Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net sales	$ 728	$ 852	$ 1,923	$ 3,149
Cost of sales	(514)	(620)	(1,489)	(1,778)
Gross Profit	214	232	434	1,370
Selling, general, and administrative expenses	(58)	(67)	(191)	(196)
Impairment of long-lived assets, net	1	0	25	0
Other operating credits and charges, net	6	7	(20)	17
Income from operations	161	172	198	1,191
Non-operating income (expense):
Interest Expense	(4)	(3)	(9)	(9)
Investment income	4	5	10	8
Other non-operating items	0	(3)	(17)	(11)
Income before income taxes	160	172	183	1,178
Provision for income taxes	(44)	(44)	(66)	(284)
Equity in unconsolidated affiliate	1	1	3	4
Income from continuing operations	118	129	119	898
Income from discontinued operations, net of income taxes	0	97	0	196
Net income	118	226	119	1,093
Net loss attributed to non-controlling interest	0	0	0	1
Net income attributed to LP	$ 118	$ 226	$ 119	$ 1,094
Net income attributed to LP per share of common stock:
Income per share continuing operations - basic (in dollars per share)	$ 1.63	$ 1.75	$ 1.65	$ 11.23
Income per share discontinued operations - basic (in dollars per share)	0	1.32	0	2.45
Net income per share - basic (in dollars per share)	1.63	3.07	1.65	13.67
Income per share continuing operations - diluted (in dollars per share)	1.63	1.74	1.65	11.16
Income per share discontinued operations - diluted (in dollars per share)	0	1.31	0	2.43
Net income per share - diluted (in dollars per share)	$ 1.63	$ 3.05	$ 1.65	$ 13.59
Average shares of common stock used to compute Net income per share:
Basic (in shares)	72	74	72	80
Diluted (in shares)	72	74	72	80