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Goodwill, Software and Other Intangible Assets - Schedule of Components of Finite-lived Software and Other Intangible Assets (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | $ 2,830 |
Balance at end of year | 2,894 |
Software [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Net book value | 2,624 | $ 2,515
Software [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | 5,705 |
Additions | 719 |
Disposals | (67) |
Adjustments | 3 |
Balance at end of year | 6,360 |
Software [member] | Accumulated depreciation and amortization [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | (3,190) |
Amortization and impairment | 615 |
Disposals | 67 |
Adjustments | (2) |
Balance at end of year | (3,736) |
Core deposit intangibles [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Net book value | 5 | 10
Core deposit intangibles [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | 53 |
Disposals | (20) |
Adjustments | 1 |
Balance at end of year | 34 |
Core deposit intangibles [member] | Accumulated depreciation and amortization [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | (43) |
Amortization and impairment | 5 |
Disposals | 20 |
Adjustments | 1 |
Balance at end of year | (29) |
Contract based [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Net book value | 1 | 2
Contract based [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | 11 |
Balance at end of year | 11 |
Contract based [member] | Accumulated depreciation and amortization [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | (9) |
Amortization and impairment | 1 |
Balance at end of year | (10) |
Customer relationships [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Net book value | 148 | 187
Customer relationships [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | 381 |
Disposals | (4) |
Adjustments | 1 |
Balance at end of year | 378 |
Customer relationships [member] | Accumulated depreciation and amortization [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | (194) |
Amortization and impairment | 39 |
Disposals | 4 |
Adjustments | 1 |
Balance at end of year | (230) |
Finite Life Intangible Assets [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Net book value | 2,778 | $ 2,714
Finite Life Intangible Assets [Member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | 6,150 |
Additions | 719 |
Disposals | (91) |
Adjustments | 5 |
Balance at end of year | 6,783 |
Finite Life Intangible Assets [Member] | Accumulated depreciation and amortization [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance at beginning of year | (3,436) |
Amortization and impairment | 660 |
Disposals | 91 |
Balance at end of year | $ (4,005) |

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