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MERGER WITH PLUM CREEK Unaudited Pro Forma Information (Details) - Plum Creek [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]        
Net sales $ 1,655 $ 1,640 $ 3,216 $ 3,318
Net earnings from continuing operations attributable to Weyerhaeuser common shareholders $ 122 $ 114 $ 266 $ 184
Earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, basic $ 0.16 $ 0.14 $ 0.35 $ 0.23
Earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, diluted $ 0.16 $ 0.14 $ 0.35 $ 0.23