Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES AND OTHER INCOME
Net sales	$ 12,508	$ 10,090	$ 12,480
Interest, dividends and other income	99	106	118
Gains on sale of equity investments and other assets	667	202	101
TOTAL REVENUES AND OTHER INCOME	13,274	10,398	12,699
COSTS AND OTHER DEDUCTIONS
Cost of sales (excludes depreciation, depletion, and amortization of $4,000 in 2017, $4,266 in 2016, and $4,540 in 2015)	5,594	5,189	5,804
Selling, general and administrative and other operating expenses	1,424	1,330	1,270
Depreciation, depletion and amortization	4,002	4,268	4,544
Asset impairments and related items	545	825	10,239
Taxes other than on income	311	277	343
Exploration expense	82	62	36
Interest and debt expense, net	345	292	147
TOTAL COSTS AND OTHER DEDUCTIONS	12,303	12,243	22,383
INCOME (LOSS) BEFORE INCOME TAXES AND OTHER ITEMS	971	(1,845)	(9,684)
(Provision for) benefit from domestic and foreign income taxes	(17)	662	1,330
Income from equity investments	357	181	208
INCOME (LOSS) FROM CONTINUING OPERATIONS	1,311	(1,002)	(8,146)
Income from discontinued operations		428	317
NET INCOME (LOSS)	$ 1,311	$ (574)	$ (7,829)
BASIC EARNINGS (LOSS) PER COMMON SHARE (attributable to common stock)
Income (loss) from continuing operations (in dollars per share)	$ 1.71	$ (1.31)	$ (10.64)
Discontinued operations, net (in dollars per share)		0.56	0.41
BASIC EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	1.71	(0.75)	(10.23)
DILUTED EARNINGS (LOSS) PER COMMON SHARE (attributable to common stock)
Income (loss) from continuing operations (in dollars per share)	1.70	(1.31)	(10.64)
Discontinued operations, net (in dollars per share)		0.56	0.41
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	1.70	(0.75)	(10.23)
DIVIDENDS PER COMMON SHARE (in dollars per share)	$ 3.06	$ 3.02	$ 2.97