Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 663	$ 722	$ 2,141	$ 2,261
Siding
Disaggregation of Revenue [Line Items]
Net sales	443	420	1,305	1,196
OSB
Disaggregation of Revenue [Line Items]
Net sales	179	253	696	917
LPSA
Disaggregation of Revenue [Line Items]
Net sales	39	47	134	140
Other
Disaggregation of Revenue [Line Items]
Net sales	2	2	6	7
Value-add
Disaggregation of Revenue [Line Items]
Net sales	583	599	1,820	1,833
Value-add | Siding
Disaggregation of Revenue [Line Items]
Net sales	440	418	1,298	1,190
Value-add | OSB
Disaggregation of Revenue [Line Items]
Net sales	105	136	391	507
Value-add | LPSA
Disaggregation of Revenue [Line Items]
Net sales	38	46	131	136
Value-add | Other
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Value-add | Siding Solutions
Disaggregation of Revenue [Line Items]
Net sales	443	423	1,313	1,207
Value-add | Siding Solutions | Siding
Disaggregation of Revenue [Line Items]
Net sales	440	418	1,298	1,190
Value-add | Siding Solutions | OSB
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Value-add | Siding Solutions | LPSA
Disaggregation of Revenue [Line Items]
Net sales	3	6	16	17
Value-add | Siding Solutions | Other
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Value-add | OSB - Structural Solutions
Disaggregation of Revenue [Line Items]
Net sales	140	175	507	626
Value-add | OSB - Structural Solutions | Siding
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Value-add | OSB - Structural Solutions | OSB
Disaggregation of Revenue [Line Items]
Net sales	105	136	391	507
Value-add | OSB - Structural Solutions | LPSA
Disaggregation of Revenue [Line Items]
Net sales	35	40	116	119
Value-add | OSB - Structural Solutions | Other
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Commodity | OSB - commodity
Disaggregation of Revenue [Line Items]
Net sales	71	112	295	395
Commodity | OSB - commodity | Siding
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Commodity | OSB - commodity | OSB
Disaggregation of Revenue [Line Items]
Net sales	71	112	295	395
Commodity | OSB - commodity | LPSA
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Commodity | OSB - commodity | Other
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Other | Other products
Disaggregation of Revenue [Line Items]
Net sales	9	11	27	33
Other | Other products | Siding
Disaggregation of Revenue [Line Items]
Net sales	2	3	7	7
Other | Other products | OSB
Disaggregation of Revenue [Line Items]
Net sales	3	5	11	15
Other | Other products | LPSA
Disaggregation of Revenue [Line Items]
Net sales	1	1	3	4
Other | Other products | Other
Disaggregation of Revenue [Line Items]
Net sales	$ 2	$ 2	$ 6	$ 7