CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales (Note 3)	$ 2,506	$ 1,728
Costs of sales	1,430	1,382
Gross margin	1,076	346
Selling expenses	20	22
General and administrative expenses	90	74
Other operating costs, net (Note 15)	10	10
Operating income	956	240
Non-operating pension and other post-employment benefit costs (Note 7)	(8)	(9)
Interest income and other	1	1
Interest expense, net of capitalized interest	(79)	(85)
Earnings before income taxes	870	147
Income taxes (Note 16)	(189)	3
Net earnings	$ 681	$ 150
Earnings per share, basic and diluted (Note 4)	$ 0.91	$ 0.20
Weighted average shares outstanding (in thousands) (Note 4):
Basic	748,718	746,534
Diluted	750,024	747,155