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LONG-TERM DEBT - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt   $ 0us-gaap_LineOfCredit
Early repayment of long-term debt 40us-gaap_EarlyRepaymentOfSeniorDebt  
4.625% notes due 2023    
Debt Instrument [Line Items]    
Long-term debt 500us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTwentyThreeMember
500us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTwentyThreeMember
Net proceeds from issuance of debt 495us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTwentyThreeMember
 
Variable rate term loan credit facility due 2020    
Debt Instrument [Line Items]    
Long-term debt 550us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
550us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
Proceeds from long-term debt 550us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
 
Longview Timber assumed debt    
Debt Instrument [Line Items]    
Early repayment of long-term debt 1,118us-gaap_RepaymentsOfAssumedDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember
 
Pretax charges in connection with early extinguishment of debt $ 25us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LongTermDebtMember