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EQUITY AFFILIATES - Operating Results of Equity Affiliates (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]      
Net sales $ 501us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 534us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 553us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Operating income (loss) (2)wy_EquityAffiliatesOperatingIncomeLoss 3wy_EquityAffiliatesOperatingIncomeLoss 3wy_EquityAffiliatesOperatingIncomeLoss
Net income (loss) $ 0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ (7)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss