NET EARNINGS PER SHARE - Additional Information (Details) - $ / shares shares in Thousands		3 Months Ended								12 Months Ended
	Jun. 24, 2013	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic earnings per share attributable to Weyerhaeuser common shareholders		$ 0.11	$ 0.35	$ 0.26	$ 0.17	$ 0.32	$ 2.17	$ 0.48	$ 0.31	$ 0.89	$ 3.20	$ 0.95
Diluted earnings per share attributable to Weyerhaeuser common shareholders		$ 0.11	$ 0.35	$ 0.26	$ 0.17	$ 0.31	$ 2.15	$ 0.47	$ 0.31	$ 0.89	$ 3.18	$ 0.95
New shares issued										0	0	33,350
6.375 percent Mandatory Convertible Preference Shares, Series A
New shares issued	13,800