Fair Value Measurements (Schedule of Reconciliation of Changes in Fair Value for Level 3 Assets and Liabilities) (Parenthetical) (Details) - CAD ($) $ in Millions |
Apr. 30, 2024 |
Feb. 01, 2024 |
Jan. 31, 2024 |
Nov. 01, 2023 |
Oct. 31, 2023 |
Apr. 30, 2023 |
Feb. 01, 2023 |
Jan. 31, 2023 |
Nov. 01, 2022 |
Oct. 31, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] | ||||||||||
| Derivative assets | $ 82,190 | $ 87,382 | ||||||||
| Derivatives | 69,742 | 71,640 | ||||||||
| Netted Derivatives [member] | Level 3 of fair value hierarchy [member] | ||||||||||
| Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] | ||||||||||
| Derivative assets | 20 | $ 10 | $ 10 | $ 22 | 22 | $ 20 | $ 31 | $ 31 | $ 50 | $ 50 |
| Derivatives | $ 192 | $ 186 | $ 186 | $ 176 | $ 176 | $ 217 | $ 239 | $ 239 | $ 234 | $ 234 |