CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Capital in Excess of Par Value	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss	Common Stock Held in Treasury	Total Stockholders’ Equity	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2014		1,167.0				128.0
Balance at Dec. 31, 2014	$ 22,474	$ 117	$ 22,281	$ 128	$ (544)	$ (3,695)	$ 18,287	$ 4,187
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		205.7
Issuance of common stock	1,936	$ 20	1,916				1,936
Exercised and issued stock-based awards (in shares)		1.0
Exercised and issued stock-based awards	3		3				3
Stock-based compensation, including tax benefit and the tender of shares	90		90			$ (7)	83	7
Stock-based compensation, including tax benefit and the tender of shares (in shares)						0.0
Dividends	(370)			(279)			(279)	(91)
Changes in noncontrolling interests	0		(7)				(7)	7
Net loss attributable to common stockholders	(12,236)			(12,236)			(12,236)
Net income attributable to noncontrolling interests, including discontinued operations	106							106
Other comprehensive (loss) income	41				41		41	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(12,048)
Balance (in shares) at Dec. 31, 2015		1,374.0				128.0
Balance at Dec. 31, 2015	12,044	$ 137	24,283	(12,387)	(503)	$ (3,702)	7,828	4,216
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		197.0
Issuance of common stock	2,366	$ 20	2,346				2,366
Exercised and issued stock-based awards (in shares)		3.0
Exercised and issued stock-based awards	0		0				0
Stock-based compensation, including tax benefit and the tender of shares	55		61			$ (6)	55	0
Stock-based compensation, including tax benefit and the tender of shares (in shares)						1.0
Dividends	(89)			1			1	(90)
Changes in noncontrolling interests	(6)		0				0	(6)
Sale of Candelaria and Ojos del Salado mines	(1,206)		0	0			0	(1,206)
Net loss attributable to common stockholders	(4,154)			(4,154)			(4,154)
Net income attributable to noncontrolling interests, including discontinued operations	290							290
Other comprehensive (loss) income	(43)				(45)		(45)	2
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(4,068)
Balance (in shares) at Dec. 31, 2016		1,574.0				129.0
Balance at Dec. 31, 2016	9,257	$ 157	26,690	(16,540)	(548)	$ (3,708)	6,051	3,206
Tender of shares for stock based awards shares		0.0				0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)		4.0				0.0
Exercised and issued stock-based awards	6	$ 1	5	0	0	$ 0	6	0
Stock-based compensation, including tax benefit and the tender of shares	42	0	56	0	0	$ (15)	41	1
Stock-based compensation, including tax benefit and the tender of shares (in shares)						1.0
Dividends	(173)	0	0	1	0	$ 0	1	(174)
Net loss attributable to common stockholders	1,817	0		1,817		0	1,817	0
Net income attributable to noncontrolling interests, including discontinued operations	278	0				0	0	278
Noncontrolling Interest, Change in Redemption Value			0	0	0
Other comprehensive (loss) income	69	$ 0	0		61	$ 0	61	8
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,164			0
Balance (in shares) at Dec. 31, 2017		1,578.0				130.0
Balance at Dec. 31, 2017	$ 11,296	$ 158	26,751	$ (14,722)	(487)	$ (3,723)	$ 7,977	$ 3,319
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			$ 0		$ 0