Employee benefits - Pension and other post-employment benefits - Sensitivity Analysis of Key Assumptions (Detail) $ in Millions	Oct. 31, 2022 CAD ($)
Defined benefit pension plans [member] \| Impact of 100 bps in discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of increase in actuarial assumption	$ (1,348)
Impact of decrease in actuarial assumption	1,649
Defined benefit pension plans [member] \| Impact of 50 bps in rate of increase in future compensation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of increase in actuarial assumption	29
Impact of decrease in actuarial assumption	(31)
Defined benefit pension plans [member] \| Impact of increase in longevity of one additional year [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of increase in actuarial assumption	287
Post employment plan [member] \| Impact of 100 bps in discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of increase in actuarial assumption	(160)
Impact of decrease in actuarial assumption	198
Post employment plan [member] \| Impact of increase in longevity of one additional year [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of increase in actuarial assumption	20
Post employment plan [member] \| Impact of 100 bps in Healthcare cost trend rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of increase in actuarial assumption	57
Impact of decrease in actuarial assumption	$ (48)

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No definition available.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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