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Derivative Financial Instruments - Summary of Items designated as Hedging Instruments, Hedged Items and Ineffectiveness for Fair Value Hedges for Cash Flow Hedges and Net Investment Hedges (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | $ 9,290 | $ 8,722
Carrying amount of the hedging instruments, Liabilities | 15,370 | (18,583)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | 2,567 | 5,357
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | 2,576 | 5,323
Ineffectiveness recorded in non-interest income-other | (9) | 46
Cash flow hedges [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 9,244 | 8,312
Carrying amount of the hedging instruments, Liabilities | (8,243) | (10,757)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | 3,928 | 5,241
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | 3,936 | 5,207
Ineffectiveness recorded in non-interest income-other | (9) | 46
Cash flow hedges [member] | Interest rate risk [member] | Swaps [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 1,969 | 1,865
Carrying amount of the hedging instruments, Liabilities | (3,746) | (4,699)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | 171 | 1,775
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | 169 | 1,774
Ineffectiveness recorded in non-interest income-other | (5) | 29
Cash flow hedges [member] | Currency or interest rate risk [member] | Swaps [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 200 | 245
Carrying amount of the hedging instruments, Liabilities | (1,949) | (2,407)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | 173 | 1,363
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | 166 | 1,369
Ineffectiveness recorded in non-interest income-other | 5 | 7
Cash flow hedges [member] | Foreign currency risk [member] | Swaps [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 6,904 | 6,090
Carrying amount of the hedging instruments, Liabilities | (2,541) | (3,650)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | 3,242 | 1,826
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | 3,259 | 1,787
Ineffectiveness recorded in non-interest income-other | (9) | 10
Cash flow hedges [member] | Foreign currency risk [member] | Foreign currency forward contracts [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Liabilities | (7) |
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | (3) | 5
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | (3) | 5
Cash flow hedges [member] | Foreign currency risk [member] | Cash [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 92 | 74
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | (12) | 9
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | (12) | 9
Cash flow hedges [member] | Equity price risk return swap [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 79 | 38
Carrying amount of the hedging instruments, Liabilities |  | (1)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | 357 | 263
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | 357 | 263
Net investment hedges [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 46 | 410
Carrying amount of the hedging instruments, Liabilities | (7,127) | (7,826)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | (1,361) | 116
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | (1,360) | 116
Net investment hedges [member] | Foreign currency risk [member] | Deposit liabilities - carrying amount [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Liabilities | (6,287) | (7,571)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | (67) | (62)
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | (66) | (62)
Net investment hedges [member] | Foreign currency risk [member] | Foreign currency forward contracts [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 46 | 410
Carrying amount of the hedging instruments, Liabilities | (840) | (255)
Gains/(losses) on hedging instrument recognized in Other Comprehensive Income | (1,294) | 178
Gains/(losses) on hedged item used to calculate hedge ineffectiveness | $ (1,294) | $ 178

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- Definition Disclosure of detailed information about hedged items and hedging instruments. + References No definition available. + Details
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- Definition Gain (loss) on hedge ineffectiveness recorded in non-interest income other. + References No definition available. + Details
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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2024-03-27 + Details
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