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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in unamortized net pension and other postretirement benefit gain (loss), tax expense (benefit) $ (323)wy_ChangesInUnamortizedNetPensionAndOtherPostretirementBenefitLossTaxExpenseBenefit $ 480wy_ChangesInUnamortizedNetPensionAndOtherPostretirementBenefitLossTaxExpenseBenefit $ (191)wy_ChangesInUnamortizedNetPensionAndOtherPostretirementBenefitLossTaxExpenseBenefit
Changes in unamortized prior service credit (loss), tax expense (benefit) $ (64)wy_ChangesInUnamortizedPriorServiceCreditTaxExpenseBenefit $ 23wy_ChangesInUnamortizedPriorServiceCreditTaxExpenseBenefit $ (51)wy_ChangesInUnamortizedPriorServiceCreditTaxExpenseBenefit