EQUITY AFFILIATES - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Other than Temporary Impairment	$ 84,000,000
Equity method investment other than temporary impairment, tax benefit	28,000,000
Equity method investment other than temporary impairment, net of tax benefit	$ 56,000,000
North Pacific Paper Corporation (NORPAC)
Schedule of Equity Method Investments [Line Items]
Equity affiliate, ownership	50.00%	50.00%
Amounts paid to Weyerhaeuser by NORPAC for goods and services		$ 197,000,000	$ 195,000,000	$ 203,000,000
Payable balance to equity affiliate	$ 46,000,000	$ 46,000,000	75,000,000
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
Minimum | North Pacific Paper Corporation (NORPAC)
Schedule of Equity Method Investments [Line Items]
Fair Value Inputs, Discount Rate	10.50%
Maximum | North Pacific Paper Corporation (NORPAC)
Schedule of Equity Method Investments [Line Items]
Fair Value Inputs, Discount Rate	14.00%