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, 2012	Dec. 31, 2011
Pension
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 2	$ 1
Current liabilities	(21)	(21)
Noncurrent liabilites	(1,534)	(1,107)
Funded status	(1,553)	(1,127)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(37)	(42)
Noncurrent liabilites	(396)	(360)
Funded status	$ (433)	$ (402)