DISCONTINUED OPERATIONS - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	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	58,813,151	58,813,151	0	0
Cash		$ 707	$ 0	$ 0
Share price of common shares tendered		$ 33.22
Net gain on divestiture		972	0	0
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
Net gain on divestiture	972	$ 972