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		9 Months Ended
Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Net sales	$ 691	$ 663	$ 1,929	$ 2,141
Siding
Disaggregation of Revenue [Line Items]
Net sales	473	443	1,274	1,305
OSB
Disaggregation of Revenue [Line Items]
Net sales	180	179	530	696
Other
Disaggregation of Revenue [Line Items]
Net sales	38	41	125	140
Value-add \| OSB
Disaggregation of Revenue [Line Items]
Net sales	94	105	284	391
Value-add \| Siding \| Siding
Disaggregation of Revenue [Line Items]
Net sales	470	440	1,268	1,298
Commodity \| OSB - Commodity \| OSB
Disaggregation of Revenue [Line Items]
Net sales	83	71	238	295
Other Product Types \| Other \| Siding
Disaggregation of Revenue [Line Items]
Net sales	2	2	6	7
Other Product Types \| Other \| OSB
Disaggregation of Revenue [Line Items]
Net sales	$ 2	$ 3	$ 8	$ 11