NET EARNINGS (LOSS) PER SHARE - Additional Information (Detail) (USD $) In Billions, except Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Sep. 30, 2010	Sep. 01, 2010
Earnings Per Share Disclosure [Line Items]
Basic and diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.02	$ 0.07	$ 0.20	$ (0.03)
Special dividend paid					$ 5.6
Special dividend, number of common shares issued					324
Special dividend, payment date						Sep. 01, 2010
Performance share units | Maximum
Earnings Per Share Disclosure [Line Items]
Final number of shares awarded of each grant's target	150.00%		150.00%