LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Total	$ 647		$ 683
Less debt issuance costs	(3)		(3)
Less current portion	116		114
Long-term debt, less current portion	$ 531		$ 569
Weighted-average fixed-interest rate	5.70%		5.70%
Weighted-average variable-interest rate	2.10%		1.80%
Repayments of Long-term Debt	$ 36	$ 35
Fixed-rate notes payable due through 2024 [Member]
Debt Instrument [Line Items]
Total	491		$ 520
Variable-rate notes payable due through 2025 [Member]
Debt Instrument [Line Items]
Total	$ 159		$ 166