Securities (Summary of Equity Securities Net Realized Gains (Losses) Explanatory) (Details) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2025 |
Apr. 30, 2026 |
Apr. 30, 2025 |
|
| Equity Securities [member] | ||||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||||
| Fair value | $ 118 | $ 62 | $ 209 | $ 126 |
| Cumulative realized gain/(loss) | 29 | (26) | 48 | (20) |
| FHLB stock [member] | ||||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||||
| Fair value | 21 | 219 | 31 | 537 |
| Cumulative realized gain/(loss) | $ 0 | $ 0 | $ 0 | $ 0 |