CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Other Comprehensive Loss	Common Stock Held in Treasury	Total Stockholders’ Equity	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2015		1,374				128
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
Issuance of common stock	2,366	$ 20	2,346				2,366
Exercised and issued stock-based awards (in shares)		3
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
Dividends	(89)			1			1	(90)
Changes in noncontrolling interests	(6)		0				0	(6)
Sale of Candelaria and Ojos del Salado mines	(1,206)							(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				129
Balance at Dec. 31, 2016	9,257	$ 157	26,690	(16,540)	(548)	$ (3,708)	6,051	3,206
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)		4
Exercised and issued stock-based awards	6	$ 1	5				6
Stock-based compensation, including tax benefit and the tender of shares	42		56			$ (15)	41	1
Stock-based compensation, including tax benefit and the tender of shares (in shares)						1
Dividends	(173)			1			1	(174)
Net loss attributable to common stockholders	1,817			1,817			1,817
Net income attributable to noncontrolling interests, including discontinued operations	278							278
Other comprehensive (loss) income	69				61		61	8
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,164
Balance (in shares) at Dec. 31, 2017		1,578				130
Balance at Dec. 31, 2017	11,296	$ 158	26,751	(14,722)	(487)	$ (3,723)	7,977	3,319
Tender of shares for stock based awards shares		0				0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)		1				0
Exercised and issued stock-based awards	8	$ 0	8	0	0	$ 0	8	0
Stock-based compensation, including tax benefit and the tender of shares	66	0	70	0	0	$ (4)	66	0
Stock-based compensation, including tax benefit and the tender of shares (in shares)						0
Dividends	(569)	0	(291)	0	0	$ 0	(291)	(278)
Net loss attributable to common stockholders	2,602	0		2,602		0	2,602	0
Net income attributable to noncontrolling interests, including discontinued operations	(292)	0				0	0	(292)
Noncontrolling Interest, Change in Redemption Value			0	0	0
Other comprehensive (loss) income	(34)	$ 0	0		(33)	$ 0	(33)	(1)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,860			0
Balance (in shares) at Dec. 31, 2018		1,579				130
Balance at Dec. 31, 2018	17,892	$ 158	26,013	(12,041)	(605)	$ (3,727)	9,798	8,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Increase from Sale of Parent Equity Interest	4,231		(525)		(6)		(531)	$ 4,762
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			$ 0		0
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0			$ 79	$ (79)		$ 0