CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales (Note 3)	$ 1,681	$ 2,022	$ 5,416	$ 5,900
Costs of sales	1,431	1,520	4,407	4,560
Gross margin	250	502	1,009	1,340
Selling expenses	22	22	66	66
General and administrative expenses	122	107	358	316
Other operating costs, net (Note 13)	28	20	41	50
Operating income	78	353	544	908
Non-operating pension and other post-employment benefit costs (Note 6)	(10)	(12)	(31)	(33)
Interest income and other	14	24	43	54
Interest expense, net of capitalized interest	(69)	(72)	(203)	(208)
Earnings before income taxes	13	293	353	721
Income taxes (Note 14)	15	(54)	(38)	(101)
Net earnings	$ 28	$ 239	$ 315	$ 620
Earnings per share, basic (Note 4)	$ 0.04	$ 0.33	$ 0.43	$ 0.85
Earnings per share, diluted (Note 4)	$ 0.04	$ 0.33	$ 0.43	$ 0.85
Weighted average shares outstanding (in thousands) (Note 4):
Basic	727,621	731,046	728,892	732,069
Diluted	728,180	731,742	729,355	732,542