Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net sales	$ 814	$ 611	$ 1,539	$ 1,195
Cost of sales	(551)	(492)	(1,062)	(975)
Gross Profit	263	119	477	220
Selling, general, and administrative expenses	(71)	(66)	(140)	(133)
Loss on impairment	0	(24)	0	(24)
Other operating credits and charges, net	2	(21)	3	(26)
Income from operations	194	8	339	37
Non-operating income (expense):
Interest Expense	(4)	(3)	(8)	(6)
Investment income	6	2	11	7
Other non-operating items	5	(8)	6	(16)
Income (loss) before income taxes	201	(1)	349	22
Provision for income taxes	(53)	(21)	(94)	(22)
Equity in unconsolidated affiliate	12	1	12	1
Net income (loss)	160	(21)	267	1
Net loss attributed to non-controlling interest	0	1	0	0
Net income (loss) attributed to LP	$ 160	$ (20)	$ 267	$ 1
Net income (loss) attributed to LP per share of common stock:
Net income per share, basic (in dollars per share)	$ 2.23	$ (0.28)	$ 3.72	$ 0.02
Net income per share, diluted (in dollars per share)	$ 2.23	$ (0.28)	$ 3.71	$ 0.02
Average shares of common stock used to compute net income (loss) per share:
Basic (in shares)	72	72	72	72
Diluted (in shares)	72	72	72	72