Goodwill and other intangible assets - Summary of Carrying Amount of Other Intangible Assets (Parenthetical) (Detail) - CAD ($) $ in Millions |
Oct. 31, 2024 |
Mar. 28, 2024 |
|---|---|---|
| Disclosure of detailed information about intangible assets [abstract] | ||
| Mutual fund management contracts with indefinite useful lives | $ 259 | $ 259 |