RETIREMENT BENEFIT PLANS, Health Care Costs Trend Rates (Details)	12 Months Ended
	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate for participants after January 1, 1991	0.00%
Ultimate health care cost trend rate	4.50%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Life insurance cost trend rate	1.00%