MERGER WITH PLUM CREEK Consideration Transferred (Details) - Plum Creek [Member] $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) shares	Feb. 19, 2016 USD ($) $ / shares shares
Business Acquisition [Line Items]
Number of Plum Creek common shares outstanding(1) | shares		174,307,267
Exchange ratio per the merger agreement		1.60
Weyerhaeuser shares issued in exchange for Plum Creek equity(2) | shares	278,901,479
Price per Weyerhaeuser common share(3) | $ / shares		$ 22.87
Aggregate value of Weyerhaeuser common stock issued		$ 6,378
Fair value of stock options(4)		$ 5
Estimated consideration transferred	$ 6,383