Investments in Associates - Summary of Significant Investments in Associates (Parenthetical) (Detail) - CAD ($) $ in Millions |
9 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 01, 2025 |
Jul. 31, 2026 |
Apr. 30, 2026 |
Oct. 31, 2025 |
Jul. 31, 2025 |
|
| Disclosure of associates [line items] | |||||
| Undistributed retained earnings | $ 80 | $ 77 | $ 76 | $ 75 | |
| Investments in associates based on quoted stock exchange price | 613 | 591 | 617 | ||
| Davivienda Group S.A. [member] | |||||
| Disclosure of associates [line items] | |||||
| Investment property recognised at fair value | 1,370 | ||||
| Proportion of voting rights held in associate | 14.99% | ||||
| Proportion of ownership interest in associate | 20.30% | ||||
| KeyCorp [member] | |||||
| Disclosure of associates [line items] | |||||
| Investments in associates based on quoted stock exchange price | 4,987 | $ 4,793 | $ 4,018 | ||
| Dividends received | $ 45 |