Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues	$ 3,527	$ 4,153
Cost of sales:
Production and delivery	2,725	2,912
Depreciation, depletion and amortization	722	939
Impairment of oil and gas properties	3,787	3,104
Total cost of sales	7,234	6,955
Selling, general and administrative expenses	140	154
Mining exploration and research expenses	19	33
Environmental obligations and shutdown costs	10	13
Net gain on sale of assets	0	(39)
Total costs and expenses	7,403	7,116
Operating loss	(3,876)	(2,963)
Interest expense, net	(200)	(146)
Other income, net	38	7
Loss before income taxes and equity in affiliated companies' net earnings	(4,038)	(3,102)
(Provision for) benefit from income taxes	(70)	695
Equity in affiliated companies’ net earnings	7	1
Net loss	(4,101)	(2,406)
Net income attributable to noncontrolling interests	(72)	(58)
Preferred dividends attributable to redeemable noncontrolling interest	(11)	(10)
Net loss attributable to common stockholders	$ (4,184)	$ (2,474)
Basic and diluted net loss per share attributable to common stockholders	$ (3.35)	$ (2.38)
Basic and diluted weighted-average common shares outstanding	1,251	1,040
Dividends declared per share of common stock	$ 0	$ 0.05