LONGVIEW TIMBER PURCHASE - Summarized unaudited pro forma information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Business Acquisition [Line Items]
Net sales	$ 2,003
Net earnings attributable to Weyerhaeuser common shareholders	$ 150
Earnings per share attributable to Weyerhaeuser common shareholders, basic and diluted	$ 0.26

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma basic and diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

+ Details

Name:	wy_BusinessAcquisitionProFormaEarningsPerShareBasicandDiluted
Namespace Prefix:	wy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration