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Offsetting Financial Assets and Financial Liabilities - Summary of Financial Assets and Liabilities Offsetting, Enforceable Master Netting or Similar Arrangement (Parenthetical) (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Derivative financial instruments [member] |  |
Disclosure of offsetting of financial assets liabilities [line items] |  |
Cash collateral pledged | $ 11,750 | $ 10,847
Non-cash collateral pledged | 2,226 | 718
Derivative financial instruments [member] |  |
Disclosure of offsetting of financial assets liabilities [line items] |  |
Cash collateral received | 4,774 | 4,505
Non-cash collateral | $ 1,009 | $ 1,054

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