Consolidating Financial Statements (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Mar. 22, 2012
Current assets
Cash and cash equivalents	$ 48	$ 63
Accounts receivable
Customer, net of allowance of less than $1	239	158
Other, net of allowance of $2	41	14
Materials and supplies	20	16
Derivative instruments	47	108
Assets of discontinued operations	88	1,034
Prepaid assets	12	10
Total current assets	495	1,403
Property, plant and equipment, at cost
Oil and natural gas properties	8,371	6,513
Other property, plant and equipment	63	52
Total property, plant and equipment, at cost	8,434	6,565
Less accumulated depreciation, depletion and amortization	818	214
Total property, plant and equipment, net	7,616	6,351
Other assets
Investment in unconsolidated affiliate		220
Derivative instruments	97	88
Assets of discontinued operations		93
Unamortized debt issue cost	111	134
Other	7	4
Total other assets	215	539
Total assets	8,326	8,293
Accounts payable
Trade	140	98
Other accrued liabilities	387	302
Derivative instruments	35	17
Accrued interest	54	57
Asset retirement obligations	3	4
Liabilities of discontinued operations	91	211
Other accrued liabilities	65	74
Total current liabilities	775	763
Long-term debt	4,039	4,346
Other long-term liabilities
Derivative instruments		14
Liabilities of discontinued operations		42
Asset retirement obligations	50	40
Other	7	3
Total non-current liabilities	4,096	4,445
Commitments and contingencies
Member's equity	3,455	3,085
Total liabilities and equity	8,326	8,293
Reportable legal entities | Issuer
Current assets
Cash and cash equivalents	15
Accounts receivable
Customer, net of allowance of less than $1	5	6
Other, net of allowance of $2	1
Derivative instruments	47	108
Total current assets	68	114
Other assets
Investment in unconsolidated affiliate	8,142
Investments in consolidated affiliates		7,124
Derivative instruments	97	88
Notes receivable from consolidated affiliate		45
Unamortized debt issue cost	111	134
Total other assets	8,350	7,391
Total assets	8,418	7,505
Accounts payable
Trade	2
Derivative instruments	35	10
Accrued interest	54	57
Other accrued liabilities	1
Total current liabilities	92	67
Long-term debt	4,039	4,346
Notes payable to consolidated affiliate	832
Other long-term liabilities
Derivative instruments		7
Total non-current liabilities	4,871	4,353
Commitments and contingencies
Member's equity	3,455	3,085
Total liabilities and equity	8,418	7,505
Reportable legal entities | Guarantor Subsidiaries
Current assets
Cash and cash equivalents		49	75
Accounts receivable
Customer, net of allowance of less than $1	234	152
Other, net of allowance of $2	40	14
Materials and supplies	20	16
Assets of discontinued operations	30	998
Prepaid assets	12	10
Total current assets	336	1,239
Property, plant and equipment, at cost
Oil and natural gas properties	8,371	6,513
Other property, plant and equipment	63	52
Total property, plant and equipment, at cost	8,434	6,565
Less accumulated depreciation, depletion and amortization	818	214
Total property, plant and equipment, net	7,616	6,351
Other assets
Investment in unconsolidated affiliate		220
Assets of discontinued operations		46
Notes receivable from consolidated affiliate	832
Other	7	4
Total other assets	839	270
Total assets	8,791	7,860
Accounts payable
Trade	138	98
Other accrued liabilities	387	302
Derivative instruments		7
Asset retirement obligations	3	4
Liabilities of discontinued operations		156
Other accrued liabilities	64	74
Total current liabilities	592	641
Notes payable to consolidated affiliate		45
Other long-term liabilities
Derivative instruments		7
Asset retirement obligations	50	40
Other	7	3
Total non-current liabilities	57	95
Commitments and contingencies
Member's equity	8,142	7,124
Total liabilities and equity	8,791	7,860
Reportable legal entities | Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	33	14	12
Accounts receivable
Assets of discontinued operations	85	39
Total current assets	118	53
Other assets
Assets of discontinued operations		93
Total other assets		93
Total assets	118	146
Accounts payable
Liabilities of discontinued operations	91	58
Total current liabilities	91	58
Other long-term liabilities
Liabilities of discontinued operations		42
Total non-current liabilities		42
Commitments and contingencies
Member's equity	27	46
Total liabilities and equity	118	146
Eliminations
Current assets
Cash and cash equivalents			(87)
Accounts receivable
Assets of discontinued operations	(27)	(3)
Total current assets	(27)	(3)
Other assets
Investment in unconsolidated affiliate	(8,142)
Investments in consolidated affiliates		(7,124)
Assets of discontinued operations		(46)
Notes receivable from consolidated affiliate	(832)	(45)
Total other assets	(8,974)	(7,215)
Total assets	(9,001)	(7,218)
Accounts payable
Liabilities of discontinued operations		(3)
Total current liabilities		(3)
Notes payable to consolidated affiliate	(832)	(45)
Other long-term liabilities
Total non-current liabilities	(832)	(45)
Commitments and contingencies
Member's equity	(8,169)	(7,170)
Total liabilities and equity	$ (9,001)	$ (7,218)