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Employee Future Benefits - Pension and Retiree Welfare Plans (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Pension plans
Disclosure of defined benefit plans [line items]
Opening balance, January 1	$ 124
Return on plan assets (excluding interest income)	(31)	$ 129
Actuarial losses (gains) due to:
Experience	2	11
Demographic assumption changes	0	14
Economic assumption changes	(101)	119
Defined benefit obligation, December 31	50	124
Pension plans | Present value of defined benefit obligation
Disclosure of defined benefit plans [line items]
Opening balance, January 1	3,789	3,794
Current service cost	44	41
Past service cost – amendment	0	0
Interest cost	176	184
Plan participants’ contributions	0	0
Actuarial losses (gains) due to:
Experience	2	11
Demographic assumption changes	0	14
Economic assumption changes	(101)	119
Benefits paid	303	308
Impact of changes in foreign exchange rates	219	(66)
Defined benefit obligation, December 31	3,826	3,789
Pension plans | Plan assets
Disclosure of defined benefit plans [line items]
Opening balance, January 1	(3,706)	(3,722)
Interest cost	(174)	(181)
Plan participants’ contributions	0	0
Return on plan assets (excluding interest income)	(31)	129
Employer contributions	57	59
Actuarial losses (gains) due to:
Benefits paid	(303)	(308)
Impact of changes in foreign exchange rates	(225)	67
Administration costs	(8)	(10)
Defined benefit obligation, December 31	(3,820)	(3,706)
Retiree welfare plans
Disclosure of defined benefit plans [line items]
Opening balance, January 1	(76)
Return on plan assets (excluding interest income)	(19)	17
Actuarial losses (gains) due to:
Experience	(16)	(10)
Demographic assumption changes	0	1
Economic assumption changes	(19)	16
Defined benefit obligation, December 31	(125)	(76)
Retiree welfare plans | Present value of defined benefit obligation
Disclosure of defined benefit plans [line items]
Opening balance, January 1	450	466
Current service cost	0	0
Past service cost – amendment	0	0
Interest cost	21	22
Plan participants’ contributions	2	3
Actuarial losses (gains) due to:
Experience	(16)	(10)
Demographic assumption changes	0	1
Economic assumption changes	(19)	16
Benefits paid	40	38
Impact of changes in foreign exchange rates	30	(10)
Defined benefit obligation, December 31	428	450
Retiree welfare plans | Plan assets
Disclosure of defined benefit plans [line items]
Opening balance, January 1	(526)	(523)
Interest cost	(26)	(25)
Plan participants’ contributions	2	3
Return on plan assets (excluding interest income)	(19)	17
Employer contributions	12	12
Actuarial losses (gains) due to:
Benefits paid	(40)	(38)
Impact of changes in foreign exchange rates	(48)	15
Administration costs	(2)	(1)
Defined benefit obligation, December 31	$ (553)	$ (526)

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2024-01-01
-Paragraph 141
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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

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

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

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

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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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.

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No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

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

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

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

The amount of expense (income) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Post-employment benefit expense in profit or loss, defined benefit plans; Defined benefit plans [domain]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from past service cost]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [domain]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

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Actuarial gains (losses) arising from experience, net defined benefit liability (asset).

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Administration Costs, Net Defined Benefit Liability (Asset)

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