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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]        
Net sales $ 1,709 $ 1,763 $ 4,925 $ 5,081
Net earnings from continuing operations attributable to Weyerhaeuser common shareholders $ 172 $ 198 $ 438 $ 382
Earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, basic $ 0.23 $ 0.25 $ 0.58 $ 0.48
Earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, diluted $ 0.23 $ 0.25 $ 0.58 $ 0.48