BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Total	$ 1,951	$ 1,494
Net contribution to earnings	267	113
Interest expense, net of capitalized interest	(82)	(87)
Income before income taxes	185	26
Income taxes	(41)	15
Net earnings attributable to Weyerhaeuser common shareholders	144	41
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	1,951	1,494
Intersegment sales	242	210
Total sales	2,193	1,704
Net contribution to earnings	313	97
Operating Segments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	293	250
Intersegment sales	224	190
Net contribution to earnings	104	70
Operating Segments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	988	634
Intersegment sales	18	20
Net contribution to earnings	178	(13)
Operating Segments | Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	474	473
Net contribution to earnings	31	48
Operating Segments | Real Estate
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	196	137
Net contribution to earnings	0	(8)
Intersegment Elimination
Segment Reporting, Revenue Reconciling Item [Line Items]
Intersegment sales	(242)	(210)
Unallocated Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	$ (46)	$ 16