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MERGER WITH PLUM CREEK Unaudited ProForma Information (Details) - Plum Creek [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]    
Net sales $ 1,991 $ 2,125
Net earnings attributable to Weyerhaeuser common shareholders $ 164 $ 103
Basic earnings per share attributable to Weyerhaeuser common shareholders $ 0.21 $ 0.13
Diluted earnings per share attributable to Weyerhaeuser common shareholders $ 0.21 $ 0.13