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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 3.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate  
United States Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 4.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember		 4.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
United States Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 3.60%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember		 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Canadian Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 3.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember		 4.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Canadian Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rates 3.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember		 4.60%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Election of lump sum or installment distributions (US salaried and nonqualified plans only) 60.00%wy_Electionoflumpsumorinstallmentdistributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 60.00%wy_Electionoflumpsumorinstallmentdistributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Salaried | United States Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Rate of compensation increase, current year 2.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseCurrentYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember		 2.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseCurrentYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Rate of compensation increase, thereafter 3.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseFollowingYears
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember		 3.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseFollowingYears
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Salaried | Canadian Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Rate of compensation increase, current year 2.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseCurrentYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember		 2.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseCurrentYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Rate of compensation increase, thereafter 3.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseFollowingYears
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember		 3.50%wy_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateofCompensationIncreaseFollowingYears
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_SalariedMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Hourly | United States Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Rate of compensation increase 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_HourlyMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember		 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_HourlyMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Hourly | United States Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Rate of compensation increase 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_HourlyMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember		 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_HourlyMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Hourly | Canadian Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Rate of compensation increase 3.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_HourlyMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember		 3.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= wy_HourlyMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember