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Employee Future Benefits - Additional Information (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of defined benefit plans [line items]
Assets set aside for plan		$ 0
Pension plans
Disclosure of defined benefit plans [line items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024	$ 64
Defined contribution plans
Disclosure of defined benefit plans [line items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024	102
Retiree welfare plans
Disclosure of defined benefit plans [line items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024	$ 18
Canadian plans
Disclosure of defined benefit plans [line items]
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2024		$ 2
Return-Seeking Assets
Disclosure of defined benefit plans [line items]
Target asset allocation for plan		30.00%	30.00%
Return-Seeking Assets | Canada
Disclosure of defined benefit plans [line items]
Target asset allocation for plan		17.00%	17.00%
Liability-Hedging Assets
Disclosure of defined benefit plans [line items]
Target asset allocation for plan		70.00%	70.00%
Liability-Hedging Assets | Canada
Disclosure of defined benefit plans [line items]
Target asset allocation for plan		83.00%	83.00%

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- 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.

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The amount of 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/2009/role/commonPracticeRef
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Defined Benefit Plan Target Asset Allocation Percentage

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