Fair value of financial instruments - Summary of Net Interest Income From Financial Instruments (Parenthetical) (Detail) - CAD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
|
| Disclosure of detailed information about financial instruments [line items] | ||||
| Excludes interest and dividend income in Insurance investment result | $ 303 | $ 300 | $ 987 | $ 957 |
| Excludes interest expense in Insurance investment result | 40 | 52 | 116 | 170 |
| Dividend income | $ 890 | $ 905 | $ 2,700 | $ 2,904 |