Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Net sales	$ 664	$ 755	$ 1,239	$ 1,478
Siding
Disaggregation of Revenue [Line Items]
Net sales	441	460	801	862
OSB
Disaggregation of Revenue [Line Items]
Net sales	182	250	350	517
Other
Disaggregation of Revenue [Line Items]
Net sales	41	45	87	99
Value-add \| OSB
Disaggregation of Revenue [Line Items]
Net sales	97	143	190	286
Value-add \| Siding \| Siding
Disaggregation of Revenue [Line Items]
Net sales	439	458	798	857
Commodity \| OSB - Commodity \| OSB
Disaggregation of Revenue [Line Items]
Net sales	82	104	155	224
Other Product Types \| Other \| Siding
Disaggregation of Revenue [Line Items]
Net sales	2	2	3	5
Other Product Types \| Other \| OSB
Disaggregation of Revenue [Line Items]
Net sales	$ 2	$ 3	$ 5	$ 7