Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues	$ 4,153	$ 4,985
Cost of sales:
Production and delivery	2,912	2,737
Depreciation, depletion and amortization	939	966
Impairment of oil and gas properties	3,104	0
Total cost of sales	6,955	3,703
Selling, general and administrative expenses	154	135
Mining exploration and research expenses	33	30
Environmental obligations and shutdown costs	13	6
Net gain on sale of assets	(39)	0
Total costs and expenses	7,116	3,874
Operating (loss) income	(2,963)	1,111
Interest expense, net	(146)	(161)
Other income, net	7	33
(Loss) income before income taxes and equity in affiliated companies' net earnings	(3,102)	983
Benefit from (provision for) income taxes	695	(357)
Equity in affiliated companies’ net earnings	1	0
Net (loss) income	(2,406)	626
Net income attributable to noncontrolling interests	(58)	(106)
Preferred dividends attributable to redeemable noncontrolling interest	(10)	(10)
Net (loss) income attributable to common stockholders	$ (2,474)	$ 510
Net (loss) income per share attributable to common stockholders:
Basic	$ (2.38)	$ 0.49
Diluted	$ (2.38)	$ 0.49
Weighted-average common shares outstanding:
Basic	1,040	1,038
Diluted	1,040	1,044
Dividends declared per share of common stock	$ 0.05	$ 0.3125