Current And Future Changes In Accounting Policies (Narrative) (Details) - CAD ($) $ in Millions |
Apr. 30, 2024 |
Oct. 31, 2023 |
Oct. 31, 2022 |
|---|---|---|---|
| Disclosure of initial application of standards or interpretations [line items] | |||
| Deferred tax assets | $ 4,806 | $ 3,951 | |
| Retained earnings | 71,904 | 73,008 | |
| Accumulated other comprehensive income (loss) | $ 4,166 | 2,750 | |
| IFRS 17 [member] | Increase (decrease) due to changes in accounting policy required by IFRS [member] | |||
| Disclosure of initial application of standards or interpretations [line items] | |||
| Accumulated other comprehensive income (loss) | $ 10 | ||
| IFRS 17 [member] | Transition adjustment [member] | |||
| Disclosure of initial application of standards or interpretations [line items] | |||
| Deferred tax assets | $ (60) | ||
| Retained earnings | $ 112 |