RETIREMENT BENEFITS - Contributions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
U.S. | Pension Plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions	$ 14	$ 14
Company contributions (reimbursements) expected to be made during the remainder of the year	43	42
U.S. | Postretirement Benefit Plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions	5	5
Company contributions (reimbursements) expected to be made during the remainder of the year	4	17
Non-U.S. plans | Pension Plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions	136	37
Company contributions (reimbursements) expected to be made during the remainder of the year	344	118
Non-U.S. plans | Postretirement Benefit Plans
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Company contributions	3	2
Company contributions (reimbursements) expected to be made during the remainder of the year	$ 7	$ 6