Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ 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	$ 722	$ 728	$ 2,261	$ 1,923
Cost of sales	(530)	(514)	(1,591)	(1,489)
Gross Profit	193	214	669	434
Selling, general, and administrative expenses	(75)	(58)	(215)	(191)
Impairment of long-lived assets	0	(1)	0	(25)
Other operating credits and charges, net	(1)	6	2	(20)
Income from operations	116	161	455	198
Non-operating income (expense):
Interest Expense	(4)	(4)	(12)	(9)
Investment income	6	4	17	10
Other non-operating items	(4)	0	2	(17)
Income before income taxes	113	160	462	183
Provision for income taxes	(23)	(44)	(117)	(66)
Equity in unconsolidated affiliate	0	1	12	3
Net income	90	118	358	119
Net income attributed to non-controlling interest	0	0	0	0
Net income attributed to LP	$ 90	$ 118	$ 358	$ 119
Net income attributed to LP per share of common stock:
Net income per share, basic (in dollars per share)	$ 1.28	$ 1.63	$ 5.01	$ 1.65
Net income per share, diluted (in dollars per share)	$ 1.28	$ 1.63	$ 5.00	$ 1.65
Average shares of common stock used to compute net income (loss) per share:
Basic (in shares)	70	72	71	72
Diluted (in shares)	71	72	72	72