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Employee Future Benefits - Disaggregation of Defined Benefit Obligation (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Pension plans
Disclosure of defined benefit plans [line items]
Defined benefit obligation	$ 3,826	$ 3,789
Retiree welfare plans
Disclosure of defined benefit plans [line items]
Defined benefit obligation	428	450
U.S. plans | Pension plans
Disclosure of defined benefit plans [line items]
Defined benefit obligation	2,500	2,433
U.S. plans | Pension plans | Active members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	578	526
U.S. plans | Pension plans | Inactive and retired members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	1,922	1,907
U.S. plans | Retiree welfare plans
Disclosure of defined benefit plans [line items]
Defined benefit obligation	332	336
U.S. plans | Retiree welfare plans | Active members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	8	9
U.S. plans | Retiree welfare plans | Inactive and retired members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	324	327
Canadian plans | Pension plans
Disclosure of defined benefit plans [line items]
Defined benefit obligation	1,326	1,356
Canadian plans | Pension plans | Active members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	106	116
Canadian plans | Pension plans | Inactive and retired members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	1,220	1,240
Canadian plans | Retiree welfare plans
Disclosure of defined benefit plans [line items]
Defined benefit obligation	96	114
Canadian plans | Retiree welfare plans | Active members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	0	0
Canadian plans | Retiree welfare plans | Inactive and retired members
Disclosure of defined benefit plans [line items]
Defined benefit obligation	$ 96	$ 114

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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- Details

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- Details

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