LONGVIEW TIMBER PURCHASE - Summarized unaudited pro forma information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Business Acquisition [Line Items]
Net sales	$ 2,196	$ 1,840	$ 4,199	$ 3,379
Net earnings attributable to Weyerhaeuser common shareholders	$ 211	$ 74	$ 361	$ 110
Basic earnings per share attributable to Weyerhaeuser common shareholders	$ 0.36	$ 0.13	$ 0.62	$ 0.19
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.36	$ 0.13	$ 0.62	$ 0.19