in non-interest revenue - other 5 17 [3]
Carrying amount of the hedged item [4] (77,224) (65,156) [3]
Active hedges (361) (214) [3]
Discontinued hedges $ 429 $ 930 [3]
[1] Includes the fair value of bond futures rounded down to $nil million as at October 31, 2025.
[2] Represents the unrealized gains (losses) within derivative instruments in assets and liabilities, respectively, in our Consolidated Balance Sheet.
[3] Includes the fair value of bond futures rounded down to $nil million as at October 31, 2024.
[4] Represents the carrying value in our Consolidated Balance Sheet and includes amortized cost, before ACL, plus fair value hedge adjustments, except for FVOCI securities that are carried at fair value.