Derivative financial instruments and hedging activities - Notional Amount of Derivatives by Term to Maturity (Absolute Amounts) (Parenthetical) (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] | ||
| Derivative notional amount | $ 7,776,875 | $ 6,415,878 |
| Debt Syndication Derivatives | 6,000 | 9,000 |
| Credit derivatives [member] | ||
| Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] | ||
| Derivative notional amount | 1,000 | 1,000 |
| Trading credit derivatives protection purchase amount | 26,000 | 25,000 |
| Trading credit derivatives protection sold amount | $ 17,000 | $ 17,000 |