RETIREMENT BENEFITS - Assumptions Used (Details)	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
U.S. | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	3.60%	3.85%
Plan Assumptions - At year end
Discount rate	3.55%	3.60%	3.85%
Non-U.S. plans | Pension Plans | Weighted Average
Plan Assumptions - During the year
Discount rate	4.87%	4.83%
Plan Assumptions - At year end
Discount rate	4.86%	4.87%	4.83%
Non-U.S. plans | Pension Plans | Minimum
Plan Assumptions - During the year
Discount rate	0.65%	0.55%
Plan Assumptions - At year end
Discount rate	0.65%	0.65%	0.55%
Non-U.S. plans | Pension Plans | Maximum
Plan Assumptions - During the year
Discount rate	10.90%	10.45%
Plan Assumptions - At year end
Discount rate	10.35%	10.90%	10.45%
Non-U.S. plans | Postretirement Benefit Plans
Plan Assumptions - During the year
Discount rate	9.05%	9.25%
Plan Assumptions - At year end
Discount rate	8.95%	9.05%	9.25%
Qualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	3.80%	4.05%
Plan Assumptions - At year end
Discount rate	3.75%	3.80%	4.05%
Nonqualified plans | U.S. | Pension Plans
Plan Assumptions - During the year
Discount rate	3.75%	3.95%
Plan Assumptions - At year end
Discount rate	3.65%	3.75%	3.95%