PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Funded Status of Our Pension and Other Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	$ (47)	$ (57)
Pension
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	8	35
Current liabilities	(21)	(22)
Noncurrent liabilities	(1,042)	(233)
Funded status	(1,055)	(220)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(26)	(35)
Noncurrent liabilities	(277)	(283)
Funded status	$ (303)	$ (318)