ASSET RETIREMENT OBLIGATIONS Asset Retirement Obligations - Schedule of Changes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				9 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2012 Successor	Mar. 25, 2012 Predecessor	Dec. 31, 2011 Predecessor	Dec. 31, 2010 Predecessor
Beginning balance					$ 41	$ 41	$ 57	$ 58
Incurred			8	34	1	0	1	29
Revisions					3	0	0	(11)
Settled	17	20			(5)	0	(17)	(20)
Accretion expense					2	0	0	1
Ending balance					$ 42	$ 41	$ 41	$ 57