NET EARNINGS PER SHARE - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Aug. 27, 2015	Dec. 31, 2014	Aug. 13, 2014
Basic earnings per share attributable to Weyerhaeuser common shareholders	$ 0.35	$ 2.17	$ 0.78	$ 2.85
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.35	$ 2.15	$ 0.77	$ 2.83
Common shares, outstanding	511,032,862		511,032,862			524,474,315
Stock repurchase program 2014
Stock repurchase program, shares repurchased	3,258,148		15,442,231
Stock repurchase program, shares repurchased value	$ 90		$ 496
Stock repurchase program, authorized repurchase amount							$ 700
Stock repurchase program, number of shares repurchased under authorization	21,505,224		21,505,224
Stock repurchase program, amount of repurchases made under authorization	$ 700		$ 700
Stock repurchase program 2015
Stock repurchase program, authorized repurchase amount					$ 500
Stock repurchase program, remaining authorized repurchase amount	$ 500		$ 500