Operating Segments - Schedule of Operating Segments (Parenthetical) (Detail) - CAD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jul. 31, 2026 |
Apr. 30, 2026 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
|
| Canadian banking [member] | |||||
| Disclosure of operating segments [line items] | |||||
| Net income from investments in associated corporations | $ (3) | $ (2) | $ (2) | $ (14) | $ 20 |
| International banking [member] | |||||
| Disclosure of operating segments [line items] | |||||
| Net income from investments in associated corporations | 65 | 65 | 39 | 178 | 112 |
| Other smaller operating segments and corporate adjustments [member] | |||||
| Disclosure of operating segments [line items] | |||||
| Net income from investments in associated corporations | 159 | $ 159 | $ 120 | 468 | $ 297 |
| Global banking and markets [member] | |||||
| Disclosure of operating segments [line items] | |||||
| Net income from investments in associated corporations | $ 1 | $ 1 | |||