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RETIREMENT BENEFITS - Narrative (Details) - Pension Benefits $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Defined Benefit Plan, Funded Plan |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, expected future employer contributions | $ 750
Contributions paid | 702
Defined Benefit Plan, Underfunded Plan |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, expected future employer contributions | 450
Contributions paid | $ 333

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