CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 79	$ 48	$ 71	$ 63
Accounts receivable
Customer, net of allowance of less than $1 in 2014 and 2013	278	239
Other, net of allowance of $1 in 2014 and $2 in 2013	23	41
Materials and supplies	22	20
Derivative instruments	16	47
Assets of discontinued operations	73	88
Prepaid assets	9	12
Total current assets	500	495
Property, plant and equipment, at cost
Oil and natural gas properties	8,814	8,371
Other property, plant and equipment	73	63
Total property, plant and equipment, at cost	8,887	8,434
Less accumulated depreciation, depletion and amortization	1,005	818
Total property, plant and equipment, net	7,882	7,616
Other assets
Derivative instruments	49	97
Unamortized debt issue costs	106	111
Other	8	7
Total other assets	163	215
Total assets	8,545	8,326
Accounts payable
Trade	173	140
Other	374	387
Derivative instruments	66	35
Accrued interest	107	54
Asset retirement obligations	3	3
Liabilities of discontinued operations	81	91
Other accrued liabilities	53	65
Total current liabilities	857	775
Long-term debt	4,020	4,039
Other long-term liabilities
Derivative instruments	1
Asset retirement obligations	50	50
Other	9	7
Total non-current liabilities	4,080	4,096
Commitments and contingencies (Note 7)
Member's equity	3,608	3,455
Total liabilities and equity	$ 8,545	$ 8,326