Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues and other income:
Revenues from contracts with customers	$ 1,538	$ 1,136	$ 4,522	$ 2,911
Net gain (loss) on commodity derivatives	(70)	(22)	(324)	115
Marketing revenues		48		117
Income from equity method investments	64	63	161	183
Net gain (loss) on disposal of assets	16	19	323	26
Other income	119	8	135	31
Total revenues and other income	1,667	1,252	4,817	3,383
Costs and expenses:
Production	215	197	637	528
Marketing, including purchases from related parties		49		121
Shipping, handling and other operating	152	109	408	309
Exploration	56	294	173	352
Depreciation, depletion and amortization	626	641	1,828	1,789
Impairments	8	201	50	205
Taxes other than income	86	44	215	128
General and administrative	101	89	306	276
Total costs and expenses	1,244	1,624	3,617	3,708
Income (loss) from operations	423	(372)	1,200	(325)
Net interest and other	(58)	(35)	(168)	(199)
Other net periodic benefit costs	(8)	(5)	(11)	(16)
Loss on early extinguishment of debt	0	(46)	0	(46)
Income (loss) from continuing operations before income taxes	357	(458)	1,021	(586)
Provision (benefit) for income taxes	103	141	315	216
Income (loss) from continuing operations	254	(599)	706	(802)
Income (loss) from discontinued operations	0	0	0	(4,893)
Net income (loss)	$ 254	$ (599)	$ 706	$ (5,695)
Per basic share:
Income (loss) from continuing operations (in dollars per share)	$ 0.30	$ (0.70)	$ 0.83	$ (0.94)
Income (loss) from discontinued operations (in dollars per share)	0.00	0.00	0.00	(5.76)
Net income (loss) (in dollars per share)	0.30	(0.70)	0.83	(6.70)
Per diluted share:
Income (loss) from continuing operations (in dollars per share)	0.30	(0.70)	0.83	(0.94)
Income (loss) from discontinued operations (in dollars per share)	0.00	0.00	0.00	(5.76)
Net income (loss) (in dollars per share)	$ 0.30	$ (0.70)	$ 0.83	$ (6.70)
Weighted average common shares outstanding:
Basic (in shares)	848	850	852	850
Diluted (in shares)	849	850	853	850