BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 1,964	$ 1,874	$ 3,700	$ 3,629
Net contribution to earnings	440	321	773	588
Interest expense, net of capitalized interest	(85)	(81)	(168)	(163)
Income before income taxes (continuing and discontinued operations)	355	240	605	425
Income taxes (continuing and discontinued operations)	(64)	(42)	(120)	(83)
Net earnings	291	198	485	342
Dividends on preference shares	(11)	(2)	(22)	(2)
Net earnings attributable to Weyerhaeuser common shareholders	280	196	463	340
Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,964	1,874	3,700	3,629
Discontinued operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	29	20	45	24
Operating segments | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,171	2,058	4,164	4,055
Net contribution to earnings	363	307	645	620
Operating segments | Timberlands | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	397	333	774	626
Net contribution to earnings	170	114	334	218
Operating segments | Wood Products | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,077	1,065	1,975	2,053
Net contribution to earnings	102	136	166	314
Operating segments | Cellulose Fibers | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	490	476	951	950
Net contribution to earnings	91	57	145	88
Operating intersegments | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	207	184	464	426
Operating intersegments | Timberlands | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	186	166	424	390
Operating intersegments | Wood Products | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	21	18	40	36
Intersegment eliminations | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	(207)	(184)	(464)	(426)
Unallocated Items | Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	$ 48	$ (6)	$ 83	$ (56)