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Fair Value of Financial Instruments - Summary of Changes in Level 3 Instruments Carried at Fair Value (Detail) - Level 3 [member] - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | $ 1,934 |
Gains/(losses) recorded in income | [1] | 224 |
Gains/(losses) recorded in OCI |  | 69 |
Purchases/ Issuances |  | 198 |
Sales/ Settlements |  | (407) |
Transfers into/out of Level 3 |  | 193 |
Fair value, ending balance |  | 2,211 | $ 1,934
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 218 |
Derivative financial instruments [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 10 | 15
Gains/(losses) recorded in income | [1] | 81 | (11)
Purchases/ Issuances |  | (7) | 9
Sales/ Settlements |  | 19 | (9)
Transfers into/out of Level 3 |  | 17 | 6
Fair value, ending balance |  | 120 | 10
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 81 |
Obligations related to securities sold short [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | (2) |
Transfers into/out of Level 3 |  | 2 | (2)
Fair value, ending balance |  |  | (2)
Trading assets [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 25 | 20
Gains/(losses) recorded in income | [1] |  | (1)
Purchases/ Issuances |  | 8 | 44
Sales/ Settlements |  | (198) | (22)
Transfers into/out of Level 3 |  | 178 | (16)
Fair value, ending balance |  | 13 | 25
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 1 |
Trading assets [member] | Corporate and other debt [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 4 |
Transfers into/out of Level 3 |  | (4) |
Fair value, ending balance |  |  | 4
Trading assets [member] | Equity securities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 21 |
Purchases/ Issuances |  | 7 |
Sales/ Settlements |  | (19) |
Transfers into/out of Level 3 |  | 3 |
Fair value, ending balance |  | 12 | 21
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 1 |
Trading assets [member] | Trading loans [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Purchases/ Issuances |  | 1 |
Sales/ Settlements |  | (179) |
Transfers into/out of Level 3 |  | 179 |
Fair value, ending balance |  | 1 |
Investment securities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 1,901 | 1,749
Gains/(losses) recorded in income | [1] | 143 | 100
Gains/(losses) recorded in OCI |  | 69 | (25)
Purchases/ Issuances |  | 197 | 251
Sales/ Settlements |  | (228) | (207)
Transfers into/out of Level 3 |  | (4) | 33
Fair value, ending balance |  | 2,078 | 1,901
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 136 |
Investment securities [member] | Corporate and other debt [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 35 |
Gains/(losses) recorded in income | [1] | (5) |
Transfers into/out of Level 3 |  | 2 |
Fair value, ending balance |  | 32 | 35
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | (5) |
Investment securities [member] | Equity securities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 1,866 |
Gains/(losses) recorded in income | [1] | 148 |
Gains/(losses) recorded in OCI |  | 69 |
Purchases/ Issuances |  | 197 |
Sales/ Settlements |  | (228) |
Transfers into/out of Level 3 |  | (6) |
Fair value, ending balance |  | 2,046 | 1,866
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 141 |
Derivative financial assets [member] | Interest rate contracts [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Gains/(losses) recorded in income | [1] | 2 |
Purchases/ Issuances |  | 4 |
Sales/ Settlements |  | (3) |
Fair value, ending balance |  | 3 |
Change in unrealized gains/(losses)recorded in income for instruments still held | [2],[3] | 2 |
Derivative financial assets [member] | Equity contracts [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 44 |
Gains/(losses) recorded in income | [1] | 97 |
Purchases/ Issuances |  | 17 |
Transfers into/out of Level 3 |  | 3 |
Fair value, ending balance |  | 161 | 44
Change in unrealized gains/(losses)recorded in income for instruments still held | [2],[4] | 97 |
Derivative financial assets [member] | Commodity Contracts [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 7 |
Gains/(losses) recorded in income | [1] | 9 |
Fair value, ending balance |  | 16 | 7
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 9 |
Derivative financial assets [member] | Credit Contracts [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | 2 |
Gains/(losses) recorded in income | [1] | (1) |
Purchases/ Issuances |  | 3 |
Fair value, ending balance |  | 4 | 2
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | (1) |
Derivative financial assets [member] | Foreign exchange and gold contracts [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Purchases/ Issuances |  | 2 |
Transfers into/out of Level 3 |  | (1) |
Fair value, ending balance |  | 1 |
Interest rate contracts [member] | Derivative financial liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | (13) |
Gains/(losses) recorded in income | [1] | (10) |
Purchases/ Issuances |  | (5) |
Sales/ Settlements |  | 22 |
Transfers into/out of Level 3 |  | (2) |
Fair value, ending balance |  | (8) | (13)
Change in unrealized gains/(losses)recorded in income for instruments still held | [2],[3] | (10) |
Equity contracts [member] | Derivative financial liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | (19) |
Gains/(losses) recorded in income | [1] | (15) |
Purchases/ Issuances |  | (26) |
Transfers into/out of Level 3 |  | 17 |
Fair value, ending balance |  | (43) | (19)
Change in unrealized gains/(losses)recorded in income for instruments still held | [2],[4] | (15) |
Credit Contracts [member] | Derivative financial liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | (1) |
Gains/(losses) recorded in income | [1] | 1 |
Purchases/ Issuances |  | (2) |
Fair value, ending balance |  | (2) | (1)
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | 1 |
Commodity Contracts [member] | Derivative financial liabilities [member] |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items] |  |  |
Fair value, beginning balance |  | (10) |
Gains/(losses) recorded in income | [1] | (2) |
Fair value, ending balance |  | (12) | $ (10)
Change in unrealized gains/(losses)recorded in income for instruments still held | [2] | $ (2) |
[1] | Gains or losses for items in Level 3 may be offset with losses or gains on related hedges in Level 1 or Level 2.
[2] | These amounts represent the unrealized gains and losses from fair value changes of Level 3 instruments still held at the end of the period that are recorded in the Consolidated Statement of Income.
[3] | Certain unrealized gains and losses on interest rate derivative contracts are largely offset by mark-to-market changes on embedded derivatives on certain deposit liabilities in the Consolidated Statement of Income.
[4] | Certain unrealized gains and losses on derivative assets and liabilities are largely offset by mark-to-market changes on other instruments included in trading revenues in the Consolidated Statement of Income, since these instruments act as an economic hedge to certain derivative assets and liabilities.

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