Insurance - Sensitivity Analysis of Insurance Policyholder Liabilities to Reasonably Possible Changes in Actuarial Assumptions (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Disclosure of sensitivity analysis for actuarial assumptions [line items] | ||
| 1% increase in market interest rates impact on net income | $ (10) | $ (14) |
| 1% decrease in market interest rates impact on net income | 5 | 17 |
| 10% increase in equity market values impact on net income | 6 | 8 |
| 10% decrease in equity market values impact on net income | (10) | (10) |
| 5% increase in maintenance expenses impact on net income | (33) | (37) |
| Life insurance [member] | ||
| Life Insurance | ||
| 2% adverse change in annuitant mortality rates impact on net income | (166) | (287) |
| 2% adverse change in assurance mortality rates impact on net income | (59) | (67) |
| 5% adverse change in morbidity rates impact on net income | (181) | (213) |
| 10% adverse change in lapse rates impact on net income | $ (199) | $ (253) |