Insurance - Additional Information (Detail) $ in Millions |
12 Months Ended |
|---|---|
|
Oct. 31, 2022
CAD ($)
| |
| Changes in insurance liabilities due to updates to actuarial methods and assumptions [abstract] | |
| Net decrease in insurance liabilities | $ (177) |
| Decrease in insurance liabilities due to revised actuarial reserves on interest rate risk | (225) |
| Increase in insurance liabilities due to insurance risk related assumption updates | 37 |
| Increase in insurance liabilities due to reinsurance contract renegotiations | 9 |
| Increase in insurance liabilities due to valuation system and data changes | $ 2 |