NET EARNINGS PER SHARE - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Stock repurchase program 2014	Oct. 31, 2014 Subsequent event Stock repurchase program 2014	Jun. 30, 2013 6.375 percent Mandatory Convertible Preference Shares, Series A
Basic earnings per share attributable to Weyerhaeuser common shareholders	$ 2.17	$ 0.27	$ 2.85	$ 0.89
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 2.15	$ 0.27	$ 2.83	$ 0.88
New shares issued							13,800,000
New shares issued, date							Jun. 24, 2013
Stock repurchase program, authorized repurchase amount					$ 700
Stock repurchase program, shares repurchased					3,851,430
Stock repurchase program, shares repurchased value					130
Stock repurchase program, repurchase of common stock, cash settlement			123	0		7
Stock repurchase program, remaining authorized repurchase amount					$ 570