Securities (Summary of Securities Net Realized Gains (Losses)) (Details) - Debt securities [member] - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2024 |
Apr. 30, 2023 |
Apr. 30, 2024 |
Apr. 30, 2023 |
|
| Disclosure of financial assets [line items] | ||||
| Net realized gains (losses) | $ (66) | $ (21) | $ (60) | $ (22) |
| Debt securities at amortized cost [member] | ||||
| Disclosure of financial assets [line items] | ||||
| Net realized gains (losses) | (69) | (36) | (69) | (36) |
| Debt securities at fair value through other comprehensive income [member] | ||||
| Disclosure of financial assets [line items] | ||||
| Net realized gains (losses) | $ 3 | $ 15 | $ 9 | $ 14 |