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MERGER WITH PLUM CREEK Unaudited Pro Forma Information (Details) - Plum Creek - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Business Acquisition [Line Items]    
Net sales $ 1,655 $ 3,216
Net earnings from continuing operations attributable to Weyerhaeuser common shareholders $ 122 $ 266
Earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, basic $ 0.16 $ 0.35
Earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, diluted $ 0.16 $ 0.35