Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues and other income:
Sales and other operating revenues, including related party	$ 870	$ 1,307	$ 1,584	$ 2,587
Marketing revenues	89	183	147	387
Income from equity method investments	37	26	51	62
Net gain (loss) on disposal of assets	294	0	234	1
Other income	12	15	16	26
Total revenues and other income	1,302	1,531	2,032	3,063
Costs and expenses:
Production	350	450	678	894
Marketing, including purchases from related parties	88	182	146	387
Other operating	95	81	204	188
Exploration	189	111	213	201
Depreciation, depletion and amortization	561	751	1,170	1,572
Impairments	0	44	1	44
Taxes other than income	39	78	87	145
General and administrative	132	168	283	339
Total costs and expenses	1,454	1,865	2,782	3,770
Income (loss) from operations	(152)	(334)	(750)	(707)
Net interest and other	(86)	(58)	(171)	(105)
Income (loss) before income taxes	(238)	(392)	(921)	(812)
Provision (benefit) for income taxes	(68)	(6)	(344)	(150)
Net income (loss)	$ (170)	$ (386)	$ (577)	$ (662)
Net income (loss) per share:
Net income (loss), per basic share	$ (0.20)	$ (0.57)	$ (0.73)	$ (0.98)
Net income (loss), per diluted share	(0.20)	(0.57)	(0.73)	(0.98)
Dividends paid, per share	$ 0.05	$ 0.21	$ 0.10	$ 0.42
Weighted average common shares outstanding, basic	848	677	790	676
Weighted average common shares outstanding, diluted	848	677	790	676