Loans - Summary of Allowance for Credit Losses (Parenthetical) (Detail) - CAD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Jan. 31, 2023 |
Oct. 31, 2022 |
Jan. 31, 2022 |
|
| Disclosure of detailed information about borrowings [line items] | |||
| Expected credit loss allowance on debt securities classified at amortized cost | $ 14 | $ 15 | $ 12 |
| Stage 3 [member] | Financial assets at amortised cost, class [member] | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Expected credit loss allowance on debt securities classified at amortized cost | $ 12 | $ 12 | $ 10 |