OTHER OPERATING INCOME, NET - Various Income and Expense Items Included in Other Operating Income, Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gain on postretirement plan amendment (Note 9)	$ (151)	$ 0	$ (103)
Gain on disposition of non-strategic assets	(27)us-gaap_GainLossOnDispositionOfAssets	(19)us-gaap_GainLossOnDispositionOfAssets	(28)us-gaap_GainLossOnDispositionOfAssets
Foreign exchange (gains) losses, net	27	7	(6)
Land management income	(34)wy_LandManagementIncome	(28)wy_LandManagementIncome	(27)wy_LandManagementIncome
Litigation expense, net	9	16	12
Other, net	(25)us-gaap_OtherOperatingIncome	(11)us-gaap_OtherOperatingIncome	(26)us-gaap_OtherOperatingIncome
Total	$ (201)us-gaap_OtherOperatingIncomeExpenseNet	$ (35)us-gaap_OtherOperatingIncomeExpenseNet	$ (178)us-gaap_OtherOperatingIncomeExpenseNet

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(1)

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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-Publisher FASB

-Name Accounting Standards Codification

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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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-Subparagraph (SX 210.5-03.1)

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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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Revenue recognized during the period for the management of land holdings.

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