BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 2,181	$ 1,772	$ 6,273	$ 5,059
Net contribution to earnings	298	217	886	517
Interest expense, net of capitalized interest	(95)	(87)	(258)	(260)
Income before income taxes	203	130	628	257
Income taxes	(36)	(13)	(119)	(15)
Net earnings	167	117	509	242
Dividends on preference shares	(10)	0	(12)	0
Net earnings attributable to Weyerhaeuser common shareholders	157	117	497	242
Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,394	1,952	6,912	5,615
Net contribution to earnings	277	234	911	495
Operating segments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	353	267	979	779
Net contribution to earnings	118	80	336	227
Operating segments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,030	816	3,083	2,226
Net contribution to earnings	79	59	393	82
Operating segments | Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	474	459	1,424	1,391
Net contribution to earnings	47	78	135	162
Operating segments | Real Estate:
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	324	230	787	663
Net contribution to earnings	33	17	47	24
Operating intersegments
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	213	180	639	556
Operating intersegments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	194	162	584	498
Operating intersegments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	19	18	55	58
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	(213)	(180)	(639)	(556)
Unallocated Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	$ 21	$ (17)	$ (25)	$ 22