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Investment Securities - Summary of Equity Investment Securities Designated as at Fair Value Through Other Comprehensive Income (Detail) - Investments in equity instruments designated at fair value through other comprehensive income [member] - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of financial assets [line items] |  |
Cost | $ 178 | $ 2,522
Gross unrealized gains | 221 | 713
Gross unrealized losses | 1 | 73
Fair value | 398 | 3,162
Common shares [member] |  |
Disclosure of financial assets [line items] |  |
Cost | 178 | 2,522
Gross unrealized gains | 221 | 713
Gross unrealized losses | 1 | 73
Fair value | $ 398 | $ 3,162

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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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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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