CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 7,532	$ 6,554	$ 7,476
Costs of sales	5,447	5,412	5,592
Gross margin	2,085	1,142	1,884
Selling expenses	83	84	88
General and administrative expenses	347	348	318
Charges for integration and restructuring, closures and asset impairments (Note 4)	1	80	2
Product remediation recoveries, net (Note 18)	(8)	(68)	0
Gain on sale of timberlands (Note 4)	(182)	(48)	0
Other operating costs, net (Note 19)	134	95	82
Operating income	1,710	651	1,394
Non-operating pension and other post-employment benefit costs (Note 9)	(290)	(516)	(272)
Interest income and other	5	30	60
Interest expense, net of capitalized interest	(443)	(378)	(375)
Earnings (loss) before income taxes	982	(213)	807
Income taxes (Note 20)	(185)	137	(59)
Net earnings (loss)	$ 797	$ (76)	$ 748
Basic and diluted earnings (loss) per share (Note 5):	$ 1.07	$ (0.10)	$ 0.99
Weighted average shares outstanding (in thousands) (Note 5):
Basic	746,931	745,897	754,556
Diluted	747,899	745,897	756,827