Fair Value Measurement - Summary of Financial Instruments Carried On Consolidated Balance Sheet at Fair Value (Parenthetical) (Detail) - At fair value [member] - CAD ($) $ in Millions |
Jan. 31, 2023 |
Oct. 31, 2022 |
|---|---|---|
| Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] | ||
| Securities designated at FVTPL | $ 183 | $ 205 |
| Deposits designated at FVTPL | 30,911 | 26,802 |
| Derivative instrument liabilities | 431 | 391 |
| Other liabilities designated at FVTPL | 9 | 22 |
| Other financial liabilities measured at fair value | $ 119 | $ 102 |