Fair Value Measurement - Changes in Fair Value of Financial Assets and Liabilities in Level 3 (Parenthetical) (Detail) - Level 3 of fair value hierarchy [member] - CAD ($) $ in Millions |
Jan. 31, 2023 |
Oct. 31, 2022 |
Jan. 31, 2022 |
|---|---|---|---|
| Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] | |||
| Deposits | $ 75 | $ 70 | $ 137 |
| Bifurcated embedded derivative liabilities | 344 | 317 | 648 |
| Other liabilities designated at FVTPL | $ 9 | $ 22 | $ 26 |