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Acquisitions and Divestitures - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions, $ in Billions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 06, 2025 CAD ($) | Dec. 27, 2024 CAD ($) shares | Dec. 27, 2024 USD ($) $ / shares shares | Jan. 31, 2026 CAD ($) | Oct. 31, 2025 CAD ($) | Oct. 31, 2025 CAD ($) | Oct. 31, 2024 CAD ($) | Feb. 28, 2025 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Impairment loss on goodwill |  |  |  |  |  | $ 0 |  |
Total Impairment Loss After Tax |  |  |  |  |  | 1,342 |  |
Non Interest Income Credit |  |  |  |  |  | 45 |  |
Total liabilities |  |  |  |  | $ 1,371,455 | 1,371,455 | $ 1,327,951 |
Total assets |  |  |  |  | 1,460,042 | 1,460,042 | 1,412,027 |
Impairment loss on intangible assets |  |  |  |  |  | 0 | 0 |
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax |  |  |  |  |  | 176 | (1) |
Share of profit (loss) of associates and joint ventures accounted for using equity method |  |  |  |  |  | 608 | 198 |
CrediScotia Financiera SA [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  |  | $ 726
Colombia, Costa Rica and Panama [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Impairment loss on goodwill | $ 589 |  |  |  |  |  |  |
Gains (losses) on exchange differences on translation of foreign operations, net of tax |  |  |  |  |  | 249 |  |
Total assets |  |  |  |  |  |  |  | $ 985
Reversal of impairment loss |  |  |  |  |  | 1,422 |  |
Impairment loss on intangible assets | 151 |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment | $ 290 |  |  |  |  |  |  |
Proportion of ownership interest in common share | 14.99% |  |  |  |  |  |  |
Proportion of ownership interest in associate | 20.00% |  |  |  |  |  |  |
Percentage in the tier one ratio | 0.0013 |  |  |  |  |  |  |
After tax impairment loss on disposal of business | $ 1,355 |  |  |  |  |  |  |
Impairment losses | $ 1,362 |  |  |  |  |  |  |
Colombia, Costa Rica and Panama [Member] | Assets and liabilities classified as held for sale [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  | 22,000 | 22,000 |  |
Total assets |  |  |  |  | 24,000 | 24,000 |  |
Other Segment [Member] | CrediScotia Financiera SA [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Share of profit (loss) of associates and joint ventures accounted for using equity method |  |  |  |  | 12 | 102 | $ 90 |
Other Segment [Member] | Colombia, Costa Rica and Panama [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Gains (losses) on exchange differences on translation of foreign operations, net of tax |  |  |  | $ 300 |  |  |  |
KeyCorp [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax |  |  |  |  | 111 | 338 |  |
Share of profit (loss) of associates and joint ventures accounted for using equity method |  |  |  |  | $ 117 | $ 362 |  |
Carrying Amount of Investment In Associates |  | $ 4,100 | $ 2.8 |  |  |  |  |
Additional investment recognized gain (loss) in non-interest income | $ / shares |  |  | $ 17.2 |  |  |  |  |
Cash and cash equivalents in subsidiary or businesses acquired or disposed |  | $ 4,100 | $ 2.8 |  |  |  |  |
Number of Common Share Acquired for Ownership | shares |  | 163 | 163 |  |  |  |  |
Par value per share | $ / shares |  |  | $ 17.17 |  |  |  |  |
Proportion of Initial Investment To Be Acquired In Associates |  |  | 4.90% |  |  |  |  |
Additional proportion of investment to be acquired in associates |  |  | 10.00% |  |  |  |  |
Proportion of ownership interest in associate |  | 14.90% | 14.90% |  |  |  |  |
Percentage in the tier one ratio |  |  | 0.0049 |  |  |  |  |
KeyCorp [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 14.90% | 14.90% |  |  |  |  |

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