BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Total	$ 2,141	$ 1,793	$ 4,092	$ 3,287
Net contribution to earnings	321	187	588	300
Interest expense, net of capitalized interest	(81)	(86)	(163)	(173)
Income before income taxes	240	101	425	127
Income taxes	(42)	(17)	(83)	(2)
Net earnings	198	84	342	125
Dividends on preference shares	(2)	0	(2)	0
Net earnings attributable to Weyerhaeuser common shareholders	196	84	340	125
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	2,141	1,793	4,092	3,287
Intersegment sales	184	166	426	376
Total sales	2,325	1,959	4,518	3,663
Net contribution to earnings	321	164	634	261
Operating Segments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	333	262	626	512
Intersegment sales	166	146	390	336
Net contribution to earnings	114	77	218	147
Operating Segments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	1,065	776	2,053	1,410
Intersegment sales	18	20	36	40
Net contribution to earnings	136	36	314	23
Operating Segments | Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	476	459	950	932
Net contribution to earnings	57	36	88	84
Operating Segments | Real Estate
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	267	296	463	433
Net contribution to earnings	14	15	14	7
Intersegment Elimination
Segment Reporting, Revenue Reconciling Item [Line Items]
Intersegment sales	(184)	(166)	(426)	(376)
Unallocated Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	$ 0	$ 23	$ (46)	$ 39