MERGER WITH PLUM CREEK Consideration Transferred (Details) - Plum Creek $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	Feb. 19, 2016 USD ($) $ / 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	278,886,704	0	0
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 equity consideration transferred	$ 6,383