Insurance and reinsurance - Summary of Insurance Contracts by Remaining Coverage and Incurred Claims (Parenthetical) (Detail) - CAD ($) $ in Millions |
Oct. 31, 2024 |
Oct. 31, 2023 |
Oct. 31, 2022 |
|---|---|---|---|
| Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] | |||
| Insurance contract liabilities | $ 22,231 | $ 19,026 | $ 18,226 |
| Loss component [member] | |||
| Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] | |||
| Insurance contract liabilities | $ 366 | $ 122 |