BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	$ 1,494	$ 1,422
Intersegment sales	210	211
Total sales and revenues	1,704	1,633
Total	1,494	1,422
Net contribution to earnings	113	249
Interest expense, net of capitalized interest	(87)	(93)
Income before income taxes (continuing and discontinued operations)	26	156
Income taxes (continuing and discontinued operations)	15	(57)
Net earnings attributable to Weyerhaeuser common shareholders	41	99
Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	250	230
Intersegment sales	190	191
Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	634	526
Intersegment sales	20	20
Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	473	506
Real Estate
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	137	160
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Intersegment sales	(210)	(211)
Segment, Continuing Operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	85	290
Segment, Continuing Operations \| Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	71	241
Segment, Continuing Operations \| Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	(22)	(36)
Segment, Continuing Operations \| Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	44	86
Segment, Continuing Operations \| Real Estate
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	(8)	(1)
Unallocated items
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	28	(43)
Segment, Discontinued Operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	$ 0	$ 2

The sum of current income tax expense or benefit and deferred income tax expense or benefit pertaining to continuing operations, tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items, and tax effect of gains and losses from events or transactions meeting the criteria to be classified as an extraordinary item.

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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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-Name Emerging Issues Task Force (EITF)

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- Definition

Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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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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Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

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- Definition

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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Net contribution (charge) to earnings

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