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LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Change in the Reserve for Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Loss Contingencies [Line Items]
Reserve balance as of December 31, 2011	$ 65
Reserve charges and adjustments, net	8
Payments	(10)
Reserve balance as of December 31, 2012	$ 63

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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