DISCONTINUED OPERATIONS - Components of the net gain on divestiture (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common shares tendered (58,813,151 shares at $33.22 per share)		$ 1,954	$ 0	$ 0
Cash		707	0	0
Gain on WRECO divestiture		972	0	0
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
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]
Common shares tendered (58,813,151 shares at $33.22 per share)		1,954
Cash	707	707
Proceeds		2,661
Net book value of contributed assets		1,671
Transaction costs, net of reimbursement		18
Net book value of contributed assets and transaction costs, net of reimbursement		1,689
Gain on WRECO divestiture	972	$ 972