Consolidated Condensed Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
REVENUES
Oil and natural gas net sales to third parties	$ 596	$ 630	$ 1,754	$ 678
Oil and natural gas net sales to related parties		421		2,560
Other revenue	30	41	83	115
TOTAL REVENUES	626	1,092	1,837	3,353
COSTS AND OTHER DEDUCTIONS
Production costs	246	271	730	805
General and administrative expenses	129	78	290	218
Depreciation, depletion and amortization	253	304	757	886
Taxes other than on income	42	56	150	163
Exploration expense	5	25	29	71
Interest and debt expense, net	82		244
Other expenses	23	39	74	109
TOTAL COSTS AND OTHER DEDUCTIONS	780	773	2,274	2,252
INCOME / (LOSS) BEFORE INCOME TAXES	(154)	319	(437)	1,101
Income tax (expense) / benefit	50	(131)	165	(444)
NET INCOME / (LOSS)	$ (104)	$ 188	$ (272)	$ 657
Net income / (loss) per share of common stock
Basic (in dollars per share)	$ (0.27)	$ 0.48	$ (0.71)	$ 1.69
Diluted (in dollars per share)	(0.27)	$ 0.48	(0.71)	$ 1.69
Dividends per common share	$ 0.01		$ 0.03