Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 219	$ 1,025
Accounts receivable:
Trade, net	388	436
Due from affiliates	2	4
Income taxes receivable	22	23
Inventories	269	241
Prepaid expenses	16	15
Other current assets:
Derivatives Assets, Current	354	578
Other	35	37
Total current assets	1,305	2,359
Oil and gas properties, using the successful efforts method of accounting:
Proved properties	16,375	15,662
Unproved properties	164	159
Accumulated depletion, depreciation and amortization	(6,044)	(5,431)
Total property, plant and equipment	10,495	10,390
Goodwill	272	272
Property, Plant and Equipment, Net	1,466	1,391
Other assets:
Investment in unconsolidated affiliate	277	239
Derivative Assets, Noncurrent	89	181
Other, net	98	94
Assets, Total	14,002	14,926
Accounts payable:
Trade	771	1,197
Due to affiliates	58	123
Interest payable	62	40
Income taxes payable	0	1
Deferred Tax Liabilities, Net, Current	81	161
Other current liabilities:
Derivative Liabilities, Current	0	3
Other	61	55
Total current liabilities	1,033	1,580
Long-term Debt, Excluding Current Maturities	2,672	2,665
Derivative Liabilities, Noncurrent	1	2
Deferred income taxes	1,714	1,803
Other liabilities	274	287
Stockholders' equity:
Common stock, $.01 par value	2	2
Additional paid-in capital	6,220	6,167
Treasury stock at cost	(202)	(171)
Retained earnings	2,281	2,583
Total equity attributable to common stockholders	8,301	8,581
Noncontrolling interests in consolidating subsidiaries	7	8
Total equity	$ 8,308	$ 8,589
Commitments and contingencies
Liabilities and Stockholders' Equity, Total	$ 14,002	$ 14,926