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Investment Securities - Summary of Analysis of Fair Value and Carrying Value of Investment Securities Measured at Amortized Cost (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Financial assets at fair value, investment securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost |  | $ 23,239 | $ 28,422
Financial assets at fair value, investment securities [member] | Canadian federal government issued or guaranteed debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost |  | 5,553 | 8,722
Financial assets at fair value, investment securities [member] | U.S. treasury and other U.S. agency debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost |  | 15,178 | 17,440
Financial assets at fair value, investment securities [member] | Other foreign government debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost |  | 2,285 | 2,044
Financial assets at fair value, investment securities [member] | Corporate debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost |  | 223 | 216
Financial assets at carrying value, investment securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost | [1] | 23,722 | 29,412
Financial assets at carrying value, investment securities [member] | Canadian federal government issued or guaranteed debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost | [1] | 5,467 | 8,721
Financial assets at carrying value, investment securities [member] | U.S. treasury and other U.S. agency debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost | [1] | 15,758 | 18,440
Financial assets at carrying value, investment securities [member] | Other foreign government debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost | [1] | 2,281 | 2,041
Financial assets at carrying value, investment securities [member] | Corporate debt [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Cost | [1] | $ 216 | $ 210
[1] | Balances are net of allowances, which are $1 (2024 – $1).

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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_f&doctype=Standard -URIDate 2024-03-27 + Details
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