Fair value of financial instrument - Summary of Net Gains (Losses) From Financial Instruments Classified and 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 detailed information about financial instruments [line items] | ||
| Net fair value gains (losses) on financial liabilities designated as at FVTPL | $ 8,536 | $ (1,408) |
| Insurance [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Fair value gains (losses) previously included in OCI related to financial liabilities derecognized | $ (2,805) | $ (14) |