CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales (Note 3)	$ 2,110	$ 1,671	$ 5,469	$ 5,006
Costs of sales	1,390	1,399	4,055	4,111
Gross margin	720	272	1,414	895
Selling expenses	22	20	62	62
General and administrative expenses	96	85	254	254
Product remediation recoveries (Note 14)	0	(68)	(8)	(68)
Other operating costs, net (Note 16)	92	33	113	85
Operating income	510	202	993	562
Non-operating pension and other postretirement benefit costs (Note 7)	(9)	(15)	(28)	(495)
Interest income and other	2	6	5	22
Interest expense, net of capitalized interest	(111)	(91)	(299)	(289)
Earnings (loss) before income taxes	392	102	671	(200)
Income taxes (Note 17)	(109)	(3)	(166)	138
Net earnings (loss)	$ 283	$ 99	$ 505	$ (62)
Earnings (loss) per share, basic and diluted (Note 4)	$ 0.38	$ 0.13	$ 0.68	$ (0.08)
Weighted average shares outstanding (in thousands) (Note 4):
Basic	746,996	745,626	746,809	745,901
Diluted	748,450	746,514	747,530	745,901