Fair value of financial instrument - Summary of Liabilities Designated as at Fair Value Through Profit or Loss (Parenthetical) (Detail) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
|
| Disclosure of financial liabilities [line items] | ||
| Fair value gains (losses) previously included in OCI related to financial liabilities derecognized | $ (2,372) | $ (100) |
| Financial liabilities designated as at FVTPL [member] | ||
| Disclosure of financial liabilities [line items] | ||
| Fair value gains (losses) previously included in OCI related to financial liabilities derecognized | 3 | (25) |
| Changes in fair value attributable to changes in credit risk | 97 | 0 |
| Cumulative changes in credit risk | $ 97 | $ 0 |