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RETIREMENT BENEFITS - Narrative (Details) - Pension Benefits $ in Millions	6 Months Ended
	Jun. 30, 2026 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future employer contributions	$ 550
Payment for pension benefits	326
Defined Benefit Plan, Underfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future employer contributions	400
Payment for pension benefits	$ 181

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