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Derivative Financial Instruments - Summary of Items designated as Hedging Instruments, Hedged Items and Ineffectiveness for Fair Value Hedge (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)
Gain (loss) on hedged item used to calculate hedge ineffectiveness | 2,576 | 5,323
Ineffectiveness recorded in non-interest income-other | (9) | 46
Fair value hedges [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Carrying amount of the hedging instruments, Assets | 1,542 | 2,064
Carrying amount of the hedging instruments, Liabilities | (2,431) | (2,672)
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | 79 | (197)
Gain (loss) on hedged item used to calculate hedge ineffectiveness | (101) | 160
Ineffectiveness recorded in non-interest income-other | (22) | (37)
Carrying amount of the hedged item | 112,421 | 88,293
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item Active hedges | 1,849 | 2,246
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item discontinued hedges | (355) | (1,215)
Fair value hedges [member] | Interest rate risk [member] | Deposit liabilities - carrying amount [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | 906 | 1,955
Gain (loss) on hedged item used to calculate hedge ineffectiveness | (902) | (1,959)
Ineffectiveness recorded in non-interest income-other | 4 | (4)
Carrying amount of the hedged item, Liabilities | (72,001) | (71,363)
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item Active hedges, Liabilities | 90 | 986
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item discontinued hedges, Liabilities | 212 | 446
Fair value hedges [member] | Interest rate risk [member] | Subordinated debenture [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | 62 | 217
Gain (loss) on hedged item used to calculate hedge ineffectiveness | (62) | (216)
Ineffectiveness recorded in non-interest income-other |  | 1
Carrying amount of the hedged item, Liabilities | (4,131) | (4,293)
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item Active hedges, Liabilities | (41) | 21
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item discontinued hedges, Liabilities |  | (1)
Fair value 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 | 1,542 | 2,064
Carrying amount of the hedging instruments, Liabilities | (2,408) | (2,672)
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | 73 | (197)
Gain (loss) on hedged item used to calculate hedge ineffectiveness | (95) | 160
Ineffectiveness recorded in non-interest income-other | (22) | (37)
Fair value hedges [member] | Interest rate risk [member] | Investment securities [Member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | (493) | (1,493)
Gain (loss) on hedged item used to calculate hedge ineffectiveness | 481 | 1,484
Ineffectiveness recorded in non-interest income-other | (12) | (9)
Carrying amount of the hedged item, Assets | 79,836 | 72,595
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item Active hedges, Assets | 1,519 | 1,274
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item discontinued hedges, Assets | (679) | (1,392)
Fair value hedges [member] | Interest rate risk [member] | Loan commitments [member] |  |
Disclosure of detailed information about hedged items and hedging instruments [line items] |  |
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | (402) | (876)
Gain (loss) on hedged item used to calculate hedge ineffectiveness | 388 | 851
Ineffectiveness recorded in non-interest income-other | (14) | (25)
Carrying amount of the hedged item, Assets | 109,149 | 91,354
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item Active hedges, Assets | 287 | (35)
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item discontinued hedges, Assets | 112 | $ (268)
Fair value hedges [member] | Currency or interest rate 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 | (23) |
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | 6 |
Gain (loss) on hedged item used to calculate hedge ineffectiveness | (6) |
Carrying amount of the hedged item, Liabilities | (432) |
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item Active hedges, Liabilities | (6) |
Fair value 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, Liabilities | (23) |
Gain (loss) on hedging instrument used to calculate hedge ineffectiveness | 6 |
Gain (loss) on hedged item used to calculate hedge ineffectiveness | (6) |
Carrying amount of the hedged item, Liabilities | (432) |
Accumulated amount of fair value hedge adjustments gains/(losses) on the hedged item Active hedges, Liabilities | $ (6) |

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- Definition The accumulated amount of fair value hedge adjustment remaining in the statement of financial position for a hedged item that is a financial asset measured at amortised cost and has ceased to be adjusted for hedging gains and losses. [Refer: Financial assets at amortised cost; Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_v&doctype=Standard -URIDate 2024-03-27 + 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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- Definition The gain (loss) on the change in fair value of the hedging instrument 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 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2024-03-27 + Details
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