DISCONTINUED OPERATIONS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock in exchange for the distribution of shares of Weyerhaeuser Real Estate Company (WRECO) to our shareholders	59,000,000	0	58,813,151	0
Cash		$ 0	$ 707	$ 0
Share price of common shares tendered			$ 33.22
Real Estate Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of disposition	Jul. 07, 2014
Unsecured and unsubordinated senior debt obligations issued by WRECO					$ 900
Net proceeds from issuance of debt	$ 870
Proceeds utilized by WRECO to repay intercompany debt and interest to Weyerhaeuser Company	744
Cash on hand	5
Adjustment amount payable pursuant to the terms of the transaction agreement	32
Cash	$ 707		$ 707