Insurance - Summary of Insurance Investment Results (Details) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Apr. 30, 2026 |
Jan. 31, 2026 |
Apr. 30, 2025 |
Apr. 30, 2026 |
Apr. 30, 2025 |
|
| Insurance service result [abstract] | |||||
| Investment return | $ 53 | $ (258) | $ (5) | $ 301 | |
| Insurance finance income (expense) from insurance and reinsurance contracts held | 5 | 261 | 123 | (212) | |
| Movement in investment contract liabilities | (7) | (7) | 9 | (33) | |
| Insurance investment results | $ 51 | $ 76 | $ (4) | $ 127 | $ 56 |