RETIREMENT BENEFITS - Assumptions Used (Details)	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Mar. 31, 2021
U.S. | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	2.60%	2.45%
Plan Assumptions - At period end
Discount rate	2.65%		2.60%	2.85%
Non-U.S. plans | Pension Plans | Weighted Average
Plan Assumptions - During the year
Discount rate	4.23%	3.68%
Plan Assumptions - At period end
Discount rate	4.37%		4.23%	4.26%
Non-U.S. plans | Pension Plans | Minimum
Plan Assumptions - During the year
Discount rate	0.25%	0.20%
Plan Assumptions - At period end
Discount rate	0.30%		0.25%	0.25%
Non-U.S. plans | Pension Plans | Maximum
Plan Assumptions - During the year
Discount rate	9.25%	8.40%
Plan Assumptions - At period end
Discount rate	9.55%		9.25%	9.30%
Non-U.S. plans | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	9.50%	8.80%
Plan Assumptions - At period end
Discount rate	9.80%		9.50%	9.70%
Qualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	2.75%	2.60%
Plan Assumptions - At period end
Discount rate	2.80%		2.75%	3.10%
Nonqualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	2.70%	2.55%
Plan Assumptions - At period end
Discount rate	2.75%		2.70%	3.00%