Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues	$ 4,850	$ 2,798
Cost of sales:
Production and delivery	2,786	2,545
Depreciation, depletion and amortization	419	341
Metals inventory adjustments	1	222
Total cost of sales	3,206	3,108
Selling, general and administrative expenses	100	110
Mining exploration and research expenses	7	16
Environmental obligations and shutdown costs	5	26
Net loss on sales of assets	0	11
Total costs and expenses	3,318	3,271
Operating income (loss)	1,532	(473)
Interest expense, net	(145)	(127)
Net loss on early extinguishment of debt	0	(32)
Other income, net	11	20
Income (loss) before income taxes and equity in affiliated companies’ net (losses) earnings	1,398	(612)
(Provision for) benefit from income taxes	(443)	60
Equity in affiliated companies’ net (losses) earnings	(2)	3
Net income (loss) from continuing operations	953	(549)
Net income	953	(549)
Net income (loss) attributable to noncontrolling interests	235	(58)
Net income (loss) attributable to common stockholders	$ 718	$ (491)
Earnings Per Share, Basic and Diluted [Abstract]
Earnings per share, basic (in dollars per share)	$ 0.49	$ (0.34)
Earnings Per Share, Diluted	$ 0.48	$ (0.34)
Basic weighted-average shares of common stock outstanding	1,462	1,452
Diluted weighted-average shares of common shares outstanding	1,477	1,452
Dividends declared per share of common stock (in dollars per share)	$ 0.075	$ 0