Employee benefits - Pension and other post-employment benefits - Analysis of Movement in Financial Position Related to Pension and Other Post-employment Benefit Plans (Parenthetical) (Detail) - CAD ($) $ in Millions |
Oct. 31, 2022 |
Oct. 31, 2021 |
|---|---|---|
| Defined benefit obligation for plans with funding deficits [member] | ||
| Disclosure of net defined benefit liability (asset) [line items] | ||
| Benefit obligations | $ 323 | $ 413 |
| Fair value of assets for defined benefit plans with funding deficits [member] | ||
| Disclosure of net defined benefit liability (asset) [line items] | ||
| Fair value of plan assets | $ 117 | $ 155 |