BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 1,721us-gaap_SalesRevenueNet	$ 1,736us-gaap_SalesRevenueNet
Net contribution to earnings	203wy_NetContributionToEarnings	333wy_NetContributionToEarnings
Interest expense, net of capitalized interest (continuing and discontinued operations)	(83)	(83)
Income before income taxes (continuing and discontinued operations)	120	250
Income taxes (continuing and discontinued operations)	(19)	(56)
Net earnings	101us-gaap_NetIncomeLoss	194us-gaap_NetIncomeLoss
Dividends on preference shares	(11)	(11)
Net earnings attributable to Weyerhaeuser common shareholders	90	183
Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,721	1,736
Discontinued operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	0	16
Operating segments \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,968	1,993
Net contribution to earnings	257	282
Operating segments \| Timberlands \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	351	377
Net contribution to earnings	162	164
Operating segments \| Wood Products \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	923	898
Net contribution to earnings	62	64
Operating segments \| Cellulose Fibers \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	447	461
Net contribution to earnings	33	54
Operating intersegments \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	247	257
Operating intersegments \| Timberlands \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	228	238
Operating intersegments \| Wood Products \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	19	19
Intersegment eliminations \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	(247)	(257)
Unallocated Items \| Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	$ (54)	$ 35

Amount of current tax expense (benefit) and deferred tax expense (benefit) from income (loss) from continuing operations, income (loss) from discontinued operations, and gain (loss) from extraordinary items.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 45

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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This element represents the income or loss from both continuing operations and discontinued operations to the economic entity, after income or loss from equity method investments, but before income taxes, extraordinary items.

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Amount of the cost of borrowed funds accounted for as interest expense, including continuing and discontinued operations.

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This element represents the income or (loss) from continuing operations (before interest expense) attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before, interest expense, income taxes, extraordinary items, and noncontrolling interest.

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