PROPERTY AND EQUIPMENT - Carrying Value of Property and Equipment and Estimated Service Lives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 4,868	$ 4,520
Allowance for depreciation and amortization	(3,306)	(3,287)
Property and equipment, net	1,562	1,233
Land
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	90	99
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	789	791
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	3,022	2,811
Roads
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	773	624
Other
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 194	$ 195
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated service lives	15 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated service lives	5 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	35 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	25 years
Maximum | Other
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years