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RETIREMENT BENEFITS - Health Care Cost-Trend Rate (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
U.S. Postretirement Benefit Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Health care cost increase following year (as a percent) 6.50% 7.00%
Ultimate rate to which cost increase is assumed to decline (as a percent) 5.00% 5.00%
Year in which the ultimate rate is reached 2023 2020
Non-U.S. Postretirement Benefit Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Health care cost increase following year (as a percent) 6.86% 6.87%
Ultimate rate to which cost increase is assumed to decline (as a percent) 6.85% 6.36%
Non-U.S. Postretirement Benefit Plans | Minimum    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Year in which the ultimate rate is reached 2017 2016
Non-U.S. Postretirement Benefit Plans | Maximum    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Year in which the ultimate rate is reached 2029 2029