RETIREMENT BENEFITS - Schedule of Defined Benefit Plans - Expense (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
OPEB
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Service cost	$ 5	$ 5
Interest cost	50	55
Expected return on assets	0	0
Amortization of prior service costs/(credits)	2	2
Net remeasurement (gain)/loss	0	0
Separation costs/other	0	0
Settlements and curtailments	0	0
Net periodic benefit cost/(income)	57	62
U.S. Plans \| Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Service cost	53	52
Interest cost	353	393
Expected return on assets	(449)	(456)
Amortization of prior service costs/(credits)	22	22
Net remeasurement (gain)/loss	0	0
Separation costs/other	0	7
Settlements and curtailments	0	0
Net periodic benefit cost/(income)	(21)	18
Non-U.S. Plans \| Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Service cost	44	48
Interest cost	248	224
Expected return on assets	(295)	(278)
Amortization of prior service costs/(credits)	6	6
Net remeasurement (gain)/loss	(243)	(10)
Separation costs/other	53	24
Settlements and curtailments	15	0
Net periodic benefit cost/(income)	$ (172)	$ 14

Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation.

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- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of defined benefit plan cost (credit), classified as other.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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