BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 1,984	$ 1,951
Net contribution to earnings	333	267
Interest expense, net of capitalized interest	(83)	(82)
Income before income taxes	250	185
Income taxes	(56)	(41)
Net earnings	194	144
Dividends on preference shares	(11)	0
Net earnings attributable to Weyerhaeuser common shareholders	183	144
Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,241	2,193
Net contribution to earnings	294	313
Operating segments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	377	293
Net contribution to earnings	164	104
Operating segments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	898	988
Net contribution to earnings	64	178
Operating segments | Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	461	474
Net contribution to earnings	54	31
Operating segments | Real Estate
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	248	196
Net contribution to earnings	12	0
Operating intersegments
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	257	242
Operating intersegments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	238	224
Operating intersegments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	19	18
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	(257)	(242)
Unallocated Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	$ 39	$ (46)