Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 5,748	$ 3,054	$ 10,598	$ 5,852
Cost of sales:
Production and delivery	3,067	2,394	5,853	4,939
Depreciation, depletion and amortization	483	358	902	699
Metals inventory adjustments	0	(139)	1	83
Total cost of sales	3,550	2,613	6,756	5,721
Selling, general and administrative expenses	87	91	187	201
Mining exploration and research expenses	14	18	21	34
Environmental obligations and shutdown costs	33	11	38	37
Net (gain) loss on sales of assets	(3)	0	(3)	11
Total costs and expenses	3,681	2,733	6,999	6,004
Operating income (loss)	2,067	321	3,599	(152)
Interest expense, net	(148)	(115)	(293)	(242)
Net loss on early extinguishment of debt	0	(9)	0	(41)
Other income, net	9	20	20	40
Income (loss) before income taxes and equity in affiliated companies’ net earnings	1,928	217	3,326	(395)
Provision for income taxes	(603)	(96)	(1,046)	(36)
Equity in affiliated companies’ net earnings	6	3	4	6
Net income (loss) from continuing operations	1,331	124	2,284	(425)
Net income	1,331	124	2,284	(425)
Net income (loss) attributable to noncontrolling interests	248	71	483	13
Net income (loss) attributable to common stockholders	$ 1,083	$ 53	$ 1,801	$ (438)
Earnings Per Share, Basic and Diluted [Abstract]
Earnings per share, basic (in dollars per share)	$ 0.74	$ 0.03	$ 1.23	$ (0.30)
Earnings Per Share, Diluted	$ 0.73	$ 0.03	$ 1.21	$ (0.30)
Basic weighted-average shares of common stock outstanding	1,467	1,453	1,465	1,453
Diluted weighted-average shares of common shares outstanding	1,483	1,458	1,480	1,453
Dividends declared per share of common stock (in dollars per share)	$ 0.075	$ 0	$ 0.15	$ 0