RETIREMENT BENEFITS - Contributions (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
U.S. plans | Pension plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	$ 43	$ 41
Company contributions expected to be made during the remainder of the year	16	14
U.S. plans | Postretirement benefit plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	0	5
Company contributions expected to be made during the remainder of the year	1	9
Non-U.S. plans | Pension plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	87	417
Company contributions expected to be made during the remainder of the year	25	77
Non-U.S. plans | Postretirement benefit plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions (reimbursements)	7	7
Company contributions expected to be made during the remainder of the year	$ 2	$ 2