PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Effect of a 1 Percent Change in Health Care Costs (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
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	14
Effect on accumulated postretirement benefit obligation on 1 percent decrease in health care costs	$ (12)