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Fair Value Measurement - Valuation Techniques and Quantitative Information About Significant Non-observable Inputs Used In Level 3 Financial Instruments (Detail) - Level 3 of fair value hierarchy [member] $ in Millions | Oct. 31, 2025 CAD ($) | Oct. 31, 2024 CAD ($) | Oct. 31, 2023 CAD ($)
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Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | $ 1,799 | $ 916 | $ 953
Financial liabilities, fair value | (1,619) | (1,499) | (2,116)
Deposits and other liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial liabilities, fair value | (476) | (416) | (242)
Loans measured at FVTPL Business and government [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 75 |  |
Corporate and other debt [member] | Debt securities measured at FVTPL [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 103 |  |
Corporate and other debt [member] | Debt securities measured at FVTPL [member] | Duration [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 103 |  |
Mortgage and asset backed [member] | Debt securities measured at FVTPL [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 392 | 70 | 151
Credit derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial liabilities, fair value | (41) | (50) | (52)
Credit derivatives [member] | Derivative Assets [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 36 | 44 | 46
Equity derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial liabilities, fair value | (29) | (1) | (5)
Equity derivatives [member] | Derivative Assets [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 51 | 6 | 4
Interest rate derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial liabilities, fair value | (1,055) | (1,028) | (1,817)
Interest rate derivatives [member] | Derivative Assets [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 79 | 51 | $ 21
Foreign exchange derivatives [member] | Derivative liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial liabilities, fair value | (18) | $ (4) |
Corporate equity limited partenrship [member] | Equity securities mandatorily measured at FVTPL and designated at FVOCI [Member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial assets, fair value | 1,063 |  |
Deposits designated at FVTPL and net bifurcated embedded derivative liabilities [member] | Deposits and other liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial liabilities, fair value | (468) |  |
Other liabilities designated at FVTPL [member] | Deposits and other liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Financial liabilities, fair value | $ (8) |  |
Bottom of range [member] | Loans measured at FVTPL Business and government [member] | Discounted cash flow [member] | Credit spread [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 2.1 |  |
Bottom of range [member] | Corporate and other debt [member] | Debt securities measured at FVTPL [member] | Discounted cash flow [member] | Duration [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 50.5 |  |
Bottom of range [member] | Mortgage and asset backed [member] | Debt securities measured at FVTPL [member] | Discounted cash flow [member] | Credit spread [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 3.4 |  |
Bottom of range [member] | Credit derivatives [member] | Derivative liabilities [member] | Market approach [member] | Market proxy or direct broker quote [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 36.2 |  |
Bottom of range [member] | Credit derivatives [member] | Derivative Assets [member] | Market approach [member] | Market proxy or direct broker quote [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 36.2 |  |
Bottom of range [member] | Equity derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Market correlation [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 10.9 |  |
Bottom of range [member] | Equity derivatives [member] | Derivative Assets [member] | Option pricing model [member] | Market correlation [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 9.5 |  |
Bottom of range [member] | Interest rate derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Market volatility [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 59.7 |  |
Bottom of range [member] | Interest rate derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Probability of contingent settlement [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 100 |  |
Bottom of range [member] | Interest rate derivatives [member] | Derivative Assets [member] | Option pricing model [member] | Market volatility [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 59.7 |  |
Bottom of range [member] | Interest rate derivatives [member] | Derivative Assets [member] | Option pricing model [member] | Probability of contingent settlement [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 80 |  |
Bottom of range [member] | Foreign exchange derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Probability of contingent settlement [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 100 |  |
Bottom of range [member] | Corporate equity limited partenrship [member] | Equity securities mandatorily measured at FVTPL and designated at FVOCI [Member] | Earnings multiple [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 14.9 |  |
Bottom of range [member] | Deposits designated at FVTPL and net bifurcated embedded derivative liabilities [member] | Deposits and other liabilities [member] | Option pricing model [member] | Market volatility [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 8.3 |  |
Bottom of range [member] | Deposits designated at FVTPL and net bifurcated embedded derivative liabilities [member] | Deposits and other liabilities [member] | Option pricing model [member] | Market correlation [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | (100) |  |
Bottom of range [member] | Other liabilities designated at FVTPL [member] | Deposits and other liabilities [member] | Option pricing model [member] | Funding ratio [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 49 |  |
Top of range [member] | Loans measured at FVTPL Business and government [member] | Discounted cash flow [member] | Credit spread [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 2.1 |  |
Top of range [member] | Corporate and other debt [member] | Debt securities measured at FVTPL [member] | Discounted cash flow [member] | Duration [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 75.7 |  |
Top of range [member] | Mortgage and asset backed [member] | Debt securities measured at FVTPL [member] | Discounted cash flow [member] | Credit spread [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 3.5 |  |
Top of range [member] | Credit derivatives [member] | Derivative liabilities [member] | Market approach [member] | Market proxy or direct broker quote [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 36.2 |  |
Top of range [member] | Credit derivatives [member] | Derivative Assets [member] | Market approach [member] | Market proxy or direct broker quote [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 36.2 |  |
Top of range [member] | Equity derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Market correlation [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 96.4 |  |
Top of range [member] | Equity derivatives [member] | Derivative Assets [member] | Option pricing model [member] | Market correlation [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 96.4 |  |
Top of range [member] | Interest rate derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Market volatility [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 84.7 |  |
Top of range [member] | Interest rate derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Probability of contingent settlement [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 100 |  |
Top of range [member] | Interest rate derivatives [member] | Derivative Assets [member] | Option pricing model [member] | Market volatility [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 84.7 |  |
Top of range [member] | Interest rate derivatives [member] | Derivative Assets [member] | Option pricing model [member] | Probability of contingent settlement [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 100 |  |
Top of range [member] | Foreign exchange derivatives [member] | Derivative liabilities [member] | Option pricing model [member] | Probability of contingent settlement [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 100 |  |
Top of range [member] | Corporate equity limited partenrship [member] | Equity securities mandatorily measured at FVTPL and designated at FVOCI [Member] | Earnings multiple [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, assets | 29.4 |  |
Top of range [member] | Deposits designated at FVTPL and net bifurcated embedded derivative liabilities [member] | Deposits and other liabilities [member] | Option pricing model [member] | Market volatility [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 84.7 |  |
Top of range [member] | Deposits designated at FVTPL and net bifurcated embedded derivative liabilities [member] | Deposits and other liabilities [member] | Option pricing model [member] | Market correlation [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 100 |  |
Top of range [member] | Other liabilities designated at FVTPL [member] | Deposits and other liabilities [member] | Option pricing model [member] | Funding ratio [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items] |  |  |
Significant unobservable input, liabilities | 49 |  |

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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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