BUSINESS SEGMENTS - Reconciliation from Segment Totals to Consolidated (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	$ 1,772	$ 1,569	$ 5,059	$ 4,601
Intersegment sales	180	174	556	540
Total sales and revenues	1,952	1,743	5,615	5,141
Total	1,772	1,569	5,059	4,601
Net contribution to earnings	217	152	517	518
Interest expense, net of capitalized interest	(87)	(86)	(260)	(296)
Income before income taxes (continuing and discontinued operations)	130	66	257	222
Income taxes (continuing and discontinued operations)	(13)	91	(15)	44
Net earnings attributable to Weyerhaeuser common shareholders	117	157	242	266
Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	267	252	779	770
Intersegment sales	162	154	498	479
Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	816	603	2,226	1,734
Intersegment sales	18	20	58	61
Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	459	503	1,391	1,535
Real Estate
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to and revenues from unaffiliated customers	230	211	663	562
Segment, Continuing Operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	234	130	495	587
Segment, Continuing Operations \| Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	80	61	227	420
Segment, Continuing Operations \| Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	59	(80)	82	(166)
Segment, Continuing Operations \| Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	78	139	162	316
Segment, Continuing Operations \| Real Estate
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	17	10	24	17
Unallocated Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	(17)	(15)	22	(89)
Segment, Discontinued Operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net contribution to earnings	0	37	0	20
Intersegment Elimination [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Intersegment sales	$ (180)	$ (174)	$ (556)	$ (540)

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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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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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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