RETIREMENT BENEFITS - Assumptions Used (Details)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019
U.S. | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	3.20%	3.80%
Plan Assumptions - At year end
Discount rate	2.45%		3.20%	3.15%
Non-U.S. plans | Pension Plans | Weighted Average
Plan Assumptions - During the year
Discount rate	4.38%	4.74%
Plan Assumptions - At year end
Discount rate	3.68%		4.38%	4.21%
Non-U.S. plans | Pension Plans | Minimum
Plan Assumptions - During the year
Discount rate	0.45%	0.45%
Plan Assumptions - At year end
Discount rate	0.20%		0.45%	0.20%
Non-U.S. plans | Pension Plans | Maximum
Plan Assumptions - During the year
Discount rate	9.45%	10.30%
Plan Assumptions - At year end
Discount rate	8.40%		9.45%	8.95%
Non-U.S. plans | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	9.75%	10.30%
Plan Assumptions - At year end
Discount rate	8.80%		9.75%	9.10%
Qualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	3.20%	3.85%
Plan Assumptions - At year end
Discount rate	2.60%		3.20%	3.25%
Nonqualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	3.25%	3.90%
Plan Assumptions - At year end
Discount rate	2.55%		3.25%	3.25%