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MERGER WITH PLUM CREEK Unaudited Proforma (Details) - Plum Creek
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Net sales | $ $ 6,525
Net earnings from continuing operations attributable to Weyerhaeuser common shareholders | $ $ 519
Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, basic | $ / shares $ 0.69
Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, diluted | $ / shares $ 0.68