Employee Benefits (Summary of Sensitivity of Significant Actuarial Assumptions) (Details) $ in Millions	Oct. 31, 2025 CAD ($)
Actuarial assumption of discount rates [member] \| Principal pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	$ 1,280
1 year/percentage increase in assumption	(1,017)
Actuarial assumption of discount rates [member] \| Principal post-retirement benefit plan [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	53
1 year/percentage increase in assumption	(43)
Actuarial assumption of discount rates [member] \| Other pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	286
1 year/percentage increase in assumption	(237)
Actuarial assumption of expected rates of salary increases [member] \| Principal pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	(240)
1 year/percentage increase in assumption	213
Actuarial assumption of expected rates of salary increases [member] \| Principal post-retirement benefit plan [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	0
1 year/percentage increase in assumption	0
Actuarial assumption of expected rates of salary increases [member] \| Other pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	(23)
1 year/percentage increase in assumption	28
Actuarial assumption of life expectancy after retirement [member] \| Principal pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	(157)
1 year/percentage increase in assumption	152
Actuarial assumption of life expectancy after retirement [member] \| Principal post-retirement benefit plan [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	(11)
1 year/percentage increase in assumption	11
Actuarial assumption of life expectancy after retirement [member] \| Other pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	(76)
1 year/percentage increase in assumption	75
Actuarial assumption of medical cost trend rates [member] \| Principal post-retirement benefit plan [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1 year/percentage decrease in assumption	(7)
1 year/percentage increase in assumption	$ 8

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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 [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 145
-Subparagraph a
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-URIDate 2024-03-27

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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 [domain]]

+ References

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