Insurance and reinsurance - Summary of Composition of Insurance Service Result and Insurance Investment Result for Insurance Contracts Issued and Reinsurance Contracts Held (Parenthetical) (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2024 |
Oct. 31, 2023 |
|
| Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] | ||
| Insurance service expenses based on premium allocation approach | $ 4,230 | $ 3,749 |
| Insurance contracts measured using the PAA [member] | ||
| Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] | ||
| Insurance service expenses based on premium allocation approach | $ 948 | $ 840 |