SHARE-BASED COMPENSATION - Schedule of Stock Appreciation Rights Activity (Details) (Stock appreciation rights, USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Stock appreciation rights
Rights
Balance, beginning of year	695
Granted	74
Exercised	(322)
Forfeited or expired	(30)
Balance, end of year	417
Exercisable, end of year	327
Weighted Average Exercise Price
Balance, beginning of year	$ 22.96
Granted	$ 30.16
Exercised	$ 24.21
Forfeited or expired	$ 28.80
Balance, end of year	$ 22.85
Exercisable, end of year	$ 21.70
Average Remaining Contractual Term
Balance, end of year	4 years 5 months 9 days
Exercisable, end of year	3 years 4 months 21 days
Aggregate Intrinsic Value
Balance, end of year	$ 5
Exercisable, end of year	$ 5

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	wy_SharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsaggregateintrinsicvalueabstractAbstract
Namespace Prefix:	wy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Exercisable, Intrinsic Value

+ References

No definition available.

+ Details

Name:	wy_Sharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsexercisableintrinsicvalue
Namespace Prefix:	wy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Exercisable, Number

+ References

No definition available.

+ Details

Name:	wy_Sharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsexercisablenumber
Namespace Prefix:	wy_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of equity instruments other than options outstanding and currently exercisable under the plan.

+ References

No definition available.

+ Details

Name:	wy_Sharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsexercisableweightedaverageexerciseprice
Namespace Prefix:	wy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term for equity-based awards excluding options exercisable at period end, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	wy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerm
Namespace Prefix:	wy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period

+ References

No definition available.

+ Details

Name:	wy_Sharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsexercisesinperiod
Namespace Prefix:	wy_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period, Weighted Average Exercise Price

+ References

No definition available.

+ Details

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

- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Exercise Price

+ References

No definition available.

+ Details

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

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Exercise Price

+ References

No definition available.

+ Details

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

- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Intrinsic Value

+ References

No definition available.

+ Details

Name:	wy_Sharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsoutstandingintrinsicvalue
Namespace Prefix:	wy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	wy_SharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsvestedandnonvestedrollforwardAbstract
Namespace Prefix:	wy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Unvested, Number

+ References

No definition available.

+ Details

Name:	wy_Sharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsvestedandunvestednumber
Namespace Prefix:	wy_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Unvested, Weighted Average Exercise Price

+ References

No definition available.

+ Details

Name:	wy_Sharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsvestedandunvestedweightedaverageexerciseprice
Namespace Prefix:	wy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	wy_SharebasedcompensationarrangementbysharebasedpaymentawardequityinstrumentsotherthanoptionsweightedaverageexercisepriceabstractAbstract
Namespace Prefix:	wy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	wy_SharebasedcompensationarrangementbysharebasedpaymentawardotherthanoptionsweightedaverageremainingcontractualtermabstractAbstract
Namespace Prefix:	wy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration