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LONG-TERM DEBT - Long-Term Debt by Types and Interest Rates (Includes Current Portion) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 0us-gaap_LineOfCredit  
Other 1us-gaap_OtherLongTermDebt 1us-gaap_OtherLongTermDebt
Long-term debt, before unamortized discounts 4,896us-gaap_DebtInstrumentCarryingAmount 4,896us-gaap_DebtInstrumentCarryingAmount
Less unamortized discounts (5)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet (5)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Total 4,891us-gaap_LongTermDebt 4,891us-gaap_LongTermDebt
Portion due within one year 0us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent
6.95% debentures due 2017    
Debt Instrument [Line Items]    
Long-term debt 281us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFourMember		 281us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFourMember
Debt, interest rate 6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFourMember		  
Debt, maturity date Dec. 31, 2017  
7.00% debentures due 2018    
Debt Instrument [Line Items]    
Long-term debt 62us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFiveMember		 62us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFiveMember
Debt, interest rate 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFiveMember		  
Debt, maturity date Dec. 31, 2018  
7.375% notes due 2019    
Debt Instrument [Line Items]    
Long-term debt 500us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSixMember		 500us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSixMember
Debt, interest rate 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSixMember		  
Debt, maturity date Dec. 31, 2019  
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
Debt, maturity date Dec. 31, 2020  
9.00% debentures due 2021    
Debt Instrument [Line Items]    
Long-term debt 150us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSevenMember		 150us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSevenMember
Debt, interest rate 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSevenMember		  
Debt, maturity date Dec. 31, 2021  
7.125% debentures due 2023    
Debt Instrument [Line Items]    
Long-term debt 191us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentEightMember		 191us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentEightMember
Debt, interest rate 7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentEightMember		  
Debt, maturity date Dec. 31, 2023  
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
Debt, interest rate 4.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTwentyThreeMember		  
Debt, maturity date Dec. 31, 2023  
8.50% debentures due 2025    
Debt Instrument [Line Items]    
Long-term debt 300us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentNineMember		 300us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentNineMember
Debt, interest rate 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentNineMember		  
Debt, maturity date Dec. 31, 2025  
7.95% debentures due 2025    
Debt Instrument [Line Items]    
Long-term debt 136us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTenMember		 136us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTenMember
Debt, interest rate 7.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTenMember		  
Debt, maturity date Dec. 31, 2025  
7.70% debentures due 2026    
Debt Instrument [Line Items]    
Long-term debt 150us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentElevenMember		 150us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentElevenMember
Debt, interest rate 7.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentElevenMember		  
Debt, maturity date Dec. 31, 2026  
7.35% debentures due 2026    
Debt Instrument [Line Items]    
Long-term debt 62us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTwelveMember		 62us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTwelveMember
Debt, interest rate 7.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentTwelveMember		  
Debt, maturity date Dec. 31, 2026  
7.85% debentures due 2026    
Debt Instrument [Line Items]    
Long-term debt 100us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentThirteenMember		 100us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentThirteenMember
Debt, interest rate 7.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentThirteenMember		  
Debt, maturity date Dec. 31, 2026  
6.95% debentures due 2027    
Debt Instrument [Line Items]    
Long-term debt 300us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFourteenMember		 300us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFourteenMember
Debt, interest rate 6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFourteenMember		  
Debt, maturity date Dec. 31, 2027  
7.375% debentures due 2032    
Debt Instrument [Line Items]    
Long-term debt 1,250us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFifteenMember		 1,250us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFifteenMember
Debt, interest rate 7.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentFifteenMember		  
Debt, maturity date Dec. 31, 2032  
6.875% debentures due 2033    
Debt Instrument [Line Items]    
Long-term debt 275us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSixteenMember		 275us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSixteenMember
Debt, interest rate 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSixteenMember		  
Debt, maturity date Dec. 31, 2033  
Industrial revenue bonds, rates from 6.7% to 6.8%, due 2022    
Debt Instrument [Line Items]    
Long-term debt $ 88us-gaap_SpecialAssessmentBond
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSeventeenMember		 $ 88us-gaap_SpecialAssessmentBond
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSeventeenMember
Debt, interest rate minimum 6.70%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSeventeenMember		  
Debt, interest rate maximum 6.80%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= wy_DebtInstrumentSeventeenMember		  
Debt, maturity date Dec. 31, 2022