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EQUITY AFFILIATES - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
North Pacific Paper Corporation (NORPAC)
Schedule of Equity Method Investments [Line Items]
Equity affiliate, ownership	50.00%
Amounts paid to Weyerhaeuser by NORPAC for goods and services	$ 195,000,000	$ 203,000,000	$ 221,000,000
Payable balance to equity affiliate	75,000,000	93,000,000
Catchlight Energy
Schedule of Equity Method Investments [Line Items]
Equity affiliate, proceeds from dissolution	0
Liaison Technologies Inc
Schedule of Equity Method Investments [Line Items]
Pretax gain on partial sale of equity affiliate investment		$ 10,000,000