Fair value of financial instruments - Summary of Net Interest Income From Financial Instruments (Parenthetical) (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2024 |
Oct. 31, 2023 |
|
| Disclosure of detailed information about financial instruments [line items] | ||
| Excludes interest and dividend income in Insurance investment result | $ 958 | $ 677 |
| Excludes interest expense in Insurance investment result | 120 | 191 |
| Dividend income | $ 3,319 | $ 3,215 |