Consolidating Financial Statements (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	5 Months Ended		12 Months Ended		5 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended	5 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012 Reportable legal entities Issuer	Dec. 31, 2013 Reportable legal entities Issuer	Dec. 31, 2012 Reportable legal entities Guarantor Subsidiaries	Dec. 31, 2013 Reportable legal entities Guarantor Subsidiaries	Dec. 31, 2012 Reportable legal entities Non-Guarantor Subsidiaries	Dec. 31, 2013 Reportable legal entities Non-Guarantor Subsidiaries	Dec. 31, 2012 Eliminations	Dec. 31, 2013 Eliminations	May 24, 2012 Predecessor		Dec. 31, 2011 Predecessor		May 24, 2012 Predecessor Reportable legal entities Guarantor Subsidiaries	Dec. 31, 2011 Predecessor Reportable legal entities Guarantor Subsidiaries	May 24, 2012 Predecessor Reportable legal entities Non-Guarantor Subsidiaries	Dec. 31, 2011 Predecessor Reportable legal entities Non-Guarantor Subsidiaries	May 24, 2012 Predecessor Eliminations	Dec. 31, 2011 Predecessor Eliminations
Operating revenues
Oil and condensate	$ 523	$ 1,283			$ 523	$ 1,283					$ 310		$ 513		$ 310	$ 513
Natural gas	234	331			234	331					228		901		228	901
NGLs	32	78			32	78					29		58		29	58
Financial derivatives	(62)	(52)	(50)	(52)	(12)						365		284		365	284
Total operating revenues	727	1,640	(50)	(52)	777	1,692					932		1,756		932	1,756
Operating expenses
Natural gas purchases	19	25			19	25
Transportation costs	51	92			51	92					45		85		45	85
Lease operating expense	71	163			71	163					80		177		80	177
General and administrative	358	228	206	49	152	179					69		185		68	185	1
Depreciation, depletion and amortization	209	618			209	618					307		579		307	579
Impairment and ceiling test charges	1	2			1	2		34			62		6			6	62
Exploration expense	43	45			43	45
Taxes, other than income taxes	41	86			41	86					31		76		31	76
Total operating expenses	793	1,259	206	49	587	1,210					594		1,108		531	1,108	63
Operating income (loss)	(66)	381	(256)	(101)	190	482					338		648		401	648	(63)
Loss from unconsolidated affiliate	(1)	(13)			(1)	(13)					(5)		(7)		(5)	(7)
Earnings (loss) from consolidated subsidiaries			188	474					(188)	(474)					(63)				63
Other income (expense)		1	1		(1)	1					2		1		2	1
Interest (expense) income
Third party	(218)	(321)									(14)		(9)			(10)		1
Affiliated				(4)		4							(5)			(4)		(1)
Loss on extinguishment of debt	(14)	(9)	(14)	(9)
Interest expense	(218)	(321)	(218)	(321)							(14)				(14)
Income (loss) from continuing operations before income taxes	(299)	39	(299)	39	188	474			(188)	(474)	321		628		321	628	(63)		63
Income tax expense											134		243		134	243
Income (loss) from continuing operations	(299)	39	(299)	39	188	474			(188)	(474)	187		385		187	385	(63)		63
Income (loss) from discontinued operations, net of tax	44	510	44	510	44	510	12	(5)	(56)	(505)	(9)		(123)		(9)	(123)	(8)	(123)	8	123
Net income (loss)											178		262		178	262	(71)	(123)	71	123
Net income (loss)	(255)	549	(255)	549	232	984	12	(5)	(244)	(979)
Cash flow hedging activities:
Reclassification adjustment											3	[1]	7	[1]	3	7
Comprehensive income (loss)	$ (255)	$ 549									$ 181		$ 269		$ 181	$ 269	$ (71)	$ (123)	$ 71	$ 123

[1] Reclassification adjustments are stated net of tax. Taxes recognized for the predecessor periods related to January 1, 2012 to May 24, 2012 and the year ended December 31, 2011 are $2 million and $4 million, respectively.