CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
REVENUES AND OTHER INCOME
Net sales	$ 12,480	$ 19,312	$ 20,170
Interest, dividends and other income	118	130	107
Gain on sale of equity investments and other assets	101	2,505	1,175
TOTAL REVENUES AND OTHER INCOME	12,699	21,947	21,452
COSTS AND OTHER DEDUCTIONS
Cost of sales (excludes depreciation, depletion, and amortization of $4,540 in 2015, $4,257 in 2014, and $4,197 in 2013)	5,804	6,803	6,497
Selling, general and administrative and other operating expenses	1,270	1,503	1,544
Depreciation, depletion and amortization	4,544	4,261	4,203
Asset impairments and related items	10,239	7,379	621
Taxes other than on income	343	550	564
Exploration expense	36	150	140
Interest and debt expense, net	147	77	132
TOTAL COSTS AND OTHER DEDUCTIONS	22,383	20,723	13,701
Income (loss) before income taxes and other items	(9,684)	1,224	7,751
(Provision for) benefit from domestic and foreign income taxes	1,330	(1,685)	(3,214)
Income from equity investments	208	331	395
Income (loss) from continuing operations	(8,146)	(130)	4,932
Income from discontinued operations	317	760	971
Net income (loss)	(7,829)	630	5,903
Less: Net income attributable to noncontrolling interest		(14)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ (7,829)	$ 616	$ 5,903
BASIC EARNINGS (LOSS) PER COMMON SHARE (attributable to common stock)
Income (loss) from continuing operations (in dollars per share)	$ (10.64)	$ (0.18)	$ 6.12
Discontinued operations, net (in dollars per share)	0.41	0.97	1.21
BASIC EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	(10.23)	0.79	7.33
DILUTED EARNINGS (LOSS) PER COMMON SHARE (attributable to common stock)
Income (loss) from continuing operations (in dollars per share)	(10.64)	(0.18)	6.12
Discontinued operations, net (in dollars per share)	0.41	0.97	1.20
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	(10.23)	0.79	7.32
DIVIDENDS PER COMMON SHARE (in dollars per share)	$ 2.97	$ 2.88	$ 2.56