PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Effect of a 1 Percent Change in Health Care Costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Effect on total service and interest cost components on 1 percent increase in health care costs (less than)	$ 1
Effect on total service and interest cost components on 1 percent decrease in health care costs (less than)	(1)
Effect on accumulated postretirement benefit obligation on 1 percent increase in health care costs	10
Effect on accumulated postretirement benefit obligation on 1 percent decrease in health care costs	$ (8)