Securities (Summary of Equity Securities Net Realized Gains (Losses) Explanatory) (Details) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2024 |
Apr. 30, 2023 |
Apr. 30, 2024 |
Apr. 30, 2023 |
|
| Equity Securities [member] | ||||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||||
| Fair value | $ 73 | $ 121 | $ 115 | $ 166 |
| Cumulative realized gain/(loss) | (1) | (5) | (1) | (8) |
| FHLB Stock [member] | ||||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||||
| Fair value | 4 | 637 | 163 | 637 |
| Cumulative realized gain/(loss) | $ 0 | $ 0 | $ 0 | $ 0 |