NET EARNINGS PER SHARE Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended		6 Months Ended
	Aug. 01, 2016 USD ($) shares	Jul. 31, 2016 shares	Jun. 28, 2016 $ / shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 $ / shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 $ / shares	Jul. 01, 2016 shares	Dec. 31, 2015 USD ($) shares
Basic and diluted earnings per share attributable to Weyerhaeuser common shareholders | $ / shares				$ 0.21	$ 0.26	$ 0.33	$ 0.43
Stock repurchase program, shares repurchased | shares				26,673,396		58,040,937
Stock repurchase program, shares repurchased value | $				$ 832		$ 1,695
Stock repurchase program, authorized repurchase amount | $									$ 2,500
Stock repurchase program, remaining authorized repurchase amount | $				$ 806		$ 806
Volume weighted average price per share | $ / shares			$ 29.54
Unsettled Share Repurchases [Member]
Stock repurchase program, shares repurchased | shares				2,260,407
Stock repurchase program, shares repurchased value | $				$ 66
Subsequent Event
Stock repurchase program, shares repurchased | shares	8,802,375
Stock repurchase program, shares repurchased value | $	$ 274
Stock repurchase program, remaining authorized repurchase amount | $	$ 532
Preference shares conversion ratio								1.6929
Shares issued upon conversion of stock | shares		23,200,000
6.375 percent Mandatory Convertible Preference Shares, Series A
Preference shares, outstanding | shares				13,693,046		13,693,046			13,799,711
6.375 percent Mandatory Convertible Preference Shares, Series A | Subsequent Event
Preference shares, outstanding | shares								13,700,000