Selected Segment Data - Identifiable Assets by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets	$ 2,649	$ 2,569
Siding
Segment Reporting Information [Line Items]
Assets	1,380	1,319
OSB
Segment Reporting Information [Line Items]
Assets	543	554
LPSA
Segment Reporting Information [Line Items]
Assets	168	145
Other
Segment Reporting Information [Line Items]
Assets	$ 559	$ 551

Amount of asset recognized for present right to economic benefit.

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+ Details