Fair value of financial instruments - Summary of Net Interest Income From Financial Instruments (Parenthetical) (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Disclosure of detailed information about financial instruments [line items] | ||
| Insurance premiums, investment and fee income | $ 3,510 | $ 5,600 |
| Dividend income | 2,954 | 2,436 |
| Interest expense on lease liabilities | 112 | 110 |
| Interest income [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Insurance premiums, investment and fee income | 601 | 576 |
| Interest expense [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Insurance premiums, investment and fee income | $ 6 | $ 4 |