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Deposits - Summary of Deposits and Components (Parenthetical) (Detail) - CAD ($) $ in Millions | Jul. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure Of Deposits [Line items] |  |
Deposit | $ 792,672 | $ 764,857
Purchased notes, net | 200 | 600
Business And Government Deposits [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 448,861 | 435,499
Deposits structured liabilities | 17,200 | 15,500
Payable on fixed date [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 393,457 |
Payable on fixed date [member] | Business And Government Deposits [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 224,905 |
Payable on fixed date [member] | Bank recapitalization (bail-in) conversion regulations [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 65,700 | 61,100
Denominated in U.S. dollars [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 300,400 | 288,400
Denominated in other foreign currencies [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | $ 63,800 | $ 52,900

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