QUARTERLY OPERATIONS Quarterly Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended							9 Months Ended	12 Months Ended
	Mar. 25, 2012 Predecessor	Dec. 31, 2011 Predecessor	Mar. 31, 2012 Successor	Dec. 31, 2013 Successor	Sep. 30, 2013 Successor	Jun. 30, 2013 Successor	Mar. 31, 2013 Successor	Dec. 31, 2012 Successor	Sep. 30, 2012 Successor	Jun. 30, 2012 Successor	Dec. 31, 2012 Successor	Dec. 31, 2013 Successor
Operating revenues	$ 194	$ 804	$ 13	$ 190	$ 180	$ 232	$ 199	$ 205	$ 189	$ 185	$ 592	$ 801
Operating income (loss)	88	362	(26)	(611)	71	126	81	89	77	65	205	(333)
Net income	$ 40	$ 168	$ (19)	$ (647)	$ 37	$ 69	$ 42	$ 40	$ 37	$ 30	$ 88	$ (499)