PROPERTY AND EQUIPMENT - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation expense, excluding discontinued operations	$ 206	$ 198	$ 160
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated service lives	15 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated service lives	35 years