RETIREMENT BENEFITS - Assumptions Used (Details)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Mar. 31, 2020
U.S. | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	2.45%	3.35%
Plan Assumptions - At period end
Discount rate	2.35%		2.45%	3.20%
Non-U.S. plans | Pension Plans | Weighted Average
Plan Assumptions - During the year
Discount rate	3.68%	4.52%
Plan Assumptions - At period end
Discount rate	3.74%		3.68%	4.38%
Non-U.S. plans | Pension Plans | Minimum
Plan Assumptions - During the year
Discount rate	0.20%	0.30%
Plan Assumptions - At period end
Discount rate	0.05%		0.20%	0.45%
Non-U.S. plans | Pension Plans | Maximum
Plan Assumptions - During the year
Discount rate	8.40%	9.55%
Plan Assumptions - At period end
Discount rate	8.55%		8.40%	9.45%
Non-U.S. plans | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	8.80%	9.70%
Plan Assumptions - At period end
Discount rate	9.00%		8.80%	9.75%
Qualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	2.60%	3.45%
Plan Assumptions - At period end
Discount rate	2.55%		2.60%	3.20%
Nonqualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	2.55%	3.50%
Plan Assumptions - At period end
Discount rate	2.50%		2.55%	3.25%