RETIREMENT BENEFITS - Contributions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
U.S. plans | Pension plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	$ 57		$ 59
U.S. plans | Postretirement benefit plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	5		8
Non-U.S. plans | Pension plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	90		763
Discretionary contribution		$ 600
Non-U.S. plans | Postretirement benefit plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	$ 10		$ 9