PROPERTY AND EQUIPMENT - Carrying Value of Property and Equipment and Estimated Service Lives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Land	$ 121	$ 127
Buildings and improvements	1,208	1,220
Machinery and equipment	6,675	6,706
Roads	624	609
Other	252	285
Total cost	8,880	8,947
Allowance for depreciation and amortization	(6,294)	(6,324)
Property and equipment, net	$ 2,586	$ 2,623
Minimum | Buildings and Improvements
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years
Minimum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Estimated service lives	2 years
Minimum | Roads
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years
Minimum | Other
Property, Plant and Equipment [Line Items]
Estimated service lives	3 years
Maximum | Buildings and Improvements
Property, Plant and Equipment [Line Items]
Estimated service lives	40 years
Maximum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Estimated service lives	25 years
Maximum | Roads
Property, Plant and Equipment [Line Items]
Estimated service lives	20 years
Maximum | Other
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years