Fair value of financial instruments - Summary of Net Interest Income From Financial Instruments (Parenthetical) (Detail) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2025 |
Apr. 30, 2026 |
Apr. 30, 2025 |
|
| Disclosure of detailed information about financial instruments [line items] | ||||
| Excludes interest and dividend income in Insurance investment result | $ 296 | $ 292 | $ 684 | $ 657 |
| Excludes interest expense in Insurance investment result | 37 | 75 | 76 | 118 |
| Dividend income | $ 835 | $ 1,003 | $ 1,810 | $ 1,999 |