CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in unamortized net pension and other postretirement benefit loss, tax expense (benefit)	$ (191)	$ (243)	$ 66
Changes in unamortized prior service credit, tax expense (benefit)	$ 51	$ (49)	$ 9

Other Comprehensive Income Change In Net Actuarial Gain Loss Tax

No definition available.

Name:	wy_ChangesInUnamortizedNetPensionAndOtherPostretirementBenefitLossTaxExpenseBenefit
Namespace Prefix:	wy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration