NET EARNINGS PER SHARE - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2013 6.375 percent Mandatory Convertible Preference Shares, Series A
Basic and diluted earnings per share attributable to Weyerhaeuser common shareholders	$ 0.31	$ 0.26
New shares issued			13.8
New shares issued, date			Jun. 24, 2013