POST-EMPLOYMENT BENEFITS - Benefit Plan Costs (Details) - Domestic defined benefit plans - CAD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2025 |
Dec. 31, 2024 |
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| Disclosure of net defined benefit liability (asset) [line items] | ||
| Current service cost | $ 74 | $ 86 |
| Past service cost | 13 | 0 |
| Net interest income | (10) | (8) |
| Net pension expense | 77 | 78 |
| Administrative expense | 3 | 3 |
| Total pension cost recognized in net income | 80 | 81 |
| Plan assets | ||
| Disclosure of net defined benefit liability (asset) [line items] | ||
| Net interest income | (117) | (110) |
| Administrative expense | 3 | 3 |
| Accrued benefit obligation | ||
| Disclosure of net defined benefit liability (asset) [line items] | ||
| Current service cost | 74 | 86 |
| Past service cost | 13 | 0 |
| Net interest income | $ 107 | $ 102 |
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. No definition available.
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- Definition The increase (decrease) in the net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The increase (decrease) in the net defined benefit liability (asset) 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: Net defined benefit liability (asset); Defined benefit plans [domain]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Administrative Expenses, Net Defined Benefit Liability (Asset) No definition available.
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