Fair Value Measurements (Schedule of Transfers Between Fair Value Hierarchy Levels) (Details) - CAD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
|
| Obligations related to securities sold short [member] | ||||
| Disclosure Of Fair Value Measurement Of Assets [Line Items] | ||||
| Transfers out of level 1 to level 2, liabilities | $ 2,010 | $ 3,543 | $ 2,305 | $ 0 |
| Transfers out of Level 2 to Level 1, liabilities | 1,097 | 556 | 874 | 717 |
| Financial Assets At Fair Value Through Other Comprehensive Income [Member] | ||||
| Disclosure Of Fair Value Measurement Of Assets [Line Items] | ||||
| Transfers out of level 1 to level 2, assets | 2 | 111 | 996 | 156 |
| Transfers out of Level 2 to Level 1, assets | 0 | 149 | 514 | 1,653 |
| Trading loans, securities and other [member] | ||||
| Disclosure Of Fair Value Measurement Of Assets [Line Items] | ||||
| Transfers out of level 1 to level 2, assets | 1,613 | 4,599 | 2,071 | 139 |
| Transfers out of Level 2 to Level 1, assets | $ 1,569 | $ 850 | $ 430 | $ 666 |