Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 588.0	$ 811.0	$ 1,170.0	$ 1,502.0
Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	238.0	262.0	474.0	489.0
OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	199.0	387.0	407.0	701.0
EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	107.0	113.0	197.0	219.0
South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	40.0	45.0	85.0	88.0
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.0	3.0	10.0	6.0
Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	(2.0)	0.0	(4.0)	0.0
SmartSide Strand siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	204.0	200.0	397.0	372.0
SmartSide Strand siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	200.0	194.0	387.0	359.0
SmartSide Strand siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Strand siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Strand siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	4.0	7.0	10.0	14.0
SmartSide Strand siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Strand siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	25.0	28.0	51.0	54.0
SmartSide Fiber siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	25.0	28.0	51.0	54.0
SmartSide Fiber siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
CanExel siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	7.0	13.0	24.0	26.0
CanExel siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	7.0	13.0	24.0	26.0
CanExel siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
CanExel siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
CanExel siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
CanExel siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
CanExel siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
OSB - commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues	101.0	249.0	212.0	442.0
OSB - commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.0	12.0	8.0	21.0
OSB - commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	97.0	231.0	204.0	413.0
OSB - commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	1.0	5.0	3.0	8.0
OSB - commodity [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
OSB - commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
OSB - commodity [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues		0.0	(3.0)	0.0
OSB - value-add [Member]
Disaggregation of Revenue [Line Items]
Revenues	138.0	208.0	276.0	386.0
OSB - value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	12.0	0.0	22.0
OSB - value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	100.0	155.0	199.0	284.0
OSB - value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	2.0	4.0	4.0	8.0
OSB - value-add [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	35.0	37.0	73.0	72.0
OSB - value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
OSB - value-add [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LVL [Member]
Disaggregation of Revenue [Line Items]
Revenues	40.0	40.0	71.0	77.0
LVL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LVL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LVL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	40.0	40.0	71.0	77.0
LVL [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LVL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LVL [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LSL [Member]
Disaggregation of Revenue [Line Items]
Revenues	14.0	17.0	28.0	31.0
LSL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LSL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LSL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	14.0	17.0	28.0	31.0
LSL [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LSL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
LSL [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	(1.0)	0.0
I Joist [Member]
Disaggregation of Revenue [Line Items]
Revenues	38.0	32.0	64.0	64.0
I Joist [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
I Joist [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
I Joist [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	38.0	32.0	64.0	64.0
I Joist [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
I Joist [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
I Joist [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Plywood [Member]
Disaggregation of Revenue [Line Items]
Revenues	6.0	8.0	12.0	16.0
Plywood [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Plywood [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Plywood [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	6.0	8.0	12.0	16.0
Plywood [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Plywood [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Plywood [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	16.0	15.0	35.0	36.0
Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	2.0	3.0	5.0	7.0
Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	1.0	1.0	5.0	4.0
Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.0	7.0	15.0	16.0
Other [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	1.0	1.0	2.0	2.0
Other [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues	107.0	257.0	225.0	457.0
Commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.0	12.0	8.0	21.0
Commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	97.0	231.0	204.0	413.0
Commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	7.0	13.0	15.0	24.0
Commodity [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Commodity [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	(2.0)	0.0	(3.0)	0.0
Value-add [Member]
Disaggregation of Revenue [Line Items]
Revenues	465.0	538.0	910.0	1,009.0
Value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	231.0	246.0	461.0	460.0
Value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	100.0	155.0	199.0	284.0
Value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	95.0	93.0	167.0	179.0
Value-add [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	39.0	44.0	83.0	86.0
Value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Value-add [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	16.0	15.0	35.0	36.0
Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Revenues	2.0	3.0	5.0	7.0
Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Revenues	1.0	1.0	5.0	4.0
Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.0	7.0	15.0	16.0
Other [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Revenues	1.0	1.0	2.0	2.0
Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.0	3.0	10.0	6.0
Other [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.0	$ (1.0)	$ 0.0