Weyerhaeuser (WY) 10-K 13 Feb 15 2014 FY Annual report Financial data

DOCUMENT_AND_ENTITY_INFORMATIO

DOCUMENT AND ENTITY INFORMATION (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Jan. 30, 2015	Jun. 30, 2014
Document Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	WY
Entity Registrant Name	WEYERHAEUSER CO
Entity Central Index Key	106535
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		524,997,504
Entity Public Float			$19.10

CONSOLIDATED_STATEMENT_OF_OPER

CONSOLIDATED STATEMENT OF OPERATIONS (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$7,403	$7,254	$5,989
Costs of products sold	5,763	5,716	4,993
Gross margin	1,640	1,538	996
Selling expenses	112	125	116
General and administrative expenses	338	404	382
Research and development expenses	27	33	32
Charges for restructuring, closures and impairments (Note 18)	44	377	26
Other operating income, net (Note 19)	-201	-35	-178
Operating income	1,320	634	618
Interest income and other	37	55	48
Interest expense, net of capitalized interest	-344	-369	-344
Earnings from continuing operations before income taxes	1,013	320	322
Income taxes (Note 20)	-185	171	-10
Earnings from continuing operations	828	491	312
Earnings from discontinued operations, net of income taxes (Note 3)	998	72	72
Net earnings	1,826	563	384
Net loss attributable to noncontrolling interests	0	0	1
Net earnings attributable to Weyerhaeuser	1,826	563	385
Dividends on preference shares	-44	-23	0
Net earnings attributable to Weyerhaeuser common shareholders	$1,782	$540	$385
Basic earnings per share attributable to Weyerhaeuser common shareholders (Note 5):
Continuing operations	$1.41	$0.82	$0.58
Discontinued operations	$1.79	$0.13	$0.13
Net earnings per share	$3.20	$0.95	$0.71
Diluted earnings per share attributable to Weyerhaeuser common shareholders (Note 5):
Continuing operations	$1.40	$0.82	$0.58
Discontinued operations	$1.78	$0.13	$0.13
Net earnings per share	$3.18	$0.95	$0.71
Dividends paid per common share	$1.02	$0.81	$0.62
Weighted average shares outstanding (in thousands) (Note 5):
Basic	556,705	566,329	539,140
Diluted	560,899	571,239	542,310

CONSOLIDATED_STATEMENT_OF_COMP

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Comprehensive income:
Consolidated net earnings	$1,826	$563	$384
Other comprehensive income (loss):
Foreign currency translation adjustments	-50	-59	2
Changes in unamortized net pension and other postretirement benefit gain (loss), net of tax expense (benefit) of ($323) in 2014, $480 in 2013 and ($191) in 2012	-554	902	-258
Changes in unamortized prior service credit (cost), net of tax expense (benefit) of ($64) in 2014, $23 in 2013 and ($51) in 2012	-103	27	-123
Unrealized gains on available-for-sale securities	0	2	0
Total comprehensive income	1,119	1,435	5
Comprehensive loss attributable to noncontrolling interests	0	0	1
Total comprehensive income attributable to Weyerhaeuser shareholders	$1,119	$1,435	$6

CONSOLIDATED_STATEMENT_OF_COMP1

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in unamortized net pension and other postretirement benefit gain (loss), tax expense (benefit)	($323)	$480	($191)
Changes in unamortized prior service credit (loss), tax expense (benefit)	($64)	$23	($51)

CONSOLIDATED_BALANCE_SHEET

CONSOLIDATED BALANCE SHEET (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets
Cash and cash equivalents	$1,580	$830
Receivables, less discounts and allowances of $3 and $4	525	518
Receivables for taxes	25	101
Inventories (Note 6)	595	542
Prepaid expenses	80	117
Deferred tax assets (Note 20)	228	130
Current assets of discontinued operations (Note 3)	0	88
Total current assets	3,033	2,326
Property and equipment, less accumulated depreciation of $6,324 and $6,327 (Note 7)	2,623	2,689
Construction in progress	131	112
Timber and timberlands at cost, less depletion charged to disposals	6,530	6,580
Investments in and advances to equity affiliates (Note 8)	188	190
Goodwill	40	42
Deferred tax assets (Note 20)	8	5
Other assets	289	324
Restricted financial investments held by variable interest entities (Note 10)	615	615
Noncurrent assets of discontinued operations (Note 3)	0	1,694
Total assets	13,457	14,577
Liabilities
Notes payable	0	2
Accounts payable	331	343
Accrued liabilities (Note 11)	587	629
Current liabilities of discontinued operations (Note 3)	0	154
Total current liabilities	918	1,128
Long-term debt (Notes 13 and 14)	4,891	4,891
Long-term debt (nonrecourse to the company) held by variable interest entities (Note 10)	511	511
Deferred income taxes (Note 20)	206	285
Deferred pension and other postretirement benefits (Note 9)	1,319	516
Other liabilities	308	382
Noncurrent liabilities of discontinued operations (Note 3)	0	32
Total liabilities	8,153	7,745
Weyerhaeuser shareholders’ interest (Notes 16 and 17):
Mandatory convertible preference shares, series A: $1.00 par value; $50.00 liquidation; authorized 40,000,000 shares; issued and outstanding: 13,800,000 shares	14	14
Common shares: $1.25 par value; authorized 1,360,000,000 shares; issued and outstanding: 524,474,315 and 583,548,428 shares (Notes 3)	656	729
Other capital (Notes 3)	4,519	6,444
Retained earnings	1,508	294
Cumulative other comprehensive loss	-1,393	-686
Total Weyerhaeuser shareholders’ interest	5,304	6,795
Noncontrolling interests	0	3
Noncontrolling interests in discontinued operations (Note 3)	0	34
Total equity	5,304	6,832
Total liabilities and equity	$13,457	$14,577

CONSOLIDATED_BALANCE_SHEET_Par

CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Receivables, discounts and allowances	$3	$4
Property and equipment, accumulated depreciation	$6,324	$6,327
Common shares, par value	$1.25	$1.25
Common shares, authorized	1,360,000,000	1,360,000,000
Common shares, issued	524,474,315	583,548,428
Common shares, outstanding	524,474,315	583,548,428
6.375 percent Mandatory Convertible Preference Shares, Series A
Preference shares, par value	$1	$1
Preference shares, liquidation	$50	$50
Preference shares, authorized	40,000,000	40,000,000
Preference shares, issued	13,800,000	13,800,000
Preference shares, outstanding	13,800,000	13,800,000

CONSOLIDATED_STATEMENT_OF_CASH

CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash flows from operations:
Net earnings	$1,826		$563		$384
Noncash charges (credits) to income:
Depreciation, depletion and amortization	500		472		456
Deferred income taxes, net (Note 20)	205		-29		109
Pension and other postretirement benefits (Note 9)	-152		101		-19
Share-based compensation expense (Note 17)	40		42		37
Charges for impairment of assets (Note 18)	2		372		24
Net gains on dispositions of assets and operations(1) (Note 3)	-1,050	[1]	-58	[1]	-69	[1]
Foreign exchange transaction (gains) losses (Note 19)	27		7		-6
Change in, net of acquisition:
Receivables less allowances	29		-27		-33
Receivable for taxes	76		-6		-73
Inventories	-66		-13		-54
Real estate and land	-133		-166		-75
Prepaid expenses	17		-26		-16
Accounts payable and accrued liabilities	-98		-51		18
Deposits on land positions and other assets	15		-18		4
Pension and postretirement contributions / benefit payments	-101		-137		-145
Other	-49		-22		39
Net cash from operations	1,088		1,004		581
Cash flows from investing activities:
Property and equipment	-354		-261		-256
Timberlands reforestation	-41		-32		-29
Acquisition of Longview Timber LLC, net of cash acquired (Note 4)	0		-1,581		0
Net proceeds from Real Estate Divestiture, net of cash divested (Note 3)	707		0		0
Proceeds from sale of assets and operations	28		20		80
Net proceeds of investments held by special purpose entities (Note 10)	0		22		13
Other	21		3		0
Cash from investing activities	361		-1,829		-192
Cash flows from financing activities:
Net proceeds from issuance of common shares (Note 4)	0		897		0
Net proceeds from issuance of preference shares (Note 4)	0		669		0
Net proceeds from issuance of debt (Note 13)	0		1,044		0
Net proceeds from issuance of Weyerhaeuser Real Estate Company (WRECO) debt (Note 3)	887		0		0
Deposit of WRECO debt proceeds into escrow (Note 3)	-887		0		0
Cash dividends on common shares	-563		-458		-334
Cash dividends on preference shares	-44		-23		0
Change in book overdrafts	-17		7		-32
Payments on debt (Note 13)	0		-1,567		-187
Exercises of stock options	119		162		112
Repurchase of common stock (Note 16)	-203		0		0
Other	4		31		-3
Cash from financing activities	-704		762		-444
Net change in cash and cash equivalents	745		-63		-55
Cash and cash equivalents at beginning of year	835		898		953
Cash and cash equivalents at end of year	1,580		835		898
Cash paid (received) during the year for:
Interest, net of amounts capitalized of $13 in 2014, $21 in 2013 and $18 in 2012	319		366		351
Income taxes	-37		8		-13
Acquisition of Longview Timber LLC, debt assumed (Note 4)	0		1,070		0
Common shares tendered in WRECO divestiture (Note 3)	$1,954		$0		$0
[1]	(1) Includes gain on timberland exchanges.

CONSOLIDATED_STATEMENT_OF_CASH1

CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest, amount capitalized	$13	$21	$18

CONSOLIDATED_STATEMENT_OF_CHAN

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $)	Total	6.375 percent Mandatory Convertible Preference Shares, Series A	Common shares	Other capital	Retained earnings	Cumulative other comprehensive loss	Total Weyerhaeuser shareholders' interest	Noncontrolling interests
In Millions
Balance at beginning of year at Dec. 31, 2011		$0	$671	$4,595	$176	($1,179)		$4
New issuance		0	0	0
Shares tendered (Note 3)			0	0
Exercise of stock options			7	105
Conversion to common shares		0
Share repurchases			0	0
Share-based compensation				34
Other transactions, net				-3
Net earnings attributable to Weyerhaeuser	385				385
Dividends on common shares (Note 16)					-342
Cash dividends on preference shares (Note 16)					0
Foreign currency translation adjustments	2					2
Changes in unamortized net pension and other postretirement benefit loss (Note 9)	-258					-258
Changes in unamortized prior service credit (cost) (Note 9)	-123					-123
Unrealized gains on available-for-sale securities	0					0
Net loss attributable to noncontrolling interests	-1							-1
New consolidations, de-consolidations and other transactions								40
Balance at end of year at Dec. 31, 2012	4,113	0	678	4,731	219	-1,558	4,070	43
New issuance		14	42	1,509
Shares tendered (Note 3)			0	0
Exercise of stock options			9	152
Conversion to common shares		0
Share repurchases			0	0
Share-based compensation				42
Other transactions, net				10
Net earnings attributable to Weyerhaeuser	563				563
Dividends on common shares (Note 16)					-465
Cash dividends on preference shares (Note 16)					-23
Foreign currency translation adjustments	-59					-59
Changes in unamortized net pension and other postretirement benefit loss (Note 9)	902					902
Changes in unamortized prior service credit (cost) (Note 9)	27					27
Unrealized gains on available-for-sale securities	2					2
Net loss attributable to noncontrolling interests	0							0
New consolidations, de-consolidations and other transactions								-6
Balance at end of year at Dec. 31, 2013	6,832	14	729	6,444	294	-686	6,795	37
New issuance		0	0	0
Shares tendered (Note 3)			-73	-1,881
Exercise of stock options			7	112
Conversion to common shares		0
Share repurchases			-7	-196
Share-based compensation				35
Other transactions, net				5
Net earnings attributable to Weyerhaeuser	1,826				1,826
Dividends on common shares (Note 16)					-568
Cash dividends on preference shares (Note 16)					-44
Foreign currency translation adjustments	-50					-50
Changes in unamortized net pension and other postretirement benefit loss (Note 9)	-554					-554
Changes in unamortized prior service credit (cost) (Note 9)	-103					-103
Unrealized gains on available-for-sale securities	0					0
Net loss attributable to noncontrolling interests	0							0
New consolidations, de-consolidations and other transactions								-37
Balance at end of year at Dec. 31, 2014	$5,304	$14	$656	$4,519	$1,508	($1,393)	$5,304	$0

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Our significant accounting policies describe:
	•	our election to be taxed as a real estate investment trust,
	•	how we report our results,
	•	changes in how we report our results and
	•	how we account for various items.
	OUR ELECTION TO BE TAXED AS A REAL ESTATE INVESTMENT TRUST (REIT)
	Starting with our 2010 fiscal year, we elected to be taxed as a REIT. We expect to derive most of our REIT income from investments in timberlands, including the sale of standing timber through pay-as-cut sales contracts. REIT income can be distributed to shareholders without first paying corporate level tax, substantially eliminating the double taxation on income. A significant portion of our timberland segment earnings receives this favorable tax treatment. We are, however, subject to corporate taxes on built-in-gains (the excess of fair market value over tax basis at January 1, 2010) on sales of real property (other than standing timber) held by the REIT during the first 10 years following the REIT conversion. We continue to be required to pay federal corporate income taxes on earnings of our Taxable REIT Subsidiary (TRS), which includes our manufacturing businesses and the portion of our Timberlands segment income included in the TRS.
	HOW WE REPORT OUR RESULTS
	Our report includes:
	•	consolidated financial statements,
	•	our business segments,
	•	foreign currency translation,
	•	estimates, and
	•	fair value measurements.
	CONSOLIDATED FINANCIAL STATEMENTS
	Our consolidated financial statements provide an overall view of our results and financial condition. They include our accounts and the accounts of entities that we control, including:
	•	majority-owned domestic and foreign subsidiaries and
	•	variable interest entities in which we are the primary beneficiary.
	They do not include our intercompany transactions and accounts, which are eliminated, and noncontrolling interests are presented as a separate component of equity.
	We account for investments in and advances to unconsolidated equity affiliates using the equity method, with taxes provided on undistributed earnings. This means that we record earnings and accrue taxes in the period that the earnings are recorded by our unconsolidated equity affiliates.
	Throughout these Notes to Consolidated Financial Statements, unless specified otherwise, references to “Weyerhaeuser,” “we” and “our” refer to the consolidated company.
	OUR BUSINESS SEGMENTS
	We are principally engaged in:
	•	growing and harvesting timber; and
	•	manufacturing, distributing and selling products made from trees.
	Our business segments are organized based primarily on products and services.
	Our Business Segments and Products
	SEGMENT	PRODUCTS AND SERVICES
	Timberlands	Logs, timber, minerals, oil and gas and international wood products
	Wood Products	Softwood lumber, engineered wood products, structural panels and building materials distribution
	Cellulose Fibers	Pulp, liquid packaging board and an equity interest in a newsprint joint venture
	We also transfer raw materials, semifinished materials and end products among our business segments. Because of this intracompany activity, accounting for our business segments involves:
	•	pricing products transferred between our business segments at current market values and
	•	allocating joint conversion and common facility costs according to usage by our business segment product lines.
	Gains or charges not related to or allocated to an individual operating segment are held in Unallocated Items. This includes a portion of items such as: share-based compensation; pension and postretirement costs; foreign exchange transaction gains and losses associated with financing; and the elimination of intersegment profit in inventory and the LIFO reserve.
	FOREIGN CURRENCY TRANSLATION
	Local currencies are the functional currencies for most of our operations outside the U.S. We translate foreign currencies into U.S. dollars in two ways:
	•	assets and liabilities — at the exchange rates in effect as of our balance sheet date; and
	•	revenues and expenses — at average monthly exchange rates throughout the year.
	ESTIMATES
	We prepare our financial statements according to U.S. generally accepted accounting principles (U.S. GAAP). This requires us to make estimates and assumptions during our reporting periods and at the date of our financial statements. The estimates and assumptions affect our:
	•	reported amounts of assets, liabilities and equity;
	•	disclosure of contingent assets and liabilities; and
	•	reported amounts of revenues and expenses.
	While we do our best in preparing these estimates, actual results can and do differ from those estimates and assumptions.
	FAIR VALUE MEASUREMENTS
	We use a fair value hierarchy in accounting for certain nonfinancial assets and liabilities including:
	•	long-lived assets (asset groups) measured at fair value for an impairment assessment,
	•	reporting units measured at fair value in the first step of a goodwill impairment test,
	•	nonfinancial assets and nonfinancial liabilities measured at fair value in the second step of a goodwill impairment assessment,
	•	assets acquired and liabilities assumed in a business acquisition and
	•	asset retirement obligations initially measured at fair value.
	The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions.
	The fair value hierarchy consists of the following three levels:
	•	Level 1 — Inputs are quoted prices in active markets for identical assets or liabilities.
	•	Level 2 — Inputs are:
	– quoted prices for similar assets or liabilities in an active market;
	– quoted prices for identical or similar assets or liabilities in markets that are not active; or
	– inputs other than quoted prices that are observable and market-corroborated inputs, which are derived principally from or corroborated by observable market data.
	•	Level 3 — Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
	CHANGES IN HOW WE REPORT OUR RESULTS
	Changes in how we report our results come from:
	•	accounting changes made upon our adoption of new accounting guidance and
•	our reclassification of certain balances and results from prior years to make them consistent with our current reporting.
RECLASSIFICATIONS
We have reclassified certain balances and results from the prior years to be consistent with our 2014 reporting. This makes year-to-year comparisons easier. Our reclassifications had no effect on net earnings or Weyerhaeuser shareholders’ interest. Our reclassifications present the results of operations discontinued in 2014 separately on our Consolidated Statement of Operations, Consolidated Balance Sheet and in the related footnotes. Note 3: Discontinued Operations provides more information about our discontinued operations.
NEW ACCOUNTING PRONOUNCEMENTS
In March 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2013-05, which provides guidance on a parent’s accounting for the cumulative translation adjustment upon derecognition of a subsidiary or group of assets within a foreign entity. This new guidance requires that the parent release any related cumulative translation adjustment into net income only if the sale or transfer results in the complete or substantially complete liquidation of the foreign entity in which the subsidiary or group of assets had resided. Our prospective adoption of this guidance in first quarter 2014 did not have a material effect on our results of operations, financial position or cash flows.
In July 2013, FASB issued ASU 2013-11, which provides guidance on the presentation of unrecognized tax benefits, reflecting the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses or tax credit carryforwards exist. Our prospective adoption of this guidance in first quarter 2014 did not have a material effect on our results of operations, financial position or cash flows.
In April 2014, FASB issued ASU 2014-08, an amendment to the current model of the classification and presentation of discontinued operations and asset disposals that changes the definition of a discontinued operation to include only disposals of components of an entity that represent a strategic shift that has (or will have) a material effect on an entity's financial results. The new standard is effective for all disposals or classifications as assets held for sale for fiscal periods starting after December 15, 2014 and early adoption is permitted. We expect to adopt ASU 2014-08 on January 1, 2015 and have determined that its adoption will not have a material impact on our consolidated financial statements and related disclosures at that time.
In May 2014, FASB issued ASU 2014-09, a comprehensive new revenue recognition model that requires an entity to recognize revenue to depict the transfer of goods or services to customers at an amount that reflects the consideration it expects to receive in exchange for those goods or services. The new standard is effective for us on January 1, 2017 and early adoption is not permitted. We may use either the retrospective or cumulative effect transition method. We are evaluating the impact that ASU 2014-09 will have on our consolidated financial statements and related disclosures. We have not yet selected a transition method nor determined the effect of the standard on our ongoing financial reporting.
HOW WE ACCOUNT FOR VARIOUS ITEMS
This section provides information about how we account for certain key items related to:
•	capital investments,
•	financing our business and
•	operations.
ITEMS RELATED TO CAPITAL INVESTMENTS
Key items related to accounting for capital investments pertain to property and equipment, timber and timberlands, impairment of long-lived assets and goodwill.
Property and Equipment
We maintain property accounts on an individual asset basis. Here is how we handle major items:
•	Improvements to and replacements of major units of property are capitalized.
•	Maintenance, repairs and minor replacements are expensed.
•	Depreciation is calculated using a straight-line method at rates based on estimated service lives.
•	Logging roads are generally amortized — as timber is harvested — at rates based on the volume of timber estimated to be removed.
•	Cost and accumulated depreciation of property sold or retired are removed from the accounts and the gain or loss is included in earnings.
Timber and Timberlands
We carry timber and timberlands at cost less depletion charged to disposals. Depletion refers to the carrying value of timber that is harvested, lost as a result of casualty, or sold.
Key activities affecting how we account for timber and timberlands include:
•	reforestation,
•	depletion and
•	forest management in Canada.
Reforestation. Generally, we capitalize initial site preparation and planting costs as reforestation. We transfer reforestation to a merchantable timber classification when the timber is considered harvestable. That generally occurs after:
•	15 years in the South and
•	30 years in the West.
Generally, we expense costs after the first planting as they are incurred or over the period of expected benefit. These costs include:
•	fertilization,
•	vegetation and insect control,
•	pruning and precommercial thinning,
•	property taxes and
•	interest.
Accounting practices for these costs do not change when timber becomes merchantable and harvesting starts.
Depletion. To determine depletion rates, we divide the net carrying value of timber by the related volume of timber estimated to be available over the growth cycle. To determine the growth cycle volume of timber, we consider:
•	regulatory and environmental constraints,
•	our management strategies,
•	inventory data improvements,
•	growth rate revisions and recalibrations and
•	known dispositions and inoperable acres.
We include the cost of timber harvested in the carrying values of raw materials and product inventories. As these inventories are sold to third parties, we include them in the cost of products sold.
Forest management in Canada. We managed timberlands under long-term licenses in various Canadian provinces that are:
•	granted by the provincial governments;
•	granted for initial periods of 15 to 25 years; and
•	renewable provided we meet reforestation, operating and management guidelines.
Calculation of the fees we pay on the timber we harvest:
•	varies from province to province,
•	is tied to product market pricing and
•	depends upon the allocation of land management responsibilities in the license.
Impairment of Long-Lived Assets
We review long-lived assets — including certain identifiable intangibles — for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Impaired assets held for use are written down to fair value. Impaired assets held for sale are written down to fair value less cost to sell. We determine fair value based on:
•	appraisals,
•	market pricing of comparable assets,
•	discounted value of estimated cash flows from the asset and
•	replacement values of comparable assets.
Goodwill
Goodwill is the purchase price minus the fair value of net assets acquired when we buy another entity. We assess goodwill for impairment:
•	using a fair-value-based approach and
•	at least annually — at the beginning of the fourth quarter.
In 2014 the fair value of the reporting unit with goodwill substantially exceeded its carrying value.
ITEMS RELATED TO FINANCING OUR BUSINESS
Key items related to financing our business include financial instruments, cash and cash equivalents, accounts payable and concentration of risk.
Financial Instruments
We estimate the fair value of financial instruments where appropriate. The assumptions we use — including the discount rate and estimates of cash flows — can significantly affect our fair-value amounts. Our fair values are estimates and may not match the amounts we would realize upon sale or settlement of our financial positions.
Cash and Cash Equivalents
Cash equivalents are investments with original maturities of 90 days or less. We state cash equivalents at cost, which approximates market.
Accounts Payable
Our banking system replenishes our major bank accounts daily as checks we have issued are presented for payment. As a result, we have negative book cash balances due to outstanding checks that have not yet been paid by the bank. These negative balances are included in accounts payable on our Consolidated Balance Sheet. Changes in these negative cash balances are reported as financing activities in our Consolidated Statement of Cash Flows. We had no negative book cash balances as of December 31, 2014 and December 31, 2013.
Concentration of Risk
We disclose customers that represent a concentration of credit risk. As of December 31, 2014, one customer accounted for approximately 13 percent of our accounts receivable balance.
ITEMS RELATED TO OPERATIONS
Key items related to operations include revenue recognition, inventories, shipping and handling costs, income taxes, share-based compensation, pension and other postretirement plans, and environmental remediation.
Revenue Recognition
Operations generally recognize revenue upon shipment to customers. For certain export sales, revenue is recognized when title transfers at the foreign port.
For timberland sales, we recognize revenue when title and possession have been transferred to the buyer and all other criteria for sale and profit recognition have been satisfied.
Inventories
We state inventories at the lower of cost or market. Cost includes labor, materials and production overhead. LIFO — the last-in, first-out method — applies to major inventory products held at our U.S. domestic locations. We began to use the LIFO method for domestic products in the 1940s as required to conform with the tax method elected. Subsequent acquisitions of entities added new products under the FIFO — the first-in, first-out method — or moving average cost methods that have continued under those methods. The FIFO or moving average cost methods applies to the balance of our domestic raw material and product inventories as well as for all material and supply inventories and all foreign inventories.
Shipping and Handling Costs
We classify shipping and handling costs in the costs of products sold in our Consolidated Statement of Operations.
Income Taxes
We account for income taxes under the asset and liability method. Unrecognized tax benefits represent potential future funding obligations to taxing authorities if uncertain tax positions the company has taken on previously filed tax returns are not sustained. In accordance with the company’s accounting policy, accrued interest and penalties related to unrecognized tax benefits are recognized as a component of income tax expense.
We recognize deferred tax assets and liabilities to reflect:
•	future tax consequences due to differences between the carrying amounts for financial purposes and the tax bases of certain items and
•	operating loss and tax credit carryforwards.
To measure deferred tax assets and liabilities, we:
•	determine when the differences between the carrying amounts and tax bases of affected items are expected to be recovered or resolved and
•	use enacted tax rates expected to apply to taxable income in those years.
Share-Based Compensation
We generally measure the fair value of share-based awards on the dates they are granted or modified. These measurements establish the cost of the share-based awards for accounting purposes. We then recognize the cost of share-based awards in our Consolidated Statement of Operations over each employee’s required service period. Note 17: Share-Based Compensation provides more information about our share-based compensation.
Pension and Other Postretirement Benefit Plans
We recognize the overfunded or underfunded status of our defined benefit pension and other postretirement plans on our Consolidated Balance Sheet and recognize changes in the funded status through comprehensive income (loss) in the year in which the changes occur.
Actuarial valuations determine the amount of the pension and other postretirement benefit obligations and the net periodic benefit cost we recognize. The net periodic benefit cost includes:
•	cost of benefits provided in exchange for employees’ services rendered during the year;
•	interest cost of the obligations;
•	expected long-term return on fund assets;
•	gains or losses on plan settlements and curtailments;
•	amortization of prior service costs and plan amendments over the average remaining service period of the active employee group covered by the plans or the average remaining life expectancy in situations where the plan participants affected by the plan amendment are inactive; and
•	amortization of cumulative unrecognized net actuarial gains and losses — generally in excess of 10 percent of the greater of the benefit obligation or market-related value of plan assets at the beginning of the year — over the average remaining service period of the active employee group covered by the plans or the average remaining life expectancy in situations where the plan participants are inactive.
Pension plans. We have pension plans covering most of our employees. Determination of benefits differs for salaried, hourly and union employees:
•	Salaried employee benefits are based on each employee’s highest monthly earnings for five consecutive years during the final 10 years before retirement.
•	Hourly and union employee benefits generally are stated amounts for each year of service.
•	Union employee benefits are set through collective-bargaining agreements.
We contribute to our U.S. and Canadian pension plans according to established funding standards. The funding standards for the plans are:
•	U.S. pension plans — according to the Employee Retirement Income Security Act of 1974; and
•	Canadian pension plans — according to the applicable provincial pension act and the Income Tax Act.
Postretirement benefits other than pensions. We provide certain postretirement health care and life insurance benefits for some retired employees. In some cases, we pay a portion of the cost of the benefit. Note 9: Pension and Other Postretirement Benefit Plans provides additional information about changes made in our postretirement benefit plans during 2014 and 2013.
Environmental Remediation
We accrue losses associated with environmental remediation obligations when such losses are probable and reasonably estimable. Future expenditures for environmental remediation obligations are not discounted to their present value. Recoveries of environmental remediation costs from other parties are recorded as assets when the recovery is deemed probable and does not exceed the amount of losses previously recorded.

BUSINESS_SEGMENTS

BUSINESS SEGMENTS	12 Months Ended
	Dec. 31, 2014
BUSINESS SEGMENTS	BUSINESS SEGMENTS
	Our business segments and how we account for those segments are discussed in Note 1: Summary of Significant Accounting Policies. This note provides key financial data by business segment.
	DISCONTINUED OPERATIONS
	We have disposed of Weyerhaeuser Real Estate Company (WRECO) that is excluded from the segment results below. See Note 3: Discontinued Operations for information regarding our discontinued operations and the segments affected.
	KEY FINANCIAL DATA BY BUSINESS SEGMENT
	Sales and Contribution (Charge) to Earnings
	DOLLAR AMOUNTS IN MILLIONS
		TIMBERLANDS			WOOD			CELLULOSE			UNALLOCATED ITEMS(1) AND INTERSEGMENT ELIMINATIONS			CONSOLIDATED
					PRODUCTS			FIBERS
	Sales to unaffiliated customers
	2014	$	1,497		$	3,970		$	1,936		$	—		$	7,403
	2013	$	1,343		$	4,009		$	1,902		$	—		$	7,254
	2012	$	1,077		$	3,058		$	1,854		$	—		$	5,989
	Intersegment sales
	2014	$	867		$	80		$	—		$	(947	)	$	—
	2013	$	799		$	71		$	—		$	(870	)	$	—
	2012	$	683		$	74		$	—		$	(757	)	$	—
	Contribution (charge) to earnings from continuing operations
	2014	$	613		$	327		$	291		$	126		$	1,357
	2013	$	470		$	441		$	200		$	(422	)	$	689
	2012	$	322		$	120		$	223		$	2		$	667
	(1) Unallocated Items are gains or charges not related to or allocated to an individual operating segment. They include a portion of items such as: share-based compensation, pension and postretirement costs, foreign exchange transaction gains and losses associated with financing, and the elimination of intersegment profit in inventory and the LIFO reserve.
	Management evaluates segment performance based on the contributions to earnings of the respective segments. An analysis and reconciliation of our business segment information to the consolidated financial statements follows:
	Reconciliation of Contribution to Earnings to Net Earnings Attributable to Weyerhaeuser
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Net contribution to earnings from continuing operations	$	1,357		$	689		$	667
	Net contribution to earnings from discontinued operations	1,017			116			121
	Total contribution to earnings	2,374			805			788
	Interest expense, net of capitalized interest (continuing and discontinued operations)	(347		)	(371		)	(348		)
	Income before income taxes (continuing and discontinued operations)	2,027			434			440
	Income taxes (continuing and discontinued operations)	(201		)	129			(55		)
	Net earnings attributable to Weyerhaeuser	$	1,826		$	563		$	385
	Additional Financial Information
	DOLLAR AMOUNTS IN MILLIONS
		TIMBERLANDS			WOOD			CELLULOSE			UNALLOCATED			CONSOLIDATED
					PRODUCTS			FIBERS			ITEMS
	Depreciation, depletion and amortization
	2014	$	207		$	119		$	155		$	12		$	493
	2013	$	166		$	123		$	156		$	13		$	458
	2012	$	142		$	133		$	150		$	19		$	444
	Net pension and postretirement cost (credit)(1)
	2014	$	10		$	24		$	11		$	(45	)	$	—
	2013	$	10		$	28		$	18		$	40		$	96
	2012	$	8		$	25		$	14		$	29		$	76
	Charges for restructuring, closures and impairments(2)
	2014	$	1		$	2		$	—		$	41		$	44
	2013	$	2		$	13		$	—		$	362		$	377
	2012	$	2		$	6		$	—		$	18		$	26
	Equity in income (loss) of equity affiliates and unconsolidated entities
	2014	$	—		$	—		$	(1	)	$	(1	)	$	(2	)
	2013	$	—		$	—		$	3		$	8		$	11
	2012	$	—		$	—		$	5		$	(3	)	$	2
	Capital expenditures
	2014	$	74		$	190		$	123		$	4		$	391
	2013	$	73		$	113		$	92		$	5		$	283
	2012	$	60		$	56		$	160		$	5		$	281
	Investments in and advances to equity affiliates and unconsolidated entities
	2014	$	—		$	—		$	188		$	—		$	188
	2013	$	—		$	—		$	190		$	—		$	190
	2012	$	—		$	—		$	191		$	1		$	192
	Total assets(3)(4)
	2014	$	7,327		$	1,430		$	2,214		$	2,486		$	13,457
	2013	$	7,578		$	1,326		$	2,299		$	3,374		$	14,577
2012	$	4,697		$	1,319		$	2,386		$	4,190		$	12,592
(1) Net pension and postretirement cost (credit) excludes special items, as well as the recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures. See Note 9: Pension and Other Postretirement Benefit Plans for more information.
(2)   See Note 18: Charges for Restructuring, Closures and Asset Impairments for more information
(3) Timberlands total assets increased primarily due to the acquisition of Longview Timber. See Note 4: Longview Timber Purchase for more information.
(4) Unallocated Items total assets includes assets of discontinued operations in 2013 and 2012.

DISCONTINUED_OPERATIONS

DISCONTINUED OPERATIONS	12 Months Ended
	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
DISCONTINUED OPERATIONS	DISCONTINUED OPERATIONS
	We have made certain reclassifications in our consolidated financial statements to reflect discontinued operations related to WRECO which was previously reported under the Real Estate segment and Unallocated Items.
	OPERATIONS INCLUDED IN DISCONTINUED OPERATIONS
	Divestiture of WRECO
	On July 7, 2014, we completed the following set of transactions resulting in our homebuilding and real estate development business becoming wholly-owned by TRI Pointe Homes, Inc. (TRI Pointe):
	•	the distribution of shares of WRECO to our shareholders in exchange for 59 million shares of our common stock; and
	•	the merger of WRECO into a special purpose subsidiary of TRI Pointe, with WRECO surviving the merger and becoming a wholly-owned subsidiary of TRI Pointe.
	Collectively, these transactions are referred to as the “Real Estate Divestiture”.
	During June 2014, our wholly-owned subsidiary, WRECO, issued $900 million of unsecured and unsubordinated senior debt obligations. The net proceeds after deducting the discount, underwriting fees and issuance costs were $870 million. At the close of the Real Estate Divestiture in July 2014, WRECO used $744 million of the debt proceeds to repay intercompany debt and interest to Weyerhaeuser Company. The newly issued debt, remaining proceeds and other WRECO assets and liabilities, including $5 million cash on hand, were acquired by TRI Pointe when WRECO became a wholly-owned subsidiary of TRI Pointe at the closing of the transaction. Additionally, $32 million related to the adjustment amount payable pursuant to the terms of the transaction agreement was paid to TRI Pointe. Our net cash proceeds in connection with the Real Estate Divestiture totaled $707 million.
	Prior to the distribution of WRECO shares to our shareholders, WRECO was a wholly-owned subsidiary. Concurrent with the distribution to shareholders, WRECO ceased being a subsidiary.
	The following table presents the components of the net gain on divestiture:
	DOLLAR AMOUNTS IN MILLIONS
		2014
	Proceeds:
	Common shares tendered (58,813,151 shares at $33.22 per share)	$	1,954
	Cash	707
		2,661
	Less:
	Net book value of contributed assets	(1,671		)
	Transaction costs, net of reimbursement	(18		)
		(1,689		)
	Gain on WRECO divestiture	$	972
	The net gain on the Real Estate Divestiture of $972 million is not taxable and was recognized in 2014 in discontinued operations.
	NET EARNINGS FROM DISCONTINUED OPERATIONS
	Sales and Net Earnings from Discontinued Operations
	DOLLAR AMOUNTS IN MILLIONS
		2014(1)			2013			2012
	Net sales from discontinued operations	$	573		$	1,275		$	1,070
	Income from discontinued operations	42			114			117
	Income taxes	(16		)	(42		)	(45		)
	Net income from operations	26			72			72
	Net gain on divestiture	972			—			—
	Net earnings from discontinued operations	998			$	72		$	72
	(1) Discontinued operations in 2014 covered only 188 days.
	Results of discontinued operations exclude certain general corporate overhead costs that have been allocated to and are included in contribution to earnings for the operating segments.
	CARRYING VALUE OF ASSETS AND LIABILITES OF DISCONTINUED OPERATIONS
	The following table shows carrying values for assets and liabilities classified as discontinued operations as of December 31, 2013.
	Carrying Value of Assets and Liabilities of Discontinued Operations
	DOLLAR AMOUNTS IN MILLIONS
		December 31, 2013
	Assets
	Cash and cash equivalents	$	5
	Receivables, less discounts and allowances	51
	Prepaid expenses	11
	Deferred tax assets	21
	Total current assets	88
	Property and equipment, net	15
	Real estate in process of development and for sale	851
	Land being processed for development	596
	Investments in and advances to equity affiliates	21
	Deferred tax assets	115
	Other assets	96
	Total noncurrent assets	1,694
	Total assets	$	1,782
	Liabilities
	Accounts payable	$	41
	Accrued liabilities	113
	Total current liabilities	154
	Long-term debt (nonrecourse to the company) held by variable interest entities	5
	Other liabilities	27
	Total noncurrent liabilities	32
	Total liabilities	$	186
	Noncontrolling interests	$	34

LONGVIEW_TIMBER_PURCHASE

LONGVIEW TIMBER PURCHASE	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
LONGVIEW TIMBER PURCHASE	LONGVIEW TIMBER PURCHASE
	On July 23, 2013, we purchased 100 percent of the equity interests in Longview Timber LLC (Longview Timber) for $1.58 billion cash and assumed debt of $1.07 billion, for an aggregate purchase price of $2.65 billion. Longview Timber was a privately-held Delaware limited liability company engaged in the ownership and management of approximately 645,000 acres of timberlands in Oregon and Washington. We believe Longview Timber has productive lands with favorable age class distribution that will provide us with optionality for harvest. Earnings, assets and liabilities from this business are reported as part of the Timberlands segment beginning in third quarter 2013.
	Summarized Unaudited Pro Forma Information that Presents Combined Amounts as if this Acquisition Occurred at the Beginning of 2012
	DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER-SHARE FIGURES
		2013		2012
	Net sales	$	7,371	$	6,166
	Net earnings from continuing operations attributable to Weyerhaeuser common shareholders	$	485	$	276
	Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, basic	$	0.84	$	0.48
	Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, diluted	$	0.83	$	0.47
	Estimated Fair Values of Identifiable Assets Acquired and Liabilities Assumed as of the Acquisition Date
	DOLLAR AMOUNTS IN MILLIONS
		July 23,		Measurement Period Adjustments		December 31,
		2013				2013
	Current assets	$	46	$	—	$	46
	Property and equipment	39		1		40
	Timber and timberlands	2,654		2		2,656
	Other assets	2		—		2
	Total assets acquired	2,741		3		2,744
	Current liabilities	10		—		10
	Long-term debt	1,122		—		1,122
	Other liabilities	5		3		8
	Total liabilities assumed	1,137		3		1,140
	Net assets acquired	$	1,604	$	—	$	1,604
	The initial allocations of purchase price were recorded at the estimated fair value of assets acquired and liabilities assumed based upon the best information available to management. The purchase price allocation was finalized in the fourth quarter 2013. The measurement period adjustments reflect additional information obtained to record the fair value of certain assets acquired and liabilities assumed based on facts and circumstances existing as of the acquisition date.
	In order to finance our purchase of Longview Timber, we issued the following:
	•	29 million common shares on June 24, 2013, at the price of $27.75 per share for net proceeds of $781 million;
	•	4.4 million common shares on July 8, 2013, at the price of $27.75 per share for net proceeds of $116 million, in connection with the exercise of an overallotment option; and
	•	13.8 million of our 6.375 percent Mandatory Convertible Preference Shares, Series A, par value $1.00 and liquidation preference of $50.00 per share on June 24, 2013, for net proceeds of $669 million. See Note 16: Shareholders' Interest for more information.
	For issuances of shares, excess of par value is recorded in "Other capital" in our Consolidated Balance Sheet.
	Proceeds were used to finance the acquisition and pay related fees and expenses. We paid $11 million in fees related to a bridge loan in 2013. As of the close of the Longview Timber purchase, we did not draw from the loan and these fees were expensed in 2013, which is recorded in "Interest expense" in our Consolidated Statement of Operations.
	We obtained additional debt financing in 2013 which was used to repay all of the assumed debt in 2013. See Note 13: Long-term Debt.

NET_EARNINGS_PER_SHARE

NET EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2014
NET EARNINGS PER SHARE	NET EARNINGS PER SHARE
	Our basic earnings per share attributable to Weyerhaeuser common shareholders for the last three years were:
	•	$3.20 in 2014,
	•	$0.95 in 2013 and
	•	$0.71 in 2012.
	Our diluted earnings per share attributable to Weyerhaeuser common shareholders for the last three years were:
	•	$3.18 in 2014,
	•	$0.95 in 2013 and
	•	$0.71 in 2012.
	This note discloses:
	•	how we calculate basic and diluted net earnings per share and
	•	shares excluded from dilutive effect.
	HOW WE CALCULATE BASIC AND DILUTED NET EARNINGS PER SHARE
	"Basic earnings" per share is net earnings available to common shareholders divided by the weighted average number of our outstanding common shares, including stock equivalent units where there is no circumstance under which those shares would not be issued.
	"Diluted earnings" per share is net earnings available to common shareholders divided by the sum of the:
	•	weighted average number of our outstanding common shares and
	•	the effect of our outstanding dilutive potential common shares.
	Dilutive potential common shares may include:
	•	outstanding stock options,
	•	restricted stock units,
	•	performance share units and
	•	preference shares.
	We use the treasury stock method to calculate the effect of our outstanding stock options, restricted stock units and performance share units. Share-based payment awards that are contingently issuable upon the achievement of specified performance or market conditions are included in our diluted earnings per share calculation in the period in which the conditions are satisfied.
	We use the if-converted method to calculate the effect of our outstanding preference shares. In applying the if-converted method, conversion is not assumed for purposes of computing diluted earnings per share if the effect would be antidilutive. Preference shares are antidilutive whenever the amount of the dividend declared in or accumulated for the current period per common share obtainable on conversion exceeds diluted earnings per share exclusive of the preference shares.
	Preference shares are evaluated for participation on a quarterly basis to determine whether two-class presentation is required. Preference shares are considered to be participating as of the financial reporting period end to the extent they would participate in dividends paid to common shareholders. Preference shares are not considered participating for the years ended December 31, 2014 and 2013. Under the provisions of the two-class method, basic and diluted earnings per share would be presented for both preference and common shareholders.
	SHARES EXCLUDED FROM DILUTIVE EFFECT
	The following shares were not included in the computation of diluted earnings per share because they were either antidilutive or the required performance or market conditions were not met. Some or all of these shares may be dilutive potential common shares in future periods.
	We issued 13.8 million 6.375 percent Mandatory Convertible Preference Shares, Series A on June 24, 2013. We do not include these shares in our calculation of diluted earnings per share because they are antidilutive. See Note 4: Longview Timber Purchase.
	Potential Shares Not Included in the Computation of Diluted Earnings per Share
	Shares in thousands	2014	2013	2012
	Stock options	—	4,618	3,519
	Preference Shares	24,988	24,865	—

INVENTORIES

INVENTORIES	12 Months Ended
	Dec. 31, 2014
INVENTORIES	INVENTORIES
	Inventories include raw materials, work-in-process and finished goods.
	Inventories as of the End of Our Last Two Years
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	LIFO inventories:
	Logs and chips	$	9	$	15
	Lumber, plywood and panels	55		46
	Pulp and paperboard	122		97
	Other products	11		11
	FIFO or moving average cost inventories:
	Logs and chips	38		33
	Lumber, plywood, panels and engineered wood products	80		70
	Pulp and paperboard	35		30
	Other products	96		94
	Materials and supplies	149		146
	Total	$	595	$	542
	If we used FIFO for all inventories, our stated inventories would have been $120 million and $112 million higher as of December 31, 2014 and December 31, 2013, respectively.
	HOW WE ACCOUNT FOR OUR INVENTORIES
	The Inventories section of Note 1: Summary of Significant Accounting Policies provides details about how we account for our inventories.

PROPERTY_AND_EQUIPMENT

PROPERTY AND EQUIPMENT	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT
	PROPERTY AND EQUIPMENT
	Property and equipment includes land, buildings and improvements, machinery and equipment, roads and other items.
	Carrying Value of Property and Equipment and Estimated Service Lives
	DOLLAR AMOUNTS IN MILLIONS
		RANGE OF LIVES	DECEMBER 31,			DECEMBER 31,
			2014			2013
	Property and equipment, at cost:
	Land	N/A	$	127		$	129
	Buildings and improvements	10–40	1,220			1,262
	Machinery and equipment	2–25	6,706			6,712
	Roads	10–20	609			594
	Other	3–10	285			319
	Total cost		8,947			9,016
	Allowance for depreciation and amortization		(6,324		)	(6,327		)
	Property and equipment, net		$	2,623		$	2,689
	SERVICE LIVES AND DEPRECIATION
	Buildings and improvements for property and equipment have estimated lives that are generally at either the high end or low end of the range from 10 years to 40 years, depending on the type and performance of construction.
	The maximum service lives for machinery and equipment varies among our operations:
	•	Timberlands — 15 years;
	•	Wood products manufacturing facilities — 20 years; and
	•	Pulp mills — 25 years.
	Depreciation expense, excluding discontinued operations, was:
	•	$332 million in 2014,
	•	$332 million in 2013 and
	•	$332 million in 2012.

EQUITY_AFFILIATES

EQUITY AFFILIATES	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
EQUITY AFFILIATES	EQUITY AFFILIATES
	We have investments in unconsolidated equity affiliates over which we have significant influence that we account for using the equity method with taxes provided on undistributed earnings. We record earnings and accrue taxes in the period that the earnings are recorded by the affiliates.
	Details About Our Equity Affiliates
	As of December 31, 2014, we hold a 50 percent ownership interest in North Pacific Paper Corporation (NORPAC). NORPAC owns and operates a newsprint manufacturing facility in Longview, Washington.
	During 2014, Catchlight Energy was dissolved. We received no proceeds from the dissolution.
	During 2013, we sold part of our investment in Liaison Technologies Inc. and recognized an $10 million pretax gain, which is recorded in "Interest income and other" in our Consolidated Statement of Operations. Our remaining investment is accounted for under the cost method.
	Unconsolidated Financial Information of Equity Affiliates
	Aggregated assets, liabilities and operating results of the entities that we accounted for as equity affiliates are provided below.
	Assets and Liabilities of Equity Affiliates
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Current assets	$	123		$	119
	Noncurrent assets	$	413		$	468
	Current liabilities	$	30		$	44
	Noncurrent liabilities	$	109		$	141
	Operating Results of Equity Affiliates
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013		2012
	Net sales	$	501		$	534	$	553
	Operating income (loss)	$	(2	)	$	3	$	3
	Net income (loss)	$	—		$	3	$	(7	)
	Doing Business with Affiliates
	We provide goods and services to NORPAC, including raw materials and support services. The amounts paid to Weyerhaeuser by NORPAC for goods and services were:
	•	$195 million in 2014,
	•	$203 million in 2013 and
	•	$221 million in 2012.
	In addition, we manage cash for NORPAC under a services agreement. Weyerhaeuser holds the cash and records a payable balance to NORPAC, which is included in accounts payable in the accompanying Consolidated Balance Sheet. We had the following payable balances to NORPAC:
	•	$75 million at December 31, 2014; and
	•	$93 million at December 31, 2013.

PENSION_AND_OTHER_POSTRETIREME

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS	12 Months Ended
	Dec. 31, 2014
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS	PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
	We sponsor several retirement programs for our employees.
	This note provides details about:
	•	types of plans we sponsor,
	•	significant transactions and events affecting plans we sponsor,
	•	funded status of plans we sponsor,
	•	pension assets,
	•	activity of plans we sponsor and
	•	actuarial assumptions.
	TYPES OF PLANS WE SPONSOR
	The plans we sponsor in the U.S. and Canada differ according to each country’s requirements.
	In the U.S., our pension plans are:
	•	qualified — plans that qualify under the Internal Revenue Code; and
	•	nonqualified — plans for select employees that provide additional benefits not qualified under the Internal Revenue Code.
	In Canada, our pension plans are:
	•	registered — plans that are registered under the Income Tax Act and applicable provincial pension acts; and
	•	nonregistered — plans for select employees that provide additional benefits that may not be registered under the Income Tax Act or provincial pension acts.
	We also offer retiree medical and life insurance plans in the U.S. and Canada. These plans are referred to as other postretirement benefit plans in the following disclosures.
	Employee Eligibility and Accounting
	The Pension and Other Postretirement Benefit Plans section of Note 1: Summary of Significant Accounting Policies provides information about employee eligibility for pension plans and postretirement health care and life insurance benefits, as well as how we account for the plans and benefits. See "Effects of Significant Transactions and Events" below for changes to eligibility in the pension and other postretirement benefit plans.
	Measurement Date
	We measure the fair value of pension plan assets and pension and other postretirement benefit obligations as of the end of our fiscal year. The fair value of pension plan assets are estimated at the end of the year and are revised in the first half of the following year when the information needed to finalize fair values is received. Additionally, we receive updated census data that is used to estimate our projected benefit obligation. As a result of the Real Estate Divestiture as well as our selling, general and administrative cost reduction initiative, we remeasured our U.S. qualified pension plan during third quarter 2014. There were no significant events that triggered remeasurement in 2013.
	EFFECTS OF SIGNIFICANT TRANSACTIONS AND EVENTS
	The information that is provided in this note is affected by the following transactions and events.
	Amendments of Pension and Other Postretirement Benefit Plans for Salaried Employees
	Pension Benefit Plan Amendments
	During fourth quarter 2013, we ratified an amendment to the Weyerhaeuser Pension Plan that closes the plan to newly hired and rehired salaried or non union employees effective January 1, 2014. Certain union employee groups adopted similar amendments effective at other dates. Beginning at the effective date, new hires and rehires into groups affected by these amendments will receive a company contribution for retirement in their 401(k) plan. The change was announced in December 2013.
	During fourth quarter 2013, we ratified amendments to the Weyerhaeuser Company Limited Retirement Plan for Non-Union Employees and the Retirement Plan for Non-Union Employees of Weyerhaeuser Company Limited at Grand Prairie, Alberta and Grande Cache, Alberta that (1) closes these plans to new hires and rehires effective January 1, 2014 and (2) changes the early retirement reduction for current employees enrolled in these plans, effective for future years of service beginning January 1, 2016. These changes were announced to participants in December 2013.
	Postretirement Medical and Life Insurance Benefit Plan Amendments
	During fourth quarter 2014, the decision was ratified to reinstate or modify available options for U.S. and Canadian postretirement benefits for certain retirees. As a result, our postretirement obligation increased by $45 million.
	During fourth quarter 2013, the decision was ratified to eliminate Company funding of the Post-Medicare Health Reimbursement Account (HRA) for certain salaried retirees after 2014. This change was communicated to affected retirees during January 2014. As a result, we recognized a pretax gain of $151 million in 2014 from this plan amendment.
	Midyear Remeasurement of Assets and Liabilities
	Our pension plans are typically remeasured as of fiscal year-end unless a significant event occurs that requires remeasurement. As a result of the Real Estate Divestiture as well as our selling, general and administrative cost reduction initiative, we remeasured our U.S. qualified pension plan during third quarter 2014.
	The net effect of the remeasurement was as follows:
	•	We recognized a $9 million charge in third quarter 2014 for curtailments and special termination benefits. Of this amount, $6 million is included in the net gain on the Real Estate Divestiture and is presented in "Earnings from discontinued operations, net of income taxes" in our Consolidated Statement of Operations. The remaining $3 million is included in "Charges for restructuring, closures and impairments" in our Consolidated Statement of Operations.
	•	The funded status of our U.S. qualified pension plan was reduced by $291 million primarily as a result of a decline in the discount rate used to calculate the projected benefit obligation and also due to asset performance and curtailment and special terminations. The discount rate used to remeasure the pension plans’ liabilities was changed from a rate of 4.9 percent at December 31, 2013 to rates reflective of current bond rates on the remeasurement date. A discount rate of 4.4 percent was used as of July 7, 2014. There was no change to the expected rate of return assumption.
	•	Deferred tax liabilities decreased $108 million.
	•	Total equity decreased $183 million for changes in "Cumulative other comprehensive loss", reflecting the net effect of the items discussed above. Amounts deferred in cumulative other comprehensive loss will be amortized into net periodic pension cost (credits) in future periods.
	FUNDED STATUS OF PLANS WE SPONSOR
	The funded status of the plans we sponsor is determined by comparing the projected benefit obligation with the fair value of plan assets at the end of the year.
	Changes in Projected Benefit Obligations of Our Pension and Other Postretirement Benefit Plans
	DOLLAR AMOUNTS IN MILLIONS
		PENSION						OTHER
								POSTRETIREMENT
								BENEFITS
		2014			2013			2014			2013
	Reconciliation of projected benefit obligation:
	Projected benefit obligation beginning of year	$	5,834		$	6,575		$	321		$	433
	Service cost	53			64			1			1
	Interest cost	271			244			10			12
	Plan participants’ contributions	—			—			13			16
	Actuarial (gains) losses	1,006			(666		)	4			(23		)
	Foreign currency exchange rate changes	(87		)	(66		)	(7		)	(5		)
	Benefits paid (includes lump sum settlements)	(391		)	(317		)	(44		)	(50		)
	Plan amendments and other	1			—			2			(66		)
	Special/contractual termination benefits	7			—			—			—
	Plan transfer/Acquisitions	4			—			3			3
	Projected benefit obligation at end of year	$	6,698		$	5,834		$	303		$	321
	Changes in Fair Value of Plan Assets
	DOLLAR AMOUNTS IN MILLIONS
		PENSION						OTHER
								POSTRETIREMENT
								BENEFITS
		2014			2013			2014			2013
Fair value of plan assets at beginning of year (estimated)	$	5,614		$	5,022		$	—		$	—
Adjustment for final fair value of plan assets	53			55			—			—
Actual return on plan assets	368			808			—			—
Foreign currency exchange rate changes	(75		)	(57		)	—			—
Employer contributions and benefit payments	70			103			31			34
Plan participants’ contributions	—			—			13			16
Plan transfer/Acquisitions	4			—			—			—
Benefits paid (includes lump sum settlements)	(391		)	(317		)	(44		)	(50		)
Fair value of plan assets at end of year (estimated)	$	5,643		$	5,614		$	—		$	—
Funded Status of Our Pension and Other Postretirement Benefit Plans
DOLLAR AMOUNTS IN MILLIONS
	PENSION						OTHER
							POSTRETIREMENT
							BENEFITS
	2014			2013			2014			2013
Noncurrent assets	$	8		$	35		$	—		$	—
Current liabilities	(21		)	(22		)	(26		)	(35		)
Noncurrent liabilities	(1,042		)	(233		)	(277		)	(283		)
Funded status	$	(1,055	)	$	(220	)	$	(303	)	$	(318	)
Changes in actuarial assumptions had a negative effect on the funded status of the pension and postretirement plans as of the end of 2014. The primary actuarial assumption changes were driven by a change in the discount rates as well as adoption of the updated mortality tables for the U.S. pension and postretirement plans. The Company elected to implement the mortality assumption published by the Society of Actuaries in October 2014, effective December 31, 2014. The updated mortality tables accounted for $387 million of the increase to the pension liabilities as well as $11 million of the increase to the postretirement liabilities as of December 31, 2014. The discount rates decreased from 4.90 percent at the end of 2013 to 4.10 percent at the end of 2014 for the U.S. pension plans, and decreased from 4.0 percent at the end of 2013 to 3.60 percent at the end of 2014 for U.S. postretirement. The discount rates decreased from 4.70 percent at the end of 2013 to 3.90 percent at the end of 2014 for the Canadian pension plans, and decreased from 4.60 percent at the end of 2013 to 3.80 percent at the end of 2014 for Canadian postretirement.
Our qualified and registered pension plans and a portion of our nonregistered pension plans are funded. We contribute to these plans according to established funding standards. The nonqualified pension plan, a portion of the nonregistered pension plans, and the other postretirement benefit plans are unfunded. For the unfunded plans, we pay benefits to retirees from our general assets as they come due.
The values reported for our pension plan assets at the end of 2014 and 2013 were estimated. Additional information regarding the year-end values generally becomes available to us during the first half of the following year. We increased the fair value of plan assets by $53 million to reflect final valuations as of December 31, 2013.
During 2014, we contributed $43 million for our Canadian registered plans, we made contributions and benefit payments of $3 million for our Canadian nonregistered pension plans and made benefit payments of $24 million for our nonqualified pension plans.
The asset or liability on our Consolidated Balance Sheet representing the funded status of the plans is different from the cumulative income or expense that we have recorded related to these plans. These differences are actuarial gains and losses and prior service costs and credits that are deferred and will be amortized into our periodic benefit costs in future periods. These unamortized amounts are recorded in "Cumulative Other Comprehensive Loss", which is a component of total equity on our Consolidated Balance Sheet. The Cumulative Other Comprehensive Income (Loss) section of Note 16: Shareholder's Interest details changes in the amounts included in cumulative other comprehensive income (loss) by component.
Accumulated Benefit Obligations Greater Than Plan Assets
As of December 31, 2014, pension plans with accumulated benefit obligations greater than plan assets had:
•	$6.6 billion in projected benefit obligations,
•	$6.5 billion in accumulated benefit obligations and
•	assets with a fair value of $5.6 billion.
As of December 31, 2013, pension plans with accumulated benefit obligations greater than plan assets had:
•	$971 million in projected benefit obligations,
•	$948 million in accumulated benefit obligations and
•	assets with a fair value of $726 million.
The accumulated benefit obligation for all of our defined benefit pension plans was:
•	$6.5 billion at December 31, 2014; and
•	$5.7 billion at December 31, 2013.
PENSION ASSETS
Our Investment Policies and Strategies
Our investment policies and strategies guide and direct how we manage funds for the benefit plans we sponsor. These funds include our:
•	U.S. Pension Trust — funds our U.S. qualified pension plans;
•	Canadian Pension Trust — funds our Canadian registered pension plans; and
•	Retirement Compensation Arrangements — fund a portion of our Canadian nonregistered pension plans.
U.S. and Canadian Pension Trusts
Our U.S. pension trust holds the funds for our U.S. qualified pension plans, while our Canadian pension trust holds the funds for our Canadian registered pension plans.
Our strategy within the trusts is to invest:
•	directly in a diversified mix of nontraditional investments; and
•	indirectly through derivatives to promote effective use of capital, increase returns and manage associated risk.
Consistent with past practice and in accordance with investment guidelines established by the company’s investment committee, the investment managers of the company’s pension plan asset portfolios utilize a diversified set of investment strategies.
Our direct investments include:
•	cash and short-term investments,
•	hedge funds,
•	private equity,
•	real estate fund investments and
•	common and preferred stocks.
Our indirect investments include:
•	equity index derivatives,
•	fixed income derivatives and
•	swaps and other derivative instruments.
The overall return for our pension trusts includes:
•	returns earned on our direct investments and
•	returns earned on the derivatives we use.
Cash and short-term investments generally consist of highly liquid money market and government securities and are primarily held to fund benefit payments, capital calls and margin requirements.
Hedge fund investments generally consist of privately-offered managed pools primarily structured as limited liability entities, with the general members or partners of such limited liability entities serving as portfolio manager and thus being responsible for the fund’s underlying investment decisions. Generally, these funds have varying degrees of liquidity and redemption provisions. Underlying investments within these funds may include long and short public and private equities, corporate, mortgage and sovereign debt, options, swaps, forwards and other derivative positions. These funds may also use varying degrees of leverage.
Private equity investments consist of investments in private equity, mezzanine, distressed, co-investments and other structures. Private equity funds generally participate in buyouts and venture capital of limited liability entities through unlisted equity and debt instruments. These funds may also employ borrowing at the underlying entity level. Mezzanine and distressed funds generally follow strategies of investing in the debt of public or private companies with additional participation through warrants or other equity type options.
Real estate fund investments in real property may be initiated through private transactions between principals or public market vehicles such as real estate investment trusts and are generally held in limited liability entities.
Common and preferred stocks are equity instruments that generally have resulted from transactions related to private equity investment holdings.
Swaps and other derivative instruments generally are comprised of swaps, futures, forwards or options. In accordance with our investment risk and return objectives, some of these instruments are utilized to achieve target equity and bond asset exposure or to reduce exposure to certain market risks or to help manage the liquidity of our investments. The resulting asset mix achieved is intended to allow the assets to perform comparably with established benchmarks. Others, mainly total return swaps with limited exchange of principal, are designed to gain exposure to the return characteristics of specific financial strategies.
All swap, forward and option contracts are executed in a diversified manner through a number of financial institutions and in accordance with our investment guidelines.
Retirement Compensation Arrangements
Retirement Compensation Arrangements fund a portion of our Canadian nonregistered pension plans.
Under Retirement Compensation Arrangements, our contributions are split:
•	50 percent to our investments in a portfolio of equities; and
•	50 percent to a noninterest-bearing refundable tax account held by the Canada Revenue Agency — as required by Canadian tax rules.
The Canadian tax rules requirement means that — on average, over time — approximately 50 percent of our Canadian nonregistered pension plans’ assets do not earn returns.
Managing Risk
Investments and contracts, in general, are subject to risk, including market price, liquidity, currency, interest rate and credit risks. We have established governance practices to manage certain risks. The following provides an overview of these risks and describes actions we take to mitigate the potential adverse effects of these risks on the performance of our pension plan assets. Generally, we manage these risks through:
•	selection and diversification of managers and strategies,
•	use of limited-liability vehicles,
•	diversification and
•	constraining risk profiles to predefined limits on the percentage of pension trust assets that can be invested in certain categories.
Market price risk is the risk that the future value of a financial instrument will fluctuate as a result of changes in its market price, whether caused by factors specific to the individual investment, its issuer, or any other market factor that may affect its price. We attempt to mitigate market price risk on the company’s pension plan asset portfolios by investing in a diversified set of assets whose returns exhibit low correlation to those of traditional asset classes and each other. In addition, we and our investment advisers monitor the investments on a regular basis to ensure the decision to invest in particular assets continues to be suitable, including performing ongoing qualitative and quantitative assessments and comprehensive investment and operational due diligence. Special attention is paid to organizational changes made by the underlying fund managers and to changes in policy relative to their investment objectives, valuation, hedging strategy, degree of diversification, leverage, alignment of fund principles and investors, risk governance and costs.
Liquidity risk is the risk that the pension trusts will encounter difficulty in meeting obligations associated with their financial liabilities. Our financial obligations as they relate to the pension plans may consist of distributions and redemptions payable to pension plan participants, payments to counterparties and fees to service providers. As established, pension plan assets primarily consist of investments in limited liability pools for which there is no active secondary market. As a result, the investments may be illiquid. Further, hedge funds are subject to potential restrictions that may affect the timing of the realization of pending redemptions. Private equity funds are subject to distribution and funding schedules that are set by the private equity funds’ respective managers and market activity. To mitigate liquidity risk on the company’s pension plan asset portfolios, the hedge fund portfolios have been diversified across manager’s strategies and funds that possess varying liquidity provisions and the private equity portfolios have been diversified across different vintage years and strategies. In addition, the investment committee regularly reviews cash flows of the pension trusts and sets appropriate guidelines to address liquidity needs.
Currency risk arises from holding pension plan assets denominated in a currency other than the currency in which its liabilities are settled. Such risk is managed generally through notional contracts designed to hedge the net exposure to non-functional currencies.
Interest rate risk is the risk that a change in interest rates will adversely affect the fair value of fixed income securities. The pension trust’s primary exposure to interest rate risk is indirect and through their investments in limited liability pools. Such indirect exposure is managed by the respective fund managers in conjunction with their investment level decisions and predefined investment mandates.
Credit risk relates to the extent to which failures by counterparties to discharge their obligations could reduce the amount of future cash flows on hand at the balance sheet date. The pension trusts’ exposure to counterparty credit risk is reflected in settlement receivables from derivative contracts within the pension plan assets. In evaluating credit risk, we will often be dependent upon information provided by the counterparty or a rating agency, which may be inaccurate. We decrease exposure to credit risk by only dealing with highly-rated financial counterparties, and as of year-end, our counterparties each had a credit rating of at least A from Standard and Poor’s.
We further manage this risk through:
•	diversification of counterparties,
•	predefined settlement and margining provisions and
•	documented agreements.
We expect that none of our counterparties will fail to meet its obligations. Also, no principal is at risk as a result of these types of investments. Only the amount of unsettled net receivables is at risk.
We are also exposed to credit risk indirectly through counterparty relationships struck by the underlying managers of investments in limited liability pools. This indirect exposure is mitigated through a due diligence process, which focuses on monitoring each investment fund to ensure the decision to invest in or maintain exposure to a fund continues to be suitable for the pension plans’ asset portfolios.
While we do not target specific direct investment or derivative allocations, we have established guidelines on the percentage of pension trust assets that can be invested in certain categories to provide diversification by investment type fund and investment managers, as well as to manage overall liquidity.
Assets within our qualified and registered pension plans in our U.S. and Canadian pension trusts were invested as follows:
	DECEMBER 31,		DECEMBER 31,
	2014		2013
Fixed income	12.2	%	11.4	%
Hedge funds	60.6		57.5
Private equity and related funds	25.3		28.6
Real estate and related funds	1.4		1.8
Common and preferred stock and equity index instruments	0.7		0.9
Accrued liabilities	(0.2	)	(0.2	)
Total	100	%	100	%
Assets within our nonregistered plans that we are allowed to manage were invested as follows:
	DECEMBER 31,		DECEMBER 31,
	2014		2013
Equities	52.8	%	55.5	%
Cash and cash equivalents	47.2		44.5
Total	100	%	100	%
Valuation of Our Plan Assets
The pension assets are stated at fair value based upon the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the reporting date. We do not value pension investments based upon a forced or distressed sale scenario. Instead, we consider both observable and unobservable inputs that reflect assumptions applied by market participants when setting the exit price of an asset or liability in an orderly transaction within the principal market of that asset or liability.
We value the pension plan assets based upon the observability of exit pricing inputs and classify pension plan assets based upon the lowest level input that is significant to the fair value measurement of the pension plan assets in their entirety. The fair value hierarchy we follow is outlined below;
Level 1: Inputs are unadjusted quoted prices for identical assets and liabilities traded in an active market.
Level 2: Inputs are quoted prices in non-active markets for which pricing inputs are observable either directly or indirectly at the reporting date.
Level 3: Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
The pension assets are comprised of cash and short-term investments, derivative contracts, common and preferred stock and fund units. The fund units are typically limited liability interests in hedge funds, private equity funds, real estate funds and cash funds. Each of these assets participates in its own unique principal market.
Cash and short-term investments, when held directly, are valued at cost.
Common and preferred stocks are valued at exit prices quoted in the public markets.
Derivative contracts held by our pension trusts are not publicly traded and each derivative contract is specifically negotiated with a unique financial counterparty and references either illiquid fund units or a unique number of synthetic units of a publicly reported market index. The derivative contracts are valued based upon valuation statements received from the financial counterparties.
Fund units are valued based upon the net asset values of the funds which we believe represent the per-unit prices at which new investors are permitted to invest and the prices at which existing investors are permitted to exit. To the degree net asset values as of the end of the year have not been received, we use the most recently reported net asset values and adjust for market events and cash flows that have occurred between the interim date and the end of the year to estimate the fair values as of the end of the year.
Assets that do not have readily available quoted prices in an active market require a higher degree of judgment to value and have a higher degree of risk that the value that could have been realized upon sale as of the valuation date could be different from the reported value than assets with observable pricing inputs. It is possible that the full extent of market price, liquidity, currency, interest rate, or credit risks may not be fully factored into the fair values of our pension plan assets that use significant unobservable inputs. Approximately $4.8 billion, or 85.8 percent, of our pension plan assets were classified as Level 3 assets as of December 31, 2014.
We estimate the fair value of pension plan assets based upon the information available during the year-end reporting process. In some cases, primarily private equity funds, the information available consists of net asset values as of an interim date, cash flows between the interim date and the end of the year, and market events. When the difference is significant, we revise the year-end estimated fair value of pension plan assets to incorporate year-end net asset values received after we have filed our annual report on Form 10-K. We increased the fair value of pension assets in the second quarter of 2014 by $53 million, or 1.0 percent.
The net pension plan assets, when categorized in accordance with this fair value hierarchy, are as follows:
DOLLAR AMOUNTS IN MILLIONS
2014	Level 1			Level 2			Level 3			Total
Pension trust investments:
Fixed income instruments	$	646		$	36		$	3		$	685
Hedge funds	103			(22		)	3,333			3,414
Private equity and related funds	—			3			1,422			1,425
Real estate and related funds	—			—			82			82
Common and preferred stock and equity index instruments	25			12			—			37
Total pension trust investments	$	774		$	29		$	4,840		$	5,643
Accrued liabilities, net										(13		)
Pension trust net assets										$	5,630
Canadian nonregistered plan assets:
Cash	$	7		$	—		$	—		$	7
Investments	6			—			—			6
Total Canadian nonregistered plan assets	$	13		$	—		$	—		$	13
Total plan assets										$	5,643
DOLLAR AMOUNTS IN MILLIONS
2013	Level 1			Level 2			Level 3			Total
Pension trust investments:
Fixed income instruments	$	567		$	68		$	3		$	638
Hedge funds	—			(7		)	3,225			3,218
Private equity and related funds	—			(2		)	1,606			1,604
Real estate and related funds	—			—			101			101
Common and preferred stock and equity index instruments	23			29			—			52
Total pension trust investments	$	590		$	88		$	4,935		$	5,613
Accrued liabilities, net										(13		)
Pension trust net investments										$	5,600
Canadian nonregistered plan assets:
Cash	$	8		$	—		$	—		$	8
Investments	6			—			—			6
Total Canadian nonregistered plan assets	$	14		$	—		$	—		$	14
Total plan assets										$	5,614
A reconciliation of the beginning and ending balances of the pension plan assets measured at fair value using significant unobservable inputs (Level 3) is presented below:
DOLLAR AMOUNTS IN MILLIONS
	INVESTMENTS
	Hedge funds			Private equity  and			Real estate and			Fixed Income			Total
				related funds			related funds
Balance as of December 31, 2012	$	2,767		$	1,577		$	91		$	4		$	4,439
Net realized gains (losses)	164			90			(19		)	—			235
Net change in unrealized appreciation (depreciation)	275			138			23			(1		)	435
Purchases	743			188			29			—			960
Sales	(645		)	(387		)	(23		)	—			(1,055		)
Settlements	(79		)	—			—			—			(79		)
Balance as of December 31, 2013	3,225			1,606			101			3			4,935
Net realized gains (losses)	186			128			8			—			322
Net change in unrealized appreciation (depreciation)	76			(130		)	(4		)	—			(58		)
Purchases	541			177			5			—			723
Sales	(540		)	(359		)	(28		)	—			(927		)
Issuances	52			—			—			—			52
Settlements	(132		)	—			—			—			(132		)
Transfers, Out(1)	$	(75	)	—			—			—			(75		)
Balance as of December 31, 2014	$	3,333		$	1,422		$	82		$	3		$	4,840
(1) One hedge fund completed an initial public offering during 2014; as such the security was transferred from Level 3 to Level 1 in 2014.
This table shows the fair value of the derivatives held by our pension trusts — which fund our qualified and registered plans — at the end of the last two years.
DOLLAR AMOUNTS IN MILLIONS
	DECEMBER 31,			DECEMBER 31,
	2014			2013
Equity index instruments	$	13		$	29
Forward contracts	(32		)	(9		)
Swaps	436			405
Total	$	417		$	425
This table shows the aggregate notional amount of the derivatives held by our pension trusts — which fund our qualified and registered plans — at the end of the last two years.
DOLLAR AMOUNTS IN MILLIONS
	DECEMBER 31,			DECEMBER 31,
	2014			2013
Equity index instruments	$	361		$	399
Forward contracts	535			638
Swaps	1,824			1,568
Total	$	2,720		$	2,605
ACTIVITY OF PLANS WE SPONSOR
Net Periodic Benefit Cost (Credit)
DOLLAR AMOUNTS IN MILLIONS
	PENSION									OTHER POSTRETIREMENT
										BENEFITS
	2014			2013			2012			2014			2013			2012
Net periodic benefit cost (credit):
Service cost(1)	$	53		$	64		$	53		$	1		$	1		$	1
Interest cost	271			244			262			10			12			15
Expected return on plan assets	(467		)	(439		)	(422		)	—			—			—
Amortization of actuarial loss	125			221			175			12			14			13
Amortization of prior service cost (credit)(2)(3)	5			7			7			(161		)	(23		)	(127		)
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	9			—			—			—			—			—
Other	—			—			—			(4		)	—			4
Net periodic benefit cost (credit)	$	(4	)	$	97		$	75		$	(142	)	$	4		$	(94	)
(1)  Service cost includes $2 million in 2014, $4 million in 2013 and $3 million in 2012 for employees that were part of the Real Estate Divestiture. These charges are included in our results of discontinued operations. Curtailment and special termination benefits are related to involuntary terminations, due to restructuring activities, as well as the Real Estate Divestiture.
(2) During fourth quarter 2011, we ratified amendments to our postretirement medical and life insurance benefit plans for U.S. salaried employees that reduced or eliminated certain benefits that were available to both past and present employees. The company recognized a gain of $103 million in 2012 due to these benefit changes. This gain is included in other operating income and reflected in the amortization of prior service credit in the table above. The benefit related to the fourth quarter 2011 amendments was fully recognized in first and second quarter 2012.
(3) During fourth quarter 2013, the decision was ratified to eliminate Company funding of the Post-Medicare Health Reimbursement Account (HRA) for certain salaried retirees after 2014. This change was communicated to affected retirees during January 2014. As a result, we recognized a pretax gain of $151 million in 2014 from this plan amendment.
Estimated Amortization from Cumulative Other Comprehensive Loss in 2015
Amortization of the net actuarial loss and prior service cost (credit) of our pension and postretirement benefit plans will affect our other comprehensive income in 2015. The net effect of the estimated amortization will be an increase in net periodic benefit costs or a decrease in net periodic benefit credits in 2015.
DOLLAR AMOUNTS IN MILLIONS
	PENSION			OTHER POSTRETIREMENT BENEFITS			TOTAL
Net actuarial loss	$	178		$	10		$	188
Prior service cost (credit)	4			(9		)	(5		)
Net effect cost	$	182		$	1		$	183
Expected Pension Funding
Established funding standards govern the funding requirements for our qualified and registered pension plans. We fund the benefit payments of our nonqualified and nonregistered plans as benefit payments come due.
During 2015, based on estimated year-end asset values and projections of plan liabilities, we expect to:
•	be required to contribute approximately $38 million for our Canadian registered plan;
•	be required to contribute or make benefit payments for our Canadian nonregistered plans of $3 million; and
•	make benefit payments of approximately $19 million for our U.S. nonqualified pension plans.
We do not anticipate a contribution being required for our U.S. qualified pension plan for 2015.
Expected Postretirement Benefit Funding
Our retiree medical and life insurance plans are unfunded. Benefits for these plans are paid from our general assets as they come due. We expect to make benefit payments of $26 million for our U.S. and Canadian other postretirement benefit plans in 2015, including $9 million expected to be required to cover benefit payments under collectively bargained contractual obligations.
Estimated Projected Benefit Payments for the Next 10 Years
DOLLAR AMOUNTS IN MILLIONS
	PENSION			OTHER
				POSTRETIREMENT
				BENEFITS
2015	$	348		$	26
2016	$	354		$	25
2017	$	361		$	24
2018	$	370		$	23
2019	$	379		$	22
2020-2024	$	1,979		$	98
ACTUARIAL ASSUMPTIONS
We use actuarial assumptions to estimate our benefit obligations and our net periodic benefit costs.
Rates We Use in Estimating Our Benefit Obligations
We use assumptions to estimate our benefit obligations that include:
•	discount rates in the U.S. and Canada, including discount rates used to value lump sum distributions;
•	rates of compensation increases for our salaried and hourly employees in the U.S. and Canada; and
•	estimated percentages of eligible retirees who will elect lump sum payments of benefits.
Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation
	PENSION				OTHER POSTRETIREMENT
					BENEFITS
	DECEMBER 31,		DECEMBER 31,		DECEMBER 31,		DECEMBER 31,
	2014		2013		2014		2013
Discount rates:
United States	4.1	%	4.9	%	3.6	%	4	%
Canada	3.9	%	4.7	%	3.8	%	4.6	%
Lump sum distributions (US salaried and nonqualified plans only)(1)	PPA Table		PPA Table		N/A		N/A
Rate of compensation increase:
Salaried:
United States	2.50% for 2014, 2015		2.50% for 2013, 2014		N/A		N/A
	and 3.50% thereafter		and 3.50% thereafter
Canada	2.50% for 2014, 2015		2.50% for 2013, 2014		N/A		N/A
	and 3.50% thereafter		and 3.50% thereafter
Hourly:
United States	3	%	3	%	3	%	3	%
Canada	3.25	%	3.25	%	N/A		N/A
Election of lump sum or installment distributions (US salaried and nonqualified plans only)	60	%	60	%	N/A		N/A
(1) The PPA Phased Table: Interest and mortality assumptions as mandated by Pension Protection Act of 2006 including the phase out of the prior interest rate basis in 2013.
Estimating Our Net Periodic Benefit Costs
The assumptions we use to estimate our net periodic benefit costs include:
•	discount rates in the U.S. and Canada, including discount rates used to value lump sum distributions;
•	expected returns on our plan assets;
•	rates of compensation increases for our salaried and hourly employees in the U.S. and Canada; and
•	estimated percentages of eligible retirees who will elect lump sum payments of benefits.
This table shows the discount rates, expected returns on our plan assets and rates of compensation increases we used the last three years to estimate our net periodic benefit costs.
Rates Used to Estimate Our Net Periodic Benefit Costs
	PENSION			OTHER
				POSTRETIREMENT
				BENEFITS
	2014	2013	2012	2014	2013	2012
Discount rates:
United States	4.90% for the first half of 2014 and 4.40% for the second half of 2014	3.70%	4.50%	4.00%	3.00%	4.10%
Salaried – lump sum distributions (U.S. salaried and nonqualified plan only)(1)	PPA Table	PPA phased	PPA phased	N/A	N/A	N/A
		Table	Table
Canada	4.70%	4.10%	4.90%	4.60%	4.00%	4.80%
Expected return on plan assets:
Qualified/registered plans	9.00%	9.00%	9.00%
Nonregistered plans (Canada only)	3.50%	3.50%	3.50%
Rate of compensation increase:
Salaried:
United States	2.50% for 2014	2.50% for 2013	2.00% for 2012	N/A	N/A	N/A
	and 3.50% thereafter	and 3.50% thereafter	and 3.50% thereafter
Canada	2.50% for 2014	2.50% for 2013	2.10% for 2012	N/A	N/A	N/A
	and 3.50%  thereafter	and 3.50%  thereafter	and 3.50% thereafter
Hourly:
United States	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
Canada	3.25%	3.25%	3.25%	N/A	N/A	N/A
Election of lump sum distributions (U.S. salaried and nonqualified plans only)	60.00%	56.00%	60.00%	N/A	N/A	N/A
(1) PPA Phased Table: Interest and mortality assumptions as mandated by Pension Protection Act of 2006 including the phase out of the prior interest rate basis in 2013.
Expected Return on Plan Assets
We estimate the expected long-term return on assets for our:
•	qualified and registered pension plans and
•	nonregistered plans.
Qualified and Registered Pension Plans. Our expected long-term rate of return for plan assets as of December 31, 2014, is comprised of:
•	a 7.3 percent assumed return from direct investments and
•	a 1.7 percent assumed return from derivatives.
Determining our expected return:
•	requires a high degree of judgment,
•	uses our historical fund returns as a base and
•	places added weight on more recent pension plan asset performance.
Over the 30 years it has been in place, our U.S. pension trust investment strategy has achieved a 14.6 percent net compound annual return rate. The past 5 years, our net compounded annual return was 10.6 percent.
Nonregistered plans. Canadian tax rules require that 50 percent of the assets for nonregistered plans go to a noninterest-bearing refundable tax account. As a result, the return we earn investing the other 50 percent is spread over 100 percent of the assets.
Our expected long-term annual rate of return on the equity portion of this portfolio — the portion we are allowed to invest and manage — is 7 percent. We base that expected rate of return on:
•	historical experience and
•	future return expectations.
Our expected overall annual return on assets that fund our nonregistered plans is 3.5 percent.
Actual Returns on Assets Held by Our Pension Trusts
Based on valuations received as of year-end, our total actual return on assets held by our pension trusts was a gain of approximately $368 million in 2014. These trusts fund our qualified, registered and a portion of our nonregistered pension plans.
DOLLAR AMOUNTS IN MILLIONS
	2014			2013			2012
Direct investments	$	258		$	568		$	324
Derivatives	110			240			166
Total	$	368		$	808		$	490
HEALTH CARE COSTS
Rising costs of health care affect the costs of our other postretirement plans.
Health Care Cost Trend Rates
We use assumptions about health care cost trend rates to estimate the cost of benefits we provide. In 2014, the assumed weighted health care cost trend rate was:
•	6.4 percent in the U.S. and
•	5.7 percent in Canada.
This table shows the assumptions we use in estimating the annual cost increase for health care benefits we provide.
Assumptions We Use in Estimating Health Care Benefit Costs
	2014				2013
	U.S.		CANADA		U.S.		CANADA
Weighted health care cost trend rate assumed for next year	6.3	%	5.6	%	6.4	%	5.7	%
Rate to which cost trend rate is assumed to decline (ultimate trend rate)	4.5	%	4.3	%	4.5	%	4.3	%
Year that the rate reaches the ultimate trend rate	2029		2028		2029		2028
The assumed health care cost trend rate can significantly influence projected postretirement benefit plan payments. Some of the benefits are defined dollar amounts and are unaffected by changes in health care costs. To determine the health care cost trend rate, we look at historical market experience, current environment and future expectations. The following table demonstrates the effect a 1 percent change in assumed health care cost trend rates would have with all other assumptions remaining constant.
Effect of a 1 Percent Change in Health Care Costs
AS OF DECEMBER 31, 2014 (DOLLAR AMOUNTS IN MILLIONS)
	1% INCREASE			1% DECREASE
Effect on total service and interest cost components	less than $1			less than $(1)
Effect on accumulated postretirement benefit obligation	$	14		$	(12	)
UNION-ADMINISTERED MULTIEMPLOYER BENEFIT PLANS
We contribute to multiemployer defined benefit plans under the terms of collective-bargaining agreements that cover some of our union-represented employees.
The U.S. plans are established to provide retirement income for eligible employees who meet certain age and service requirements at retirement. The benefits are generally based on:
•	a percentage of the employer contributions paid into the plan on the eligible employee's behalf or
•	a formula considering an eligible employee's service, the total contributions paid on their behalf plus a benefit based on the value of an eligible employee's account.
The Canadian plan is a negotiated cost defined benefit plan. The plan is established to provide retirement income for members based on their number of years of service in the industry, and the benefit rate that applied to that service.
The risks of participating in these multiemployer plans are different from single-employer plans in the following aspects:
•	Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers.
•	If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.
•	If we choose to stop participating in some of the multiemployer plans, we may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability.
As of December 31, 2014, these plans covered approximately 1,200 of our employees.
Our contributions were:
•	$4 million in 2014,
•	$4 million in 2013 and
•	$4 million in 2012.
There have been no significant changes that affect the comparability of the 2014, 2013 and 2012 contributions. None of our contributions exceeded more than 5 percent of any plan's total contributions during 2014, 2013 or 2012.
DEFINED CONTRIBUTION PLANS
We sponsor various defined contribution plans for our U.S. and Canadian salaried and hourly employees. Our contributions to these plans were:
•	$20 million in 2014,
•	$20 million in 2013 and
•	$19 million in 2012.

VARIABLE_INTEREST_ENTITIES

VARIABLE INTEREST ENTITIES	12 Months Ended
	Dec. 31, 2014
VARIABLE INTEREST ENTITIES [Abstract]
VARIABLE INTEREST ENTITIES	VARIABLE INTEREST ENTITIES
	This note provides details about special-purpose entities (SPEs).
	SPECIAL-PURPOSE ENTITIES
	From 2002 through 2004, we sold certain nonstrategic timberlands in five separate transactions. We are the primary beneficiary and consolidate the assets and liabilities of certain monetization and buyer-sponsored SPEs involved in these transactions. We have an equity interest in the monetization SPEs, but no ownership interest in the buyer-sponsored SPEs. The following disclosures refer to assets of buyer-sponsored SPEs and liabilities of monetization SPEs. However, because these SPEs are distinct legal entities:
	•	Assets of the SPEs are not available to satisfy our liabilities or obligations.
	•	Liabilities of the SPEs are not our liabilities or obligations.
	In 2013, we repaid a $162 million note and received $184 million related to one of our timber monetization SPEs undertaken in 2003. Net proceeds were $22 million. In 2012, we repaid a $97 million note and received $110 million related to one of our timber monetization SPEs undertaken in 2002. Net proceeds were $13 million.
	Our Consolidated Statement of Operations includes:
	•	Interest expense on SPE notes of:
	– $29 million in 2014,
	– $29 million in 2013 and
	– $32 million in 2012.
	•	Interest income on SPE investments of:
	– $34 million in 2014,
	– $34 million in 2013 and
	– $34 million in 2012.
	Sales proceeds paid to buyer-sponsored SPEs were invested in restricted financial investments with a balance of $615 million as of both December 31, 2014, and December 31, 2013. The weighted average interest rate was 5.5 percent during 2014 and 5.1 percent during 2013. Maturities of the financial investments at the end of 2014 were:
	•	$253 million in 2019 and
	•	$362 million in 2020.
	The long-term notes of our monetization SPEs were $511 million as of both December 31, 2014, and December 31, 2013. The weighted average interest rate was 5.6 percent during 2014 and 5.3 percent in 2013. Maturities of the notes at the end of 2014 were:
	•	$209 million in 2019 and
	•	$302 million in 2020.
	Financial investments consist of bank guarantees backed by bank notes for three of the SPE transactions. Interest earned from each financial investment is used to pay interest accrued on the corresponding SPE’s note. Any shortfall between interest earned and interest accrued reduces our equity in the monetization SPEs.
	Upon dissolution of the SPEs and payment of all obligations of the entities, we would receive any net equity remaining in the monetization SPEs and would be required to report deferred tax gains on our income tax return. In the event that proceeds from the financial investments are insufficient to settle all of the liabilities of the SPEs, we are not obligated to contribute any funds to any of the SPEs. As of December 31, 2014, our net equity in the three SPEs was approximately $105 million and the deferred tax liability was estimated to be approximately $180 million.

ACCRUED_LIABILITIES

ACCRUED LIABILITIES	12 Months Ended
	Dec. 31, 2014
ACCRUED LIABILITIES
	ACCRUED LIABILITIES
	Accrued liabilities were comprised of the following:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	Wages, salaries and severance pay	$	161	$	159
	Pension and postretirement	47		57
	Vacation pay	47		48
	Income taxes	4		4
	Taxes – Social Security and real and personal property	24		32
	Interest	105		104
	Customer rebates and volume discounts	46		50
	Deferred income	75		82
	Other	78		93
	Total	$	587	$	629

LINES_OF_CREDIT

LINES OF CREDIT	12 Months Ended
	Dec. 31, 2014
Line of Credit Facility [Line Items]
LINES OF CREDIT	LINES OF CREDIT
	This note provides details about our:
	•	lines of credit and
	•	other letters of credit and surety bonds.
	OUR LINES OF CREDIT
	During September 2013, we entered into a new $1 billion 5-year senior unsecured revolving credit facility that expires in September 2018. This replaces a $1 billion revolving credit facility that was set to expire June 2015. As of June 16, 2014, WRECO terminated its participation as a borrower in the facility.
	Borrowings are at LIBOR plus a spread or at other interest rates mutually agreed upon between the borrower and the lending banks. As of December 31, 2014, there were no borrowings outstanding under the facility and we were in compliance with the credit facility covenants.
	OTHER LETTERS OF CREDIT AND SURETY BONDS
	The amounts of other letters of credit and surety bonds we have entered into as of the end of our last two years are included in the following table:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	Letters of credit	$	44	$	39
	Surety bonds	$	231	$	169
	Our compensating balance requirements for our letters of credit were $14 million as of December 31, 2014.

LONGTERM_DEBT

LONG-TERM DEBT	12 Months Ended
	Dec. 31, 2014
Long-term Debt, by Current and Noncurrent [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT
	This note provides details about:
	•	long-term debt and the portion due within one year and
	•	long-term debt maturities.
	Our long-term debt includes notes, debentures, revenue bonds and other borrowings. The following table lists our long-term debt, which includes Weyerhaeuser Company debt, by types and interest rates at the end of our last two years and includes the current portion.
	Long-Term Debt by Types and Interest Rates (Includes Current Portion)
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	6.95% debentures due 2017	$	281		$	281
	7.00% debentures due 2018	62			62
	7.375% notes due 2019	500			500
	Variable rate term loan credit facility due 2020	550			550
	9.00% debentures due 2021	150			150
	7.125% debentures due 2023	191			191
	4.625% notes due 2023	500			500
	8.50% debentures due 2025	300			300
	7.95% debentures due 2025	136			136
	7.70% debentures due 2026	150			150
	7.35% debentures due 2026	62			62
	7.85% debentures due 2026	100			100
	6.95% debentures due 2027	300			300
	7.375% debentures due 2032	1,250			1,250
	6.875% debentures due 2033	275			275
	Industrial revenue bonds, rates from 6.7% to 6.8%, due 2022	88			88
	Other	1			1
		4,896			4,896
	Less unamortized discounts	(5		)	(5		)
	Total	$	4,891		$	4,891
	Portion due within one year	$	—		$	—
	In order to repay the debt that we assumed in the acquisition of Longview Timber, in 2013 we issued $500 million of 4.625 percent notes due September 15, 2023. The net proceeds after deducting the discount, underwriting fees and issuance costs were $495 million. We also entered into a $550 million 7-year senior unsecured term loan credit facility maturing in September 2020 and borrowed $550 million. Borrowings are at LIBOR plus a spread or at other interest rates mutually agreed upon between the borrower and the lending banks.
	On October 15, 2013, we repaid the $1,118 million carrying value of the debt that we assumed in the acquisition of Longview Timber and related fees, expenses and premiums using the proceeds from the notes issued and the borrowings from our term loan credit facility borrowed in 2013. A pretax charge of $25 million was included in our net interest expense in 2013, for early retirement premiums, unamortized debt issuance costs and other miscellaneous charges in connection with the early extinguishment of debt. See Note 4: Longview Timber Purchase for more information.
	In addition to the Longview Timber debt and repaying debt that was scheduled to mature, we repaid approximately $40 million of long-term debt in 2013.
	Amounts of Long-Term Debt Due Annually for the Next Five Years and the Total Amount Due After 2019
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31, 2014
	Long-term debt maturities:
	2015	$	—
	2016	$	—
	2017	$	281
	2018	$	62
	2019	$	500
	Thereafter	$	4,053

FAIR_VALUE_OF_FINANCIAL_INSTRU

FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FAIR VALUE OF FINANCIAL INSTRUMENTS	FAIR VALUE OF FINANCIAL INSTRUMENTS
	This note provides information about the fair value of our:
	•	debt and
	•	other financial instruments.
	FAIR VALUE OF DEBT
	The estimated fair values and carrying values of our long-term debt consisted of the following:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31, 2014				DECEMBER 31, 2013
		CARRYING		FAIR VALUE		CARRYING		FAIR VALUE
		VALUE		(LEVEL 2)		VALUE		(LEVEL 2)
	Long-term debt (including current maturities)	$	4,891	$	5,922	$	4,891	$	5,683
	To estimate the fair value of long-term debt, we used the following valuation approaches:
	•	market approach — based on quoted market prices we received for the same types and issues of our debt; or
	•	income approach — based on the discounted value of the future cash flows using market yields for the same type and comparable issues of debt.
	The inputs to these valuations are based on market data obtained from independent sources or information derived principally from observable market data.
	The difference between the fair value and the carrying value represents the theoretical net premium or discount we would pay or receive to retire all debt at the measurement date.
	FAIR VALUE OF OTHER FINANCIAL INSTRUMENTS
	We believe that our other financial instruments, including cash and cash equivalents, short-term investments, receivables, and payables, have net carrying values that approximate their fair values with only insignificant differences. This is primarily due to:
	•	the short-term nature of these instruments,
	•	carrying short-term investments at expected net realizable value and
	•	the allowance for doubtful accounts.

LEGAL_PROCEEDINGS_COMMITMENTS_

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2014
LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES	LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES
	This note provides details about our:
	•	legal proceedings,
	•	environmental matters and
	•	commitments and other contingencies.
	LEGAL PROCEEDINGS
	We are party to various legal proceedings arising in the ordinary course of business. We are not currently a party to any legal proceeding that management believes could have a material adverse effect on our long-term consolidated financial position, results of operations or cash flows.
	ENVIRONMENTAL MATTERS
	Our environmental matters include:
	•	site remediation and
	•	asset retirement obligations.
	Site Remediation
	Under the Comprehensive Environmental Response, Compensation and Liability Act — commonly known as the Superfund — and similar state laws, we:
	•	are a party to various proceedings related to the cleanup of hazardous waste sites and
	•	have been notified that we may be a potentially responsible party related to the cleanup of other hazardous waste sites for which proceedings have not yet been initiated.
	Our established reserves. We have established reserves for estimated remediation costs on the active Superfund sites and other sites for which we are responsible. These reserves are recorded in "Accrued liabilities" and "Other liabilities" in our Consolidated Balance Sheet.
	Changes in the Reserve for Environmental Remediation
	DOLLAR AMOUNTS IN MILLIONS
	Reserve balance as of December 31, 2013	$	30
	Reserve charges and adjustments, net	4
	Payments	(5		)
	Reserve balance as of December 31, 2014	$	29
	Total active sites as of December 31, 2014	49
	We change our accrual to reflect:
	•	new information on any site concerning implementation of remediation alternatives,
	•	updates on prior cost estimates and new sites and
	•	costs incurred to remediate sites.
	Estimates. We believe it is reasonably possible, based on currently available information and analysis, that remediation costs for all identified sites may exceed our existing reserves by up to $108 million.
	This estimate, in which those additional costs may be incurred over several years, is the upper end of the range of reasonably possible additional costs. The estimate:
	•	is much less certain than the estimates on which our accruals currently are based, and
	•	uses assumptions that are less favorable to us among the range of reasonably possible outcomes.
	In estimating our current accruals and the possible range of additional future costs, we:
	•	assumed we will not bear the entire cost of remediation of every site,
	•	took into account the ability of other potentially responsible parties to participate, and
	•	considered each party’s financial condition and probable contribution on a per-site basis.
	We have not recorded any amounts for potential recoveries from insurance carriers.
	Asset Retirement Obligations
	We have obligations associated with the retirement of tangible long-lived assets consisting primarily of reforestation obligations related to forest management licenses in Canada and obligations to close and cap landfills. Some of our sites have asbestos containing materials. We have met our current legal obligation to identify and manage these materials. In situations where we cannot reasonably determine when asbestos containing materials might be removed from the sites, we have not recorded an accrual because the fair value of the obligation cannot be reasonably estimated. These obligations are recorded in "Accrued liabilities" and "Other liabilities" in our Consolidated Balance Sheet.
	Changes in the Reserve for Asset Retirement Obligations
	DOLLAR AMOUNTS IN MILLIONS
	Reserve balance as of December 31, 2013	$	54
	Reserve charges and adjustments, net	10
	Payments	(10		)
	Other adjustments(1)	(14		)
	Reserve balance as of December 31, 2014	$	40
	(1) Primarily related to the sale of a landfill in Washington State.
	COMMITMENTS AND OTHER CONTINGENCIES
	Our commitments and contingencies include:
	•	guarantees of debt and performance,
	•	purchase obligations for goods and services and
	•	operating leases.
	Guarantees
	We have guaranteed the performance of the buyer/lessee of a timberlands lease we sold in 2005. Future payments on the lease — which expires in 2023 — are $16 million.
	Purchase Obligations
	Our purchase obligations as of December 31, 2014 were:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31, 2014
	2015	$	35
	2016	$	16
	2017	$	6
	2018	$	6
	2019	$	2
	Thereafter	$	7
	Purchase obligations for goods or services are agreements that:
•	are enforceable and legally binding,
•	specify all significant terms and
•	cannot be canceled without penalty.
The terms include:
•	fixed or minimum quantities to be purchased,
•	fixed, minimum or variable price provisions, and
•	an approximate timing for the transaction.
Our purchase obligations include items such as:
•	stumpage and log purchases,
•	energy and
•	other service and supply contracts.
Operating Leases
Our rent expense was:
DOLLAR AMOUNTS IN MILLIONS
	2014			2013		2012
Rent expense	$	32		$	38	$	36
We have operating leases for:
•	various equipment, including logging equipment, lift trucks, automobiles and office equipment; and
•	office and wholesale space.
Commitments
Our operating lease commitments as of December 31, 2014 were:
DOLLAR AMOUNTS IN MILLIONS
	DECEMBER 31, 2014
2015	$	28
2016	$	21
2017	$	20
2018	$	16
2019	$	12
Thereafter	$	107

SHAREHOLDERS_INTEREST

SHAREHOLDERS' INTEREST	12 Months Ended
	Dec. 31, 2014
SHAREHOLDERS' INTEREST	SHAREHOLDERS’ INTEREST
	This note provides details about:
	•	preferred and preference shares,
	•	common shares,
	•	share-repurchase programs and
	•	cumulative other comprehensive income (loss).
	PREFERRED AND PREFERENCE SHARES
	We had no preferred shares outstanding at the end of 2014 or 2013. However, we have authorization to issue 7 million preferred shares with a par value of $1 per share.
	As part of our purchase of Longview Timber, we issued 13.8 million of our 6.375 percent Mandatory Convertible Preference Shares, Series A, par value $1.00 and liquidation preference of $50.00 per share on June 24, 2013, for net proceeds of $669 million, which remained outstanding at year-end 2014. Dividends will be payable on a cumulative basis when, as and if declared by our Board of Directors, at an annual rate of 6.375 percent on the liquidation preference. We may pay declared dividends in cash or, subject to certain limitations, in common shares or by delivery of any combination of cash and common shares on January 1, April 1, July 1 and October 1 of each year, commencing on October 1, 2013, through, and including, July 1, 2016. These shares will automatically convert on July 1, 2016 into between 1.5090 and 1.8107 of our common shares, subject to anti-dilution adjustments. At any time prior to that date, holders may elect to convert each share into common shares at the minimum conversion rate of 1.5090 common shares, subject to anti-dilution adjustments. See Note 4: Longview Timber Purchase for more information.
	We may issue preferred or preference shares at one time or through a series of offerings. The shares may have varying rights and preferences that can include:
	•	dividend rates,
	•	redemption rights,
	•	conversion terms,
	•	sinking-fund provisions,
	•	values in liquidation and
	•	voting rights.
	When issued, outstanding preferred and preference shares rank senior to outstanding common shares. That means preferred and preference shares would receive dividends and assets available on liquidation before any payments are made to common shares.
	COMMON SHARES
	The number of common shares we have outstanding changes when:
	•	new shares are issued,
	•	stock options are exercised,
	•	restricted stock units or performance share units vest,
	•	stock-equivalent units are paid out,
	•	shares are tendered,
	•	shares are repurchased or
	•	shares are canceled.
	Reconciliation of Our Common Share Activity
	IN THOUSANDS
		2014		2013		2012
	Outstanding at beginning of year	583,548		542,393		536,425
	New issuance (Note 4)	—		33,350		—
	Shares tendered (Note 3)	(58,813	)	—		—
	Stock options exercised	5,134		7,209		5,404
	Issued for restricted stock units	451		462		523
	Issued for performance shares	217		134		—
	Issued for Directors' stock-equivalent units	—		—		41
	Repurchased	(6,063	)	—		—
	Outstanding at end of year	524,474		583,548		542,393
	OUR SHARE REPURCHASE PROGRAMS
	On August 13, 2014, our Board of Directors approved the 2014 stock repurchase program under which we are authorized to repurchase up to $700 million of outstanding shares. The 2014 stock repurchase program replaced the prior 2011 stock repurchase program. During 2014, we repurchased 6,062,993 shares of common stock for $203 million under the 2014 stock repurchase program. All common stock purchases under the stock repurchase program were made in open-market transactions. As of December 31, 2014, we had remaining authorization of $497 million for future share repurchases.
	CUMULATIVE OTHER COMPREHENSIVE INCOME (LOSS)
	Changes in amounts included in our cumulative other comprehensive income (loss) by component are:
	DOLLAR AMOUNTS IN MILLIONS
					PENSION						OTHER POSTRETIREMENT BENEFITS
		Foreign currency translation adjustments			Actuarial losses			Prior service costs			Actuarial losses			Prior service credits			Unrealized gains on available-for-sale securities		Total
	Beginning balance as of December 31, 2012	$	413		$	(1,942	)	$	(23	)	$	(137	)	$	127		$	4	$	(1,558	)
	Other comprehensive income (loss) before reclassifications	(59		)	1,123			—			24			66			2		1,156
	Income taxes	—			(394		)	—			(7		)	(27		)	—		(428		)
	Net other comprehensive income (loss) before reclassifications	(59		)	729			—			17			39			2		728
	Amounts reclassified from cumulative other comprehensive income (loss)(1)	—			221			7			14			(23		)	—		219
	Income taxes	—			(74		)	(3		)	(5		)	7			—		(75		)
	Net amounts reclassified from cumulative other comprehensive income (loss)	—			147			4			9			(16		)	—		144
	Total other comprehensive income (loss)	(59		)	876			4			26			23			2		872
	Beginning balance as of December 31, 2013	354			(1,066		)	(19		)	(111		)	150			6		(686		)
	Other comprehensive income (loss) before reclassifications	(50		)	(1,008		)	1			(6		)	(12		)	—		(1,075		)
	Income taxes	—			369			—			1			7			—		377
	Net other comprehensive income (loss) before reclassifications	(50		)	(639		)	1			(5		)	(5		)	—		(698		)
	Amounts reclassified from cumulative other comprehensive income (loss)(1)	—			125			5			12			(161		)	—		(19		)
	Income taxes	—			(43		)	(2		)	(4		)	59			—		10
	Net amounts reclassified from cumulative other comprehensive income (loss)	—			82			3			8			(102		)	—		(9		)
	Total other comprehensive income (loss)	(50		)	(557		)	4			3			(107		)	—		(707		)
	Ending balance as of December 31, 2014	$	304		$	(1,623	)	$	(15	)	$	(108	)	$	43		$	6	$	(1,393	)
	(1) Actuarial losses and prior service credits (costs) are included in the computation of net periodic benefit costs (credits). See Note: 9 Pension and Other Postretirement Benefit Plans.

SHAREBASED_COMPENSATION

SHARE-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2014
SHARE-BASED COMPENSATION	SHARE-BASED COMPENSATION
	Share-based compensation expense was:
	•	$40 million in 2014,
	•	$42 million in 2013 and
	•	$37 million in 2012.
	The amounts above contain awards to employees that were part of the Real Estate Divestiture and are included in our results of discontinued operations. These amounts are:
	•	$3 million in 2014,
	•	$5 million in 2013 and
	•	$4 million in 2012.
	This note provides details about:
	•	our Long-Term Incentive Compensation Plan (2013 Plan),
	•	how we account for share-based awards,
	•	tax benefits of share-based awards,
	•	types of share-based compensation and
	•	unrecognized share-based compensation.
	OUR LONG-TERM INCENTIVE COMPENSATION PLAN
	Our long-term incentive plans provide for share-based awards that include:
	•	stock options,
	•	stock appreciation rights,
	•	restricted stock,
	•	restricted stock units,
	•	performance shares and
	•	performance share units.
	We may issue future grants of up to 19,466,670 shares under the 2013 Plan. We also have the right to reissue forfeited and expired grants.
	For stock options and stock appreciation rights:
	•	An individual participant may receive a grant of up to 2 million shares in any one calendar year.
	•	The exercise price is required to be the market price on the date of the grant.
	For restricted stock, restricted stock units, performance shares, performance share units or other equity grants:
	•	An individual participant may receive a grant of up to 1 million shares annually.
	•	No participant may be granted awards that exceed $10 million earned in a 12 month period.
	The Compensation Committee of our Board of Directors (the Committee) annually establishes an overall pool of stock awards available for grants based on performance.
	For stock-settled awards, we:
	•	issue new stock into the marketplace and
	•	generally do not repurchase shares in connection with issuing new awards.
	Our common shares would increase by approximately 34 million shares if all share-based awards were exercised or vested. These include:
	•	all options, restricted stock units, and performance share units outstanding at December 31, 2014 under the 2013 Plan and 2004 Plan; and
	•	all remaining options, restricted stock units, and performance share units that could be granted under the 2013 Plan.
	HOW WE ACCOUNT FOR SHARE-BASED AWARDS
	We:
	•	use a fair-value-based measurement for share-based awards, and
	•	recognize the cost of share-based awards in our consolidated financial statements.
	We recognize the cost of share-based awards in our Consolidated Statement of Operations over the required service period — generally the period from the date of the grant to the date when it is vested. Special situations include:
	•	Awards that vest upon retirement — the required service period ends on the date an employee is eligible for retirement, including early retirement.
	•	Awards that continue to vest following job elimination or the sale of a business — the required service period ends on the date the employment from the company is terminated.
	In these special situations, compensation expense from share-based awards is recognized over a period that is shorter than the stated vesting period.
	TAX BENEFITS OF SHARE-BASED AWARDS
	Our total income tax benefit from share-based awards — as recognized in our Consolidated Statement of Operations — for the last three years was:
	•	$11 million in 2014,
	•	$10 million in 2013, and
	•	$9 million in 2012.
	The amounts above contain income tax benefit from share-based awards to employees that were part of the Real Estate Divestiture and are included in our results of discontinued operations. These amounts are:
	•	$1 million in 2014,
	•	$2 million in 2013 and
	•	$1 million in 2012.
	Tax benefits for share-based awards are accrued as stock compensation expense is recognized in the Consolidated Statement of Operations. Tax benefits on share-based awards are realized when:
	•	restricted shares and restricted share units vest,
	•	performance shares and performance share units vest,
	•	stock options are exercised and
	•	stock appreciation rights are exercised.
	When actual tax benefits realized exceed the tax benefits accrued for share-based awards, we realize an excess tax benefit. We report the excess tax benefit as financing cash inflows rather than operating cash inflows. We had excess tax benefits of:
	•	$10 million in 2014,
	•	$13 million in 2013 and
	•	$5 million in 2012.
	The amounts above contain excess tax benefits from share-based awards to employees that were part of the Real Estate Divestiture and are included in our results of discontinued operations. These amounts are:
•	$2 million in 2014,
•	$2 million in 2013 and
•	$1 million in 2012.
TYPES OF SHARE-BASED COMPENSATION
Our share-based compensation is in the form of:
•	stock options,
•	restricted stock units,
•	performance share units,
•	stock appreciation rights and
•	deferred compensation stock equivalent units.
STOCK OPTIONS
Stock options entitle award recipients to purchase shares of our common stock at a fixed exercise price. We grant stock options with an exercise price equal to the market price of our stock on the date of the grant.
The Details
Our stock options generally:
•	vest over four years of continuous service and
•	must be exercised within 10 years of the grant-date.
The vesting and post-termination vesting terms for stock options granted in 2014, 2013 and 2012 were as follows:
•	vest ratably over four years;
•	vest or continue to vest in the event of death while employed, disability or retirement at an age of at least 62;
•	continue to vest upon retirement at an age of at least 62, but a portion of the grant is forfeited if retirement occurs before the one year anniversary of the grant;
•	continue to vest for one year in the event of involuntary termination when the retirement criteria has not been met; and
•	stop vesting for all other situations including early retirement prior to age 62.
Our Accounting
We use a Black-Scholes option valuation model to estimate the fair value of every stock option award on its grant-date.
In our estimates, we use:
•	historical data — for option exercise time and employee terminations;
•	a Monte-Carlo simulation — for how long we expect granted options to be outstanding; and
•	the U.S. Treasury yield curve — for the risk-free rate. We use a yield curve over a period matching the expected term of the grant.
The expected volatility in our valuation model is based on:
•	implied volatilities from traded options on our stock,
•	historical volatility of our stock and
•	other factors.
Weighted Average Assumptions Used in Estimating Value of Stock Options Granted
	2014			2013			2012
	GRANTS			GRANTS			GRANTS
Expected volatility	31.71		%	38		%	40.41		%
Expected dividends	2.92		%	2.23		%	2.94		%
Expected term (in years)	4.97			4.97			5.33
Risk-free rate	1.57		%	0.92		%	1.01		%
Weighted average grant-date fair value	$	6.62		$	8.4		$	5.72
Share-based compensation expense for stock options is generally recognized over the vesting period. There are exceptions for stock options awarded to employees who:
•	are eligible for retirement;
•	will become eligible for retirement during the vesting period; or
•	whose employment is terminated during the vesting period due to job elimination or the sale of a business.
In these cases, we record the share-based compensation expense over a required service period that is less than the stated vesting period.
Activity
The following table shows our option unit activity for 2014.
	OPTIONS	WEIGHTED			WEIGHTED	AGGREGATE
	(IN	AVERAGE			AVERAGE	INTRINSIC
	THOUSANDS)	EXERCISE			REMAINING	VALUE (IN
		PRICE			CONTRACTUAL	MILLIONS)
					TERM
					(IN YEARS)
Outstanding at December 31, 2013	17,055	$	23.12
Granted	2,463	$	30.14
Exercised	-5,294	$	22.5
Forfeited or expired(1)	-1,939	$	26.98
Outstanding at December 31, 2014(2)	12,285	$	24.19		5.27	$	144
Exercisable at December 31, 2014	8,267	$	22.32		3.81	$	112
(1) Approximately 1,601 thousand stock options were cancelled as a result of the Real Estate Divestiture. See Note 3: Discontinued Operations for more information.
(2) As of December 31, 2014, there were approximately 998 thousand stock options that had met the requisite service period and will be released as identified in the grant terms.
The total intrinsic value of stock options exercised was:
•	$55 million in 2014,
•	$61 million in 2013 and
•	$28 million in 2012.
The total grant-date fair value of stock options vested was:
•	$16 million in 2014,
•	$14 million in 2013 and
•	$15 million in 2012.
RESTRICTED STOCK UNITS
Through the Plan, we award restricted stock units — grants that entitle the holder to shares of our stock as the award vests.
The Details
Our restricted stock units granted in 2014, 2013 and 2012 generally:
•	vest ratably over four years;
•	immediately vest in the event of death while employed or disability;
•	continue to vest upon retirement at an age of at least 62, but a portion of the grant is forfeited if retirement occurs before the one year anniversary of the grant;
•	continue vesting for one year in the event of involuntary termination when the retirement has not been met; and
•	will be forfeited upon termination of employment in all other situations including early retirement prior to age 62.
Our Accounting
The fair value of our restricted stock units is the market price of our stock on the grant-date of the awards.
We generally record share-based compensation expense for restricted stock units over the four-year vesting period. Generally for restricted stock units that continue to vest following the termination of employment, we record the share-based compensation expense over a required service period that is less than the stated vesting period.
Activity
The following table shows our restricted stock unit activity for 2014.
	STOCK UNITS	WEIGHTED
	(IN THOUSANDS)	AVERAGE
		GRANT-DATE
		FAIR VALUE
Nonvested at December 31, 2013	1,547	$	25.83
Granted	686	$	30.14
Vested	-628	$	24.94
Forfeited(1)	-378	$	27.9
Nonvested at December 31, 2014(2)	1,227	$	28.06
(1) Approximately 280 thousand restricted stock units were cancelled as a result of the Real Estate Divestiture. See Note 3: Discontinued Operations for more information.
(2) As of December 31, 2014, there were approximately 212 thousand restricted stock units that had met the requisite service period and will be released as identified in the grant terms.
The weighted average grant-date fair value for restricted stock units was:
•	$30.54 in 2013 and
•	$20.42 in 2012.
The total grant-date fair value of restricted stock units vested was:
•	$16 million in 2014,
•	$14 million in 2013 and
•	$19 million in 2012.
Nonvested restricted stock units accrue dividends that are paid out when restricted stock units vest. Any restricted stock units forfeited will not receive dividends.
As restricted stock units vest, a portion of the shares awarded is withheld to cover employee taxes. As a result, the number of stock units vested and the number of common shares issued will differ.
PERFORMANCE SHARE UNITS
As part of a new long-term incentive compensation strategy intended to tie executive compensation more closely to company performance, we granted a target number of performance share units to executives in 2014, 2013, 2012 and 2011. Performance share units will be paid in the form of shares of Weyerhaeuser stock – to the extent earned through company performance against financial goals – over a four-year vesting period.
The Details
The final number of shares awarded will range from 0 percent to 150 percent of each grant’s target, depending upon actual company performance.
The ultimate number of performance share units earned is based on two measures:
•	Weyerhaeuser’s cash flow during the first year determined the initial number of units earned and
•	Weyerhaeuser’s relative total shareholder return (TSR) ranking in the S&P 500 during the first two years is used to adjust the initial number of units earned up or down by 20 percent.
At the end of the two-year performance period and over a further two-year vesting period, performance share units would be paid in shares of our stock. Performance share units granted and that are earned vest as follows:
•	vest 50 percent, 25 percent and 25 percent on the second, third and fourth anniversaries of the grant-date, respectively, as long as the individual remains employed by the company;
•	fully vest in the event the participant dies or becomes disabled while employed;
•	continue to vest upon retirement at an age of at least 62, but a portion of the grant is forfeited if retirement occurs before the one year anniversary of the grant;
•	continue vesting for one year in the event of involuntary termination when the retirement has not been met; and
•	will be forfeited upon termination of employment in all other situations including early retirement prior to age 62.
Our Accounting
Since the award contains a market condition, the effect of the market condition is reflected in the grant-date fair value which is estimated using a Monte Carlo simulation model. This model estimates the TSR ranking of the company among the S&P 500 index over the two-year performance period. Compensation expense is based on the estimated probable number of earned awards and recognized over the four-year vesting period on an accelerated basis. Generally, compensation expense would be reversed if the performance condition is not met unless the requisite service period has been achieved.
Weighted Average Assumptions Used in Estimating the Value of Performance Share Units
	2014			2013			2012
	GRANTS			GRANTS			GRANTS
Performance period	1/1/2014 – 12/31/2015			1/1/2013 – 12/31/2014			1/1/2012 – 12/31/2013
Valuation date closing stock price	$	30.16		$	30.48		$	20.56
Expected dividends	2.91		%	2.23		%	2.92		%
Risk-free rate	0.03% - 0.79%			0.09% - 0.46%			0.08% - 0.32%
Volatility	20.74% - 23.53%			22.09% - 29.57%			34.66% - 34.86%
Weighted average grant-date fair value	$	30.62		$	31.59		$	21.71
Activity
The following table shows our performance share unit activity for 2014.
	GRANTS (IN		WEIGHTED
	THOUSANDS)		AVERAGE
			GRANT-DATE
			FAIR VALUE
Nonvested at December 31, 2013	1,102		$	26.83
Granted at target	321		$	30.62
Vested	(311	)	$	23.32
Forfeited(1)	(206	)	$	26.07
Performance adjustment	(16	)	$	31.15
Nonvested at December 31, 2014(2)	890		$	29.46
(1) Approximately 44 thousand performance share units were cancelled as a result of the Real Estate Divestiture. See Note 3: Discontinued Operations for more information.
(2) As of December 31, 2014, there were approximately 393 thousand performance share units that had met the requisite service period and will be released as identified in the grant terms.
The total grant-date fair value of performance share units vested was:
•	$7 million in 2014 and
•	$5 million in 2013.
There were no performance share units vesting in 2012.
For 2014 grants, the company exceeded the cash flow target, resulting in an initial number of shares earned equal to 114 percent of target.
For 2013 grants, the company exceeded the cash flow target, resulting in an initial number of shares earned equal to 150 percent of target. Because the company's two-year TSR ranking was between the 25th and 50th percentile, the initial number of performance shares granted decreased 15 percent.
For 2012 grants, the company exceeded the cash flow target, resulting in an initial number of shares earned equal to 122 percent of target. Because the company's two-year TSR ranking was between the 50th and 75th percentile, the initial number of performance shares granted increased 17 percent.
As performance share units vest, a portion of the shares awarded is withheld to cover participant taxes. As a result, the number of stock units vested and the number of common shares issued will differ.
STOCK APPRECIATION RIGHTS
Through the Plan, we grant cash-settled stock appreciation rights as part of certain compensation awards.
The Details
Stock appreciation rights are similar to stock options. Employees benefit when the market price of our stock is higher on the exercise date than it was on the date the stock appreciation rights were granted. The differences are that the employee:
•	receives the benefit as a cash award and
•	does not purchase the underlying stock.
The vesting conditions and exceptions are the same as for 10-year stock options. Details are in the Stock Options section earlier in this note.
Stock appreciation rights are generally issued to employees outside of the U.S.
Our Accounting
We use a Black-Scholes option-valuation model to estimate the fair value of a stock appreciation right on its grant-date and every subsequent reporting date that the right is outstanding. Stock appreciation rights are liability-classified awards and the fair value is remeasured at every reporting date.
The process used to develop our valuation assumptions is the same as for the 10-year stock options we grant. Details are in the Stock Options section earlier in this note.
Weighted Average Assumptions Used to Re-measure Value of Stock Appreciation Rights at Year-End
	2014			2013			2012
	GRANTS			GRANTS			GRANTS
Expected volatility	18.2		%	24.02		%	29.07		%
Expected dividends	3.21		%	2.81		%	2.44		%
Expected term (in years)	1.32			1.16			1.71
Risk-free rate	0.45		%	0.19		%	0.27		%
Weighted average fair value	$	12.7		$	8.68		$	7.25
Activity
The following table shows our stock appreciation rights activity for 2014.
	RIGHTS		WEIGHTED			AVERAGE	AGGREGATE
	(IN		AVERAGE			REMAINING	INTRINSIC
	THOUSANDS)		EXERCISE			CONTRACTUAL	VALUE (IN
			PRICE			TERM	MILLIONS)
						(IN YEARS)
Outstanding at December 31, 2013	695		$	22.96
Granted	74		$	30.16
Exercised	(322	)	$	24.21
Forfeited or expired	(30	)	$	28.8
Outstanding at December 31, 2014	417		$	22.85		4.44	$	5
Exercisable at December 31, 2014	327		$	21.7		3.39	$	5
The total liabilities paid for stock appreciation rights was:
•	$2 million in 2014,
•	$4 million in 2013 and
•	$1 million in 2012.
UNRECOGNIZED SHARE-BASED COMPENSATION
As of December 31, 2014, our unrecognized share-based compensation cost for all types of share-based awards included:
•	$39 million related to non-vested equity-classified share-based compensation arrangements — expected to be recognized over a weighted average period of approximately 2.3 years; and
•	$1 million related to non-vested liability-classified stock appreciation rights — expected to vest over a weighted average period of approximately 2.3 years.
DEFERRED COMPENSATION STOCK EQUIVALENT UNITS
Certain employees and our board of directors may defer compensation into stock-equivalent units.
The Details
The plan works differently for employees and directors.
Eligible employees:
•	may choose to defer all or part of their bonus into stock-equivalent units;
•	may choose to defer part of their salary, except for executive officers; and
•	receive a 15 percent premium if the deferral is for at least five years.
Our directors:
•	receive a portion of their annual retainer fee in the form of restricted stock units, which vest over one year and may be deferred into stock-equivalent units;
•	may choose to defer some or all of the remainder of their annual retainer fee into stock-equivalent units; and
•	do not receive a premium for their deferrals.
Employees and directors also choose when the deferrals will be paid out although no deferrals may be paid until after the separation from service of the employee or director.
Our Accounting
We settle all deferred compensation accounts in cash for our employees. Our directors receive shares of common stock as payment for stock-equivalent units. In addition, we credit all stock-equivalent accounts with dividend equivalents.
During 2012, the directors' deferred compensation plan was amended to allow the directors to elect to receive payments of amounts deferred into stock-equivalent units in cash or stock for elections made prior to December 31, 2011. Deferrals made beginning January 1, 2012, into stock-equivalent units will be paid in common shares. Elections to receive these deferred amounts in stock resulted in the issuance of 71,056 in 2014, 52,720 in 2013 and 40,899 shares in 2012. The number of common shares to be issued in the future to directors who elected common share payments is 605,987.
Stock-equivalent units are:
•	liability-classified awards and
•	re-measured to fair value at every reporting date.
The fair value of a stock-equivalent unit is equal to the market price of our stock.
Activity
The number of stock-equivalent units outstanding in our deferred compensation accounts was:
•	944,966 as of December 31, 2014;
•	915,160 as of December 31, 2013; and
•	971,650 as of December 31, 2012.

CHARGES_FOR_RESTRUCTURING_CLOS

CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS	12 Months Ended
	Dec. 31, 2014
CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS	CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS
	Items Included in Our Restructuring, Closure and Asset Impairment Charges
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013		2012
	Restructuring and closure charges:
	Termination benefits	$	27		$	1	$	—
	Pension and postretirement charges	3			—		—
	Other restructuring and closure costs	12			4		6
	Charges for restructuring and closures	42			5		6
	Impairment of long-lived assets	2			372		20
	Total charges for restructuring, closures and impairments	$	44		$	377	$	26
	RESTRUCTURING AND CLOSURES
	During 2014, our restructuring and closure charges were primarily related to our selling, general and administrative cost reduction initiative to support achieving our competitive performance goals. We do not expect additional material charges related to this initiative in 2015. During 2013 and 2012, our restructuring and closure charges were primarily related to various Wood Products operations we closed or curtailed and restructuring our corporate staff functions to support achieving our competitive performance goals.
	Other restructuring and closure costs include lease termination charges, dismantling and demolition of plant and equipment, gain or loss on disposition of assets, environmental cleanup costs and incremental costs to wind down operating facilities.
	ACCRUED TERMINATION BENEFITS
	Changes in accrued severance related to restructuring during 2014 were as follows:
	DOLLAR AMOUNTS IN MILLIONS
	Accrued severance as of December 31, 2013	$	2
	Charges	27
	Payments	(19		)
	Accrued severance as of December 31, 2014	$	10
	ASSET IMPAIRMENTS
	The Impairment of Long-Lived Assets and Goodwill sections of Note 1: Summary of Significant Accounting Policies provide details about how we account for these impairments. Additional information can also be found in our Critical Accounting Policies.
	Long-Lived Assets
	Our long-lived asset impairments were primarily related to the following:
	•	2013 — charges include:
	– $356 million impairment of the Coyote Springs Property. Under the terms of the TRI Pointe transaction, certain assets and liabilities of WRECO and its subsidiaries were excluded from the transaction and retained by Weyerhaeuser, including assets and liabilities relating to the Coyote Springs Property. During fourth quarter 2013, following the announcement of the TRI Pointe transaction, WRECO and Weyerhaeuser began exploring strategic alternatives for the Coyote Springs Property and determined that Weyerhaeuser’s strategy for development of the Coyote Springs Property will likely differ from WRECO’s current development plan. WRECO’s development plan was long-term in nature with development and net cash flows covering at least 15-20 years. The undiscounted cash flows for the Coyote Springs Property under the WRECO development plan remained above the carrying value of the property. Weyerhaeuser Company’s strategy is to cease holding the Coyote Springs Property for development and to initiate activities in the near-term to market the assets to potential third-party buyers. The undiscounted cash flows under the Weyerhaeuser Company asset sale strategy were below the carrying value of the property. Consequently, we recorded a noncash charge of $356 million in fourth quarter 2013 for the impairment of the Coyote Springs Property in Unallocated Items. The fair value of the property was primarily based on an independent appraisal that was determined using both other observable inputs (Level 2) related to other market transactions and significant unobservable inputs (Level 3) such as the timing and amounts of future cash flows related to the development of the property, timing and amounts of proceeds from acreage sales, access to water for use on the property and discount rates applicable to the future cash flows. The property is recorded in "Property and equipment, net" and "Other assets" in our Consolidated Balance Sheet.
	– $9 million related to the decision to permanently close our Colbert, Georgia engineered wood products facility in our Wood Products segment that was previously indefinitely closed. The fair value of the facility was determined using significant unobservable inputs (Level 3) based on liquidation values.
	•	2012 — charges are primarily related to unutilized assets held in Unallocated Items that were sold or are currently held for sale. The fair values of the assets were determined using significant other observable inputs (Level 2) based on market quotes and significant unobservable inputs (Level 3) based on discounted cash flow models.

OTHER_OPERATING_INCOME_NET

OTHER OPERATING INCOME, NET	12 Months Ended
	Dec. 31, 2014
OTHER OPERATING INCOME, NET	OTHER OPERATING INCOME, NET
	Other operating income, net:
	•	includes both recurring and occasional income and expense items and
	•	can fluctuate from year to year.
	Various Income and Expense Items Included in Other Operating Income, Net
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Gain on postretirement plan amendment (Note 9)	$	(151	)	$	—		$	(103	)
	Gain on disposition of non-strategic assets	(27		)	(19		)	(28		)
	Foreign exchange (gains) losses, net	27			7			(6		)
	Land management income	(34		)	(28		)	(27		)
	Litigation expense, net	9			16			12
	Other, net	(25		)	(11		)	(26		)
	Total	$	(201	)	$	(35	)	$	(178	)
	Gain on disposition of non-strategic assets in 2014 included a $22 million pretax gain on the sale of a landfill in Washington State.
	Foreign exchange (gains) losses result from changes in exchange rates primarily related to our U.S. dollar denominated debt that is held by our Canadian subsidiary.
	Land management income includes income from recreational activities, land permits, grazing rights, firewood sales and other miscellaneous income related to land management activities.

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2014
INCOME TAXES	INCOME TAXES
	This note provides details about our income taxes applicable to continuing operations:
	•	earnings before income taxes,
	•	provision for income taxes,
	•	effective income tax rate,
	•	deferred tax assets and liabilities and
	•	unrecognized tax benefits.
	Income taxes related to discontinued operations are discussed in Note 3: Discontinued Operations.
	EARNINGS BEFORE INCOME TAXES
	Domestic and Foreign Earnings (Loss) From Continuing Operations Before Income Taxes
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Domestic earnings	$	970		$	198		$	333
	Foreign earnings (loss)	43			122			(11		)
	Total	$	1,013		$	320		$	322
	PROVISION FOR INCOME TAXES
	Provision (Benefit) for Income Taxes From Continuing Operations
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Current:
	Federal	$	(26	)	$	(80	)	$	(78	)
	State	12			(18		)	(11		)
	Foreign	3			(21		)	26
		(11		)	(119		)	(63		)
	Deferred:
	Federal	178			(79		)	6
	State	6			6			1
	Foreign	12			21			66
		196			(52		)	73
	Total income tax provision (benefit)	$	185		$	(171	)	$	10
	Included in our income tax provision for 2012 are recomputations of prior year taxes, resulting in reclassifications between foreign and domestic for both current and deferred taxes as a result of final tax proceedings between countries.
	EFFECTIVE INCOME TAX RATE
	Effective Income Tax Rate Applicable to Continuing Operations
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	U.S. federal statutory income tax	$	354		$	112		$	113
	State income taxes, net of federal tax benefit	14			7			3
	REIT income not subject to federal income tax	(161		)	(101		)	(94		)
	Foreign taxes	(2		)	(8		)	8
	Provision for unrecognized tax benefits	(4		)	(193		)	(6		)
	Repatriation of Canadian earnings	—			21			—
	State income tax settlement	—			—			(10		)
	Domestic production activities deduction	—			(13		)	—
	Other, net	(16		)	4			(4		)
	Total income tax provision (benefit)	$	185		$	(171	)	$	10
	Effective income tax rate	18.3		%	(53.4		)%	3.1		%
	DEFERRED TAX ASSETS AND LIABILITIES
	Deferred tax assets and liabilities reflect temporary differences between pretax book income and taxable income. Deferred tax assets represent tax benefits that have already been recorded for book purposes but will be recorded for tax purposes in the future. Deferred tax liabilities represent income that has been recorded for book purposes but will be reported as taxable income in the future.
	Balance Sheet Classification of Deferred Income Tax Assets (Liabilities) Related to Continuing Operations
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Net current deferred tax asset	$	228		$	130
	Net noncurrent deferred tax asset	8			5
	Net noncurrent deferred tax liability	(206		)	(285		)
	Net deferred tax asset (liability)	$	30		$	(150	)
	Items Included in Our Deferred Income Tax Assets (Liabilities)
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Postretirement benefits	$	101		$	102
	Pension	369			57
	Real estate impairments	—			121
	State tax credits	56			59
Net operating loss carryforwards	86			110
Cellulosic biofuel producers credit	100			80
Other	223			260
Gross deferred tax assets	935			789
Valuation allowance	(72		)	(89		)
Net deferred tax assets	863			700
Property, plant and equipment	(523		)	(540		)
Timber installment notes	(180		)	(180		)
Other	(130		)	(130		)
Deferred tax liabilities	(833		)	(850		)
Net deferred tax asset (liability)	$	30		$	(150	)
OTHER INFORMATION ABOUT OUR DEFERRED INCOME TAX ASSETS (LIABILITIES)
Other information about our deferred income tax assets (liabilities) include:
•	net operating loss and credit carryforwards,
•	valuation allowances and
•	reinvestment of undistributed earnings.
Net Operating Loss and Credit Carryforwards
Our state and foreign net operating loss carryforwards as of the end of 2014 are as follows:
•	$586 million, which expire from 2015 through 2034; and
•	$1 million, which do not expire.
Our federal, state and foreign credit carryforwards as of the end of 2014 are as follows:
•	$148 million, which expire from 2015 through 2034; and
•	$31 million, which do not expire.
Valuation Allowances
With the exception of the valuation allowance discussed below, we believe it is more likely than not that we will have sufficient future taxable income to realize our deferred tax assets.
Our valuation allowance on our deferred tax assets was $72 million as of the end of 2014. This primarily related to foreign and state net operating losses and state and provincial credits.
The total changes in our valuation allowance over the last year was a net decrease of $17 million. This net decrease resulted primarily from the disposition of foreign entities with net operating losses and the expiration of foreign and state net operating losses and credits.
Reinvestment of Undistributed Earnings
The balance of our foreign undistributed earnings was approximately $27 million at the end of 2014 and is permanently reinvested; therefore, it is not subject to U.S. income tax. Generally, such earnings become subject to U.S. tax upon the remittance of dividends and under certain other circumstances. It is not practicable to estimate the amount of deferred tax liability related to investments in our foreign subsidiaries.
HOW WE ACCOUNT FOR INCOME TAXES
The Income Taxes section of Note 1: Summary of Significant Accounting Policies provides details about how we account for our income taxes.
UNRECOGNIZED TAX BENEFITS
Unrecognized tax benefits represent potential future obligations to taxing authorities if uncertain tax positions we have taken on previously filed tax returns are not sustained. The total amount of unrecognized tax benefits as of December 31, 2014 and 2013, are $11 million and $26 million, respectively, which does not include related interest of $3 million and $4 million, respectively. These amounts represent the gross amount of exposure in individual jurisdictions and do not reflect any additional benefits expected to be realized if such positions were not sustained, such as the federal deduction that could be realized if an unrecognized state deduction was not sustained.
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits
DOLLAR AMOUNTS IN MILLIONS
	DECEMBER 31,			DECEMBER 31,
	2014			2013
Balance at beginning of year	$	26		$	177
Reductions for tax positions of prior years	—			(148		)
Lapse of statute	(15		)	(3		)
Balance at end of year	$	11		$	26
The net liability recorded in our Consolidated Balance Sheet related to unrecognized tax benefits was $4 million as of December 31, 2014, which includes interest of $3 million and is net of $6 million in payments made in advance of settlements and $4 million in credits and loss carryovers available to offset the liability. The net liability as of December 31, 2013, was $24 million, which includes interest of $4 million and is net of $6 million in payments made in advance of settlements.
The net liability recorded for tax positions across all jurisdictions that, if sustained, would affect our effective tax rate was $12 million as of December 31, 2014, and $16 million as of December 31, 2013, which includes interest of $3 million and $4 million, respectively.
During fourth quarter 2013, we received a final examination report from the IRS regarding our years under exam. As a result, we recognized a benefit for the reduction of our unrecognized tax benefits primarily relating to alternative fuel mixture credits. In addition, we recognized a benefit for a reduction of interest accrued primarily related to the U.S./Canada Competent Authority settlement.
In accordance with our accounting policy, we accrue interest and penalties related to unrecognized tax benefits as a component of income tax expense.
As of December 31, 2014, no U.S. federal income tax returns are under examination, with years 2011 forward subject to examination. No state jurisdictions are under examination, with years 2009 forward subject to examination. We are undergoing and are subject to examinations in various foreign jurisdictions for tax years 2005 forward. We expect that the outcome of any examination will not have a material effect on our consolidated financial statements; however, audit outcomes and the timing of audit settlements are subject to significant uncertainty.
In the next 12 months, we estimate a decrease of up to $6 million in unrecognized tax benefits due to resolution of examinations.

GEOGRAPHIC_AREAS

GEOGRAPHIC AREAS	12 Months Ended
	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
GEOGRAPHIC AREAS	GEOGRAPHIC AREAS
	This note provides selected key financial data according to the geographical locations of our customers. The selected key financial data includes:
	•	sales to unaffiliated customers,
	•	export sales from the U.S., and
	•	long-lived assets.
	SALES
	Our sales to unaffiliated customers outside the U.S. are primarily to customers in Canada, China, Japan and Europe. Our export sales include:
	•	pulp, liquid packaging board, logs, lumber and wood chips to Japan;
	•	pulp, logs and lumber to other Pacific Rim countries; and
	•	pulp and plywood to Europe.
	Sales by Geographic Area
	FOR THE THREE-YEAR PERIOD ENDED DECEMBER 31, 2014
	(DOLLAR AMOUNTS IN MILLIONS)
		2014		2013		2012
	Sales to unaffiliated customers:
	U.S.	$	4,889	$	4,761	$	3,867
	Japan	682		758		639
	Europe	328		298		300
	China	477		453		360
	Canada	424		418		302
	South America	87		80		74
	Other foreign countries	516		486		447
	Total	$	7,403	$	7,254	$	5,989
	Export sales from the U.S.:
	Japan	$	620	$	676	$	583
	China	416		411		329
	Other	856		804		770
	Total	$	1,892	$	1,891	$	1,682
	LONG-LIVED ASSETS
	Our long-lived assets — used in the generation of revenues in the different geographical areas — are nearly all in the U.S. and Canada. Our long-lived assets include:
	•	goodwill,
	•	timber and timberlands and
	•	property and equipment, including construction in progress.
	Long-Lived Assets by Geographic Area
	DOLLAR AMOUNTS IN MILLIONS
		December 31,		December 31,		December 31,
		2014		2013		2012
	Long-lived assets:
	U.S.(1)	$	8,069	$	8,116	$	5,523
	Canada	579		652		728
	Other foreign countries	676		670		672
	Total	$	9,324	$	9,438	$	6,923
	(1) Includes assets of discontinued operations in 2013 and 2012.
	Long-lived assets in the U.S. increased primarily due to the acquisition of Longview Timber. See Note 4: Longview Timber Purchase for more information.

SELECTED_QUARTERLY_FINANCIAL_I

SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited)	SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited)
	Quarterly financial data provides a review of our results and performance throughout the year. Our earnings per share for the full year do not always equal the sum of the four quarterly earnings-per share amounts because of common share activity during the year.
	Key Quarterly Financial Data for the Last Two Years
	DOLLAR AMOUNTS IN MILLIONS EXCEPT PER-SHARE FIGURES
		First		Second		Third		Fourth			Full Year
		Quarter		Quarter		Quarter(1)		Quarter(2)
	2014:00:00
	Net sales	$	1,736	$	1,964	$	1,915	$	1,788		$	7,403
	Operating income	$	308	$	400	$	318	$	294		$	1,320
	Earnings from continuing operations before income taxes	$	234	$	328	$	237	$	214		$	1,013
	Net earnings	$	194	$	291	$	1,164	$	177		$	1,826
	Net earnings attributable to Weyerhaeuser common shareholders	$	183	$	280	$	1,153	$	166		$	1,782
	Basic net earnings per share attributable to Weyerhaeuser common shareholders	$	0.31	$	0.48	$	2.17	$	0.32		$	3.2
	Diluted net earnings per share attributable to Weyerhaeuser common shareholders	$	0.31	$	0.47	$	2.15	$	0.31		$	3.18
	Dividends paid per share	$	0.22	$	0.22	$	0.29	$	0.29		$	1.02
	Market prices - high/low	$31.59 - $28.63		$33.26 - $27.48		$34.60 - $31.09		$36.88 - $31.61			$36.88 - $27.48
	2013:00:00
	Net sales	$	1,755	$	1,874	$	1,857	$	1,768		$	7,254
	Operating income (loss)	$	253	$	293	$	243	$	(155	)	$	634
	Earnings (loss) from continuing operations before income taxes	$	181	$	221	$	170	$	(252	)	$	320
	Net earnings	$	144	$	198	$	167	$	54		$	563
	Net earnings attributable to Weyerhaeuser common shareholders	$	144	$	196	$	157	$	43		$	540
	Basic net earnings per share attributable to Weyerhaeuser common shareholders	$	0.26	$	0.35	$	0.27	$	0.07		$	0.95
	Diluted net earnings per share attributable to Weyerhaeuser common shareholders	$	0.26	$	0.35	$	0.27	$	0.07		$	0.95
	Dividends paid per share	$	0.17	$	0.2	$	0.22	$	0.22		$	0.81
	Market prices - high/low	$31.74 - $28.36		$33.24 - $26.38		$29.86 - $26.64		$32.00 - $28.01			$33.24 - $26.38
	(1) Third Quarter 2014 includes a $972 million net gain on the Real Estate Divestiture recognized in 2014. See Note 3: Discontinued Operations for more information.
	(2) Fourth Quarter 2013 includes a $356 million noncash impairment charge. See Note 18: Charges for Restructuring, Closures and Asset Impairments for more information.

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Real Estate Investment Trust Election (REIT)	OUR ELECTION TO BE TAXED AS A REAL ESTATE INVESTMENT TRUST (REIT)
	Starting with our 2010 fiscal year, we elected to be taxed as a REIT. We expect to derive most of our REIT income from investments in timberlands, including the sale of standing timber through pay-as-cut sales contracts. REIT income can be distributed to shareholders without first paying corporate level tax, substantially eliminating the double taxation on income. A significant portion of our timberland segment earnings receives this favorable tax treatment. We are, however, subject to corporate taxes on built-in-gains (the excess of fair market value over tax basis at January 1, 2010) on sales of real property (other than standing timber) held by the REIT during the first 10 years following the REIT conversion. We continue to be required to pay federal corporate income taxes on earnings of our Taxable REIT Subsidiary (TRS), which includes our manufacturing businesses and the portion of our Timberlands segment income included in the TRS.
Consolidationed Financial Statements	CONSOLIDATED FINANCIAL STATEMENTS
	Our consolidated financial statements provide an overall view of our results and financial condition. They include our accounts and the accounts of entities that we control, including:
	•	majority-owned domestic and foreign subsidiaries and
	•	variable interest entities in which we are the primary beneficiary.
	They do not include our intercompany transactions and accounts, which are eliminated, and noncontrolling interests are presented as a separate component of equity.
	We account for investments in and advances to unconsolidated equity affiliates using the equity method, with taxes provided on undistributed earnings. This means that we record earnings and accrue taxes in the period that the earnings are recorded by our unconsolidated equity affiliates.
	Throughout these Notes to Consolidated Financial Statements, unless specified otherwise, references to “Weyerhaeuser,” “we” and “our” refer to the consolidated company.
Business Segments	OUR BUSINESS SEGMENTS
	We are principally engaged in:
	•	growing and harvesting timber; and
	•	manufacturing, distributing and selling products made from trees.
	Our business segments are organized based primarily on products and services.
	Our Business Segments and Products
	SEGMENT	PRODUCTS AND SERVICES
	Timberlands	Logs, timber, minerals, oil and gas and international wood products
	Wood Products	Softwood lumber, engineered wood products, structural panels and building materials distribution
	Cellulose Fibers	Pulp, liquid packaging board and an equity interest in a newsprint joint venture
	We also transfer raw materials, semifinished materials and end products among our business segments. Because of this intracompany activity, accounting for our business segments involves:
	•	pricing products transferred between our business segments at current market values and
	•	allocating joint conversion and common facility costs according to usage by our business segment product lines.
	Gains or charges not related to or allocated to an individual operating segment are held in Unallocated Items. This includes a portion of items such as: share-based compensation; pension and postretirement costs; foreign exchange transaction gains and losses associated with financing; and the elimination of intersegment profit in inventory and the LIFO reserve.
Foreign Currency Translation	FOREIGN CURRENCY TRANSLATION
	Local currencies are the functional currencies for most of our operations outside the U.S. We translate foreign currencies into U.S. dollars in two ways:
	•	assets and liabilities — at the exchange rates in effect as of our balance sheet date; and
	•	revenues and expenses — at average monthly exchange rates throughout the year.
Estimates	ESTIMATES
	We prepare our financial statements according to U.S. generally accepted accounting principles (U.S. GAAP). This requires us to make estimates and assumptions during our reporting periods and at the date of our financial statements. The estimates and assumptions affect our:
	•	reported amounts of assets, liabilities and equity;
	•	disclosure of contingent assets and liabilities; and
	•	reported amounts of revenues and expenses.
	While we do our best in preparing these estimates, actual results can and do differ from those estimates and assumptions.
Fair Value Measurements	FAIR VALUE MEASUREMENTS
	We use a fair value hierarchy in accounting for certain nonfinancial assets and liabilities including:
	•	long-lived assets (asset groups) measured at fair value for an impairment assessment,
	•	reporting units measured at fair value in the first step of a goodwill impairment test,
	•	nonfinancial assets and nonfinancial liabilities measured at fair value in the second step of a goodwill impairment assessment,
	•	assets acquired and liabilities assumed in a business acquisition and
	•	asset retirement obligations initially measured at fair value.
	The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions.
	The fair value hierarchy consists of the following three levels:
	•	Level 1 — Inputs are quoted prices in active markets for identical assets or liabilities.
	•	Level 2 — Inputs are:
	– quoted prices for similar assets or liabilities in an active market;
	– quoted prices for identical or similar assets or liabilities in markets that are not active; or
	– inputs other than quoted prices that are observable and market-corroborated inputs, which are derived principally from or corroborated by observable market data.
	•	Level 3 — Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
Changes in How We Report Our Results	CHANGES IN HOW WE REPORT OUR RESULTS
	Changes in how we report our results come from:
	•	accounting changes made upon our adoption of new accounting guidance and
	•	our reclassification of certain balances and results from prior years to make them consistent with our current reporting.
	RECLASSIFICATIONS
	We have reclassified certain balances and results from the prior years to be consistent with our 2014 reporting. This makes year-to-year comparisons easier. Our reclassifications had no effect on net earnings or Weyerhaeuser shareholders’ interest. Our reclassifications present the results of operations discontinued in 2014 separately on our Consolidated Statement of Operations, Consolidated Balance Sheet and in the related footnotes. Note 3: Discontinued Operations provides more information about our discontinued operations.
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTS
	In March 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2013-05, which provides guidance on a parent’s accounting for the cumulative translation adjustment upon derecognition of a subsidiary or group of assets within a foreign entity. This new guidance requires that the parent release any related cumulative translation adjustment into net income only if the sale or transfer results in the complete or substantially complete liquidation of the foreign entity in which the subsidiary or group of assets had resided. Our prospective adoption of this guidance in first quarter 2014 did not have a material effect on our results of operations, financial position or cash flows.
	In July 2013, FASB issued ASU 2013-11, which provides guidance on the presentation of unrecognized tax benefits, reflecting the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses or tax credit carryforwards exist. Our prospective adoption of this guidance in first quarter 2014 did not have a material effect on our results of operations, financial position or cash flows.
	In April 2014, FASB issued ASU 2014-08, an amendment to the current model of the classification and presentation of discontinued operations and asset disposals that changes the definition of a discontinued operation to include only disposals of components of an entity that represent a strategic shift that has (or will have) a material effect on an entity's financial results. The new standard is effective for all disposals or classifications as assets held for sale for fiscal periods starting after December 15, 2014 and early adoption is permitted. We expect to adopt ASU 2014-08 on January 1, 2015 and have determined that its adoption will not have a material impact on our consolidated financial statements and related disclosures at that time.
	In May 2014, FASB issued ASU 2014-09, a comprehensive new revenue recognition model that requires an entity to recognize revenue to depict the transfer of goods or services to customers at an amount that reflects the consideration it expects to receive in exchange for those goods or services. The new standard is effective for us on January 1, 2017 and early adoption is not permitted. We may use either the retrospective or cumulative effect transition method. We are evaluating the impact that ASU 2014-09 will have on our consolidated financial statements and related disclosures. We have not yet selected a transition method nor determined the effect of the standard on our ongoing financial reporting.
Property and Equipment	Property and Equipment
	We maintain property accounts on an individual asset basis. Here is how we handle major items:
	•	Improvements to and replacements of major units of property are capitalized.
	•	Maintenance, repairs and minor replacements are expensed.
	•	Depreciation is calculated using a straight-line method at rates based on estimated service lives.
	•	Logging roads are generally amortized — as timber is harvested — at rates based on the volume of timber estimated to be removed.
	•	Cost and accumulated depreciation of property sold or retired are removed from the accounts and the gain or loss is included in earnings.
Timber and Timberlands	Timber and Timberlands
	We carry timber and timberlands at cost less depletion charged to disposals. Depletion refers to the carrying value of timber that is harvested, lost as a result of casualty, or sold.
	Key activities affecting how we account for timber and timberlands include:
	•	reforestation,
	•	depletion and
	•	forest management in Canada.
	Reforestation. Generally, we capitalize initial site preparation and planting costs as reforestation. We transfer reforestation to a merchantable timber classification when the timber is considered harvestable. That generally occurs after:
	•	15 years in the South and
	•	30 years in the West.
	Generally, we expense costs after the first planting as they are incurred or over the period of expected benefit. These costs include:
	•	fertilization,
	•	vegetation and insect control,
	•	pruning and precommercial thinning,
	•	property taxes and
	•	interest.
	Accounting practices for these costs do not change when timber becomes merchantable and harvesting starts.
	Depletion. To determine depletion rates, we divide the net carrying value of timber by the related volume of timber estimated to be available over the growth cycle. To determine the growth cycle volume of timber, we consider:
	•	regulatory and environmental constraints,
	•	our management strategies,
	•	inventory data improvements,
	•	growth rate revisions and recalibrations and
	•	known dispositions and inoperable acres.
	We include the cost of timber harvested in the carrying values of raw materials and product inventories. As these inventories are sold to third parties, we include them in the cost of products sold.
	Forest management in Canada. We managed timberlands under long-term licenses in various Canadian provinces that are:
	•	granted by the provincial governments;
	•	granted for initial periods of 15 to 25 years; and
	•	renewable provided we meet reforestation, operating and management guidelines.
	Calculation of the fees we pay on the timber we harvest:
	•	varies from province to province,
	•	is tied to product market pricing and
	•	depends upon the allocation of land management responsibilities in the license.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
	We review long-lived assets — including certain identifiable intangibles — for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Impaired assets held for use are written down to fair value. Impaired assets held for sale are written down to fair value less cost to sell. We determine fair value based on:
	•	appraisals,
	•	market pricing of comparable assets,
	•	discounted value of estimated cash flows from the asset and
	•	replacement values of comparable assets.
Goodwill	Goodwill
	Goodwill is the purchase price minus the fair value of net assets acquired when we buy another entity. We assess goodwill for impairment:
	•	using a fair-value-based approach and
	•	at least annually — at the beginning of the fourth quarter.
	In 2014 the fair value of the reporting unit with goodwill substantially exceeded its carrying value.
Financial Instruments	Financial Instruments
	We estimate the fair value of financial instruments where appropriate. The assumptions we use — including the discount rate and estimates of cash flows — can significantly affect our fair-value amounts. Our fair values are estimates and may not match the amounts we would realize upon sale or settlement of our financial positions.
	To estimate the fair value of long-term debt, we used the following valuation approaches:
	•	market approach — based on quoted market prices we received for the same types and issues of our debt; or
	•	income approach — based on the discounted value of the future cash flows using market yields for the same type and comparable issues of debt.
	The inputs to these valuations are based on market data obtained from independent sources or information derived principally from observable market data.
	The difference between the fair value and the carrying value represents the theoretical net premium or discount we would pay or receive to retire all debt at the measurement date.
Cash and Cash Equivalents and Accounts Payable	Cash and Cash Equivalents
	Cash equivalents are investments with original maturities of 90 days or less. We state cash equivalents at cost, which approximates market.
	Accounts Payable
	Our banking system replenishes our major bank accounts daily as checks we have issued are presented for payment. As a result, we have negative book cash balances due to outstanding checks that have not yet been paid by the bank. These negative balances are included in accounts payable on our Consolidated Balance Sheet. Changes in these negative cash balances are reported as financing activities in our Consolidated Statement of Cash Flows. We had no negative book cash balances as of December 31, 2014 and December 31, 2013.
Concentration of Risk	Concentration of Risk
	We disclose customers that represent a concentration of credit risk. As of December 31, 2014, one customer accounted for approximately 13 percent of our accounts receivable balance.
Revenue Recognition	Revenue Recognition
	Operations generally recognize revenue upon shipment to customers. For certain export sales, revenue is recognized when title transfers at the foreign port.
	For timberland sales, we recognize revenue when title and possession have been transferred to the buyer and all other criteria for sale and profit recognition have been satisfied.
Inventories	Inventories
	We state inventories at the lower of cost or market. Cost includes labor, materials and production overhead. LIFO — the last-in, first-out method — applies to major inventory products held at our U.S. domestic locations. We began to use the LIFO method for domestic products in the 1940s as required to conform with the tax method elected. Subsequent acquisitions of entities added new products under the FIFO — the first-in, first-out method — or moving average cost methods that have continued under those methods. The FIFO or moving average cost methods applies to the balance of our domestic raw material and product inventories as well as for all material and supply inventories and all foreign inventories.
Shipping and Handling Costs	Shipping and Handling Costs
	We classify shipping and handling costs in the costs of products sold in our Consolidated Statement of Operations.
Income Taxes	Income Taxes
	We account for income taxes under the asset and liability method. Unrecognized tax benefits represent potential future funding obligations to taxing authorities if uncertain tax positions the company has taken on previously filed tax returns are not sustained. In accordance with the company’s accounting policy, accrued interest and penalties related to unrecognized tax benefits are recognized as a component of income tax expense.
	We recognize deferred tax assets and liabilities to reflect:
	•	future tax consequences due to differences between the carrying amounts for financial purposes and the tax bases of certain items and
	•	operating loss and tax credit carryforwards.
	To measure deferred tax assets and liabilities, we:
	•	determine when the differences between the carrying amounts and tax bases of affected items are expected to be recovered or resolved and
	•	use enacted tax rates expected to apply to taxable income in those years.
Share-Based Compensation	Share-Based Compensation
	We generally measure the fair value of share-based awards on the dates they are granted or modified. These measurements establish the cost of the share-based awards for accounting purposes. We then recognize the cost of share-based awards in our Consolidated Statement of Operations over each employee’s required service period. Note 17: Share-Based Compensation provides more information about our share-based compensation.
	HOW WE ACCOUNT FOR SHARE-BASED AWARDS
	We:
	•	use a fair-value-based measurement for share-based awards, and
	•	recognize the cost of share-based awards in our consolidated financial statements.
	We recognize the cost of share-based awards in our Consolidated Statement of Operations over the required service period — generally the period from the date of the grant to the date when it is vested. Special situations include:
	•	Awards that vest upon retirement — the required service period ends on the date an employee is eligible for retirement, including early retirement.
	•	Awards that continue to vest following job elimination or the sale of a business — the required service period ends on the date the employment from the company is terminated.
	In these special situations, compensation expense from share-based awards is recognized over a period that is shorter than the stated vesting period.
Pension and Other Postretirement Benefit Plans	Pension and Other Postretirement Benefit Plans
	We recognize the overfunded or underfunded status of our defined benefit pension and other postretirement plans on our Consolidated Balance Sheet and recognize changes in the funded status through comprehensive income (loss) in the year in which the changes occur.
	Actuarial valuations determine the amount of the pension and other postretirement benefit obligations and the net periodic benefit cost we recognize. The net periodic benefit cost includes:
	•	cost of benefits provided in exchange for employees’ services rendered during the year;
	•	interest cost of the obligations;
	•	expected long-term return on fund assets;
	•	gains or losses on plan settlements and curtailments;
	•	amortization of prior service costs and plan amendments over the average remaining service period of the active employee group covered by the plans or the average remaining life expectancy in situations where the plan participants affected by the plan amendment are inactive; and
	•	amortization of cumulative unrecognized net actuarial gains and losses — generally in excess of 10 percent of the greater of the benefit obligation or market-related value of plan assets at the beginning of the year — over the average remaining service period of the active employee group covered by the plans or the average remaining life expectancy in situations where the plan participants are inactive.
	Pension plans. We have pension plans covering most of our employees. Determination of benefits differs for salaried, hourly and union employees:
	•	Salaried employee benefits are based on each employee’s highest monthly earnings for five consecutive years during the final 10 years before retirement.
	•	Hourly and union employee benefits generally are stated amounts for each year of service.
	•	Union employee benefits are set through collective-bargaining agreements.
	We contribute to our U.S. and Canadian pension plans according to established funding standards. The funding standards for the plans are:
	•	U.S. pension plans — according to the Employee Retirement Income Security Act of 1974; and
	•	Canadian pension plans — according to the applicable provincial pension act and the Income Tax Act.
	Postretirement benefits other than pensions. We provide certain postretirement health care and life insurance benefits for some retired employees. In some cases, we pay a portion of the cost of the benefit. Note 9: Pension and Other Postretirement Benefit Plans provides additional information about changes made in our postretirement benefit plans during 2014 and 2013.
Environmental Remediation	Environmental Remediation
	We accrue losses associated with environmental remediation obligations when such losses are probable and reasonably estimable. Future expenditures for environmental remediation obligations are not discounted to their present value. Recoveries of environmental remediation costs from other parties are recorded as assets when the recovery is deemed probable and does not exceed the amount of losses previously recorded.
	Estimates. We believe it is reasonably possible, based on currently available information and analysis, that remediation costs for all identified sites may exceed our existing reserves by up to $108 million.
	This estimate, in which those additional costs may be incurred over several years, is the upper end of the range of reasonably possible additional costs. The estimate:
	•	is much less certain than the estimates on which our accruals currently are based, and
	•	uses assumptions that are less favorable to us among the range of reasonably possible outcomes.
	In estimating our current accruals and the possible range of additional future costs, we:
	•	assumed we will not bear the entire cost of remediation of every site,
	•	took into account the ability of other potentially responsible parties to participate, and
	•	considered each party’s financial condition and probable contribution on a per-site basis.
Earnings Per Share, Policy	We use the treasury stock method to calculate the effect of our outstanding stock options, restricted stock units and performance share units. Share-based payment awards that are contingently issuable upon the achievement of specified performance or market conditions are included in our diluted earnings per share calculation in the period in which the conditions are satisfied.
	We use the if-converted method to calculate the effect of our outstanding preference shares. In applying the if-converted method, conversion is not assumed for purposes of computing diluted earnings per share if the effect would be antidilutive. Preference shares are antidilutive whenever the amount of the dividend declared in or accumulated for the current period per common share obtainable on conversion exceeds diluted earnings per share exclusive of the preference shares.
	Preference shares are evaluated for participation on a quarterly basis to determine whether two-class presentation is required. Preference shares are considered to be participating as of the financial reporting period end to the extent they would participate in dividends paid to common shareholders. Preference shares are not considered participating for the years ended December 31, 2014 and 2013. Under the provisions of the two-class method, basic and diluted earnings per share would be presented for both preference and common shareholders.
Pension and Other Postretirement Plans, Pensions, Policy	Valuation of Our Plan Assets
	The pension assets are stated at fair value based upon the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the reporting date. We do not value pension investments based upon a forced or distressed sale scenario. Instead, we consider both observable and unobservable inputs that reflect assumptions applied by market participants when setting the exit price of an asset or liability in an orderly transaction within the principal market of that asset or liability.
	We value the pension plan assets based upon the observability of exit pricing inputs and classify pension plan assets based upon the lowest level input that is significant to the fair value measurement of the pension plan assets in their entirety. The fair value hierarchy we follow is outlined below;
	Level 1: Inputs are unadjusted quoted prices for identical assets and liabilities traded in an active market.
	Level 2: Inputs are quoted prices in non-active markets for which pricing inputs are observable either directly or indirectly at the reporting date.
	Level 3: Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
	The pension assets are comprised of cash and short-term investments, derivative contracts, common and preferred stock and fund units. The fund units are typically limited liability interests in hedge funds, private equity funds, real estate funds and cash funds. Each of these assets participates in its own unique principal market.
	Cash and short-term investments, when held directly, are valued at cost.
	Common and preferred stocks are valued at exit prices quoted in the public markets.
	Derivative contracts held by our pension trusts are not publicly traded and each derivative contract is specifically negotiated with a unique financial counterparty and references either illiquid fund units or a unique number of synthetic units of a publicly reported market index. The derivative contracts are valued based upon valuation statements received from the financial counterparties.
	Fund units are valued based upon the net asset values of the funds which we believe represent the per-unit prices at which new investors are permitted to invest and the prices at which existing investors are permitted to exit. To the degree net asset values as of the end of the year have not been received, we use the most recently reported net asset values and adjust for market events and cash flows that have occurred between the interim date and the end of the year to estimate the fair values as of the end of the year.
	Assets that do not have readily available quoted prices in an active market require a higher degree of judgment to value and have a higher degree of risk that the value that could have been realized upon sale as of the valuation date could be different from the reported value than assets with observable pricing inputs. It is possible that the full extent of market price, liquidity, currency, interest rate, or credit risks may not be fully factored into the fair values of our pension plan assets that use significant unobservable inputs. Approximately $4.8 billion, or 85.8 percent, of our pension plan assets were classified as Level 3 assets as of December 31, 2014.
	We estimate the fair value of pension plan assets based upon the information available during the year-end reporting process. In some cases, primarily private equity funds, the information available consists of net asset values as of an interim date, cash flows between the interim date and the end of the year, and market events. When the difference is significant, we revise the year-end estimated fair value of pension plan assets to incorporate year-end net asset values received after we have filed our annual report on Form 10-K.

BUSINESS_SEGMENTS_Tables

BUSINESS SEGMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Sales and Contribution (Charge) to Earnings	Sales and Contribution (Charge) to Earnings
	DOLLAR AMOUNTS IN MILLIONS
		TIMBERLANDS			WOOD			CELLULOSE			UNALLOCATED ITEMS(1) AND INTERSEGMENT ELIMINATIONS			CONSOLIDATED
					PRODUCTS			FIBERS
	Sales to unaffiliated customers
	2014	$	1,497		$	3,970		$	1,936		$	—		$	7,403
	2013	$	1,343		$	4,009		$	1,902		$	—		$	7,254
	2012	$	1,077		$	3,058		$	1,854		$	—		$	5,989
	Intersegment sales
	2014	$	867		$	80		$	—		$	(947	)	$	—
	2013	$	799		$	71		$	—		$	(870	)	$	—
	2012	$	683		$	74		$	—		$	(757	)	$	—
	Contribution (charge) to earnings from continuing operations
	2014	$	613		$	327		$	291		$	126		$	1,357
	2013	$	470		$	441		$	200		$	(422	)	$	689
	2012	$	322		$	120		$	223		$	2		$	667
	(1) Unallocated Items are gains or charges not related to or allocated to an individual operating segment. They include a portion of items such as: share-based compensation, pension and postretirement costs, foreign exchange transaction gains and losses associated with financing, and the elimination of intersegment profit in inventory and the LIFO reserve.
Reconciliation of Contribution to Earnings to Net Earnings Attributable to Weyerhaeuser	Reconciliation of Contribution to Earnings to Net Earnings Attributable to Weyerhaeuser
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Net contribution to earnings from continuing operations	$	1,357		$	689		$	667
	Net contribution to earnings from discontinued operations	1,017			116			121
	Total contribution to earnings	2,374			805			788
	Interest expense, net of capitalized interest (continuing and discontinued operations)	(347		)	(371		)	(348		)
	Income before income taxes (continuing and discontinued operations)	2,027			434			440
	Income taxes (continuing and discontinued operations)	(201		)	129			(55		)
	Net earnings attributable to Weyerhaeuser	$	1,826		$	563		$	385
Additional Financial Information	Additional Financial Information
	DOLLAR AMOUNTS IN MILLIONS
		TIMBERLANDS			WOOD			CELLULOSE			UNALLOCATED			CONSOLIDATED
					PRODUCTS			FIBERS			ITEMS
	Depreciation, depletion and amortization
	2014	$	207		$	119		$	155		$	12		$	493
	2013	$	166		$	123		$	156		$	13		$	458
	2012	$	142		$	133		$	150		$	19		$	444
	Net pension and postretirement cost (credit)(1)
	2014	$	10		$	24		$	11		$	(45	)	$	—
	2013	$	10		$	28		$	18		$	40		$	96
	2012	$	8		$	25		$	14		$	29		$	76
	Charges for restructuring, closures and impairments(2)
	2014	$	1		$	2		$	—		$	41		$	44
	2013	$	2		$	13		$	—		$	362		$	377
	2012	$	2		$	6		$	—		$	18		$	26
	Equity in income (loss) of equity affiliates and unconsolidated entities
	2014	$	—		$	—		$	(1	)	$	(1	)	$	(2	)
	2013	$	—		$	—		$	3		$	8		$	11
	2012	$	—		$	—		$	5		$	(3	)	$	2
	Capital expenditures
	2014	$	74		$	190		$	123		$	4		$	391
	2013	$	73		$	113		$	92		$	5		$	283
	2012	$	60		$	56		$	160		$	5		$	281
	Investments in and advances to equity affiliates and unconsolidated entities
	2014	$	—		$	—		$	188		$	—		$	188
	2013	$	—		$	—		$	190		$	—		$	190
	2012	$	—		$	—		$	191		$	1		$	192
	Total assets(3)(4)
	2014	$	7,327		$	1,430		$	2,214		$	2,486		$	13,457
	2013	$	7,578		$	1,326		$	2,299		$	3,374		$	14,577
	2012	$	4,697		$	1,319		$	2,386		$	4,190		$	12,592
	(1) Net pension and postretirement cost (credit) excludes special items, as well as the recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures. See Note 9: Pension and Other Postretirement Benefit Plans for more information.
	(2)   See Note 18: Charges for Restructuring, Closures and Asset Impairments for more information
	(3) Timberlands total assets increased primarily due to the acquisition of Longview Timber. See Note 4: Longview Timber Purchase for more information.
	(4) Unallocated Items total assets includes assets of discontinued operations in 2013 and 2012.

DISCONTINUED_OPERATIONS_Tables

DISCONTINUED OPERATIONS (Tables)	12 Months Ended
	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Components of the net gain on divestiture	The following table presents the components of the net gain on divestiture:
	DOLLAR AMOUNTS IN MILLIONS
		2014
	Proceeds:
	Common shares tendered (58,813,151 shares at $33.22 per share)	$	1,954
	Cash	707
		2,661
	Less:
	Net book value of contributed assets	(1,671		)
	Transaction costs, net of reimbursement	(18		)
		(1,689		)
	Gain on WRECO divestiture	$	972
Sales and Net Earnings from Discontinued Operations	Sales and Net Earnings from Discontinued Operations
	DOLLAR AMOUNTS IN MILLIONS
		2014(1)			2013			2012
	Net sales from discontinued operations	$	573		$	1,275		$	1,070
	Income from discontinued operations	42			114			117
	Income taxes	(16		)	(42		)	(45		)
	Net income from operations	26			72			72
	Net gain on divestiture	972			—			—
	Net earnings from discontinued operations	998			$	72		$	72
	(1) Discontinued operations in 2014 covered only 188 days.
Carrying Value of Assets and Liabilities of Discontinued Operations	Carrying Value of Assets and Liabilities of Discontinued Operations
	DOLLAR AMOUNTS IN MILLIONS
		December 31, 2013
	Assets
	Cash and cash equivalents	$	5
	Receivables, less discounts and allowances	51
	Prepaid expenses	11
	Deferred tax assets	21
	Total current assets	88
	Property and equipment, net	15
	Real estate in process of development and for sale	851
	Land being processed for development	596
	Investments in and advances to equity affiliates	21
	Deferred tax assets	115
	Other assets	96
	Total noncurrent assets	1,694
	Total assets	$	1,782
	Liabilities
	Accounts payable	$	41
	Accrued liabilities	113
	Total current liabilities	154
	Long-term debt (nonrecourse to the company) held by variable interest entities	5
	Other liabilities	27
	Total noncurrent liabilities	32
	Total liabilities	$	186
	Noncontrolling interests	$	34

LONGVIEW_TIMBER_PURCHASE_Table

LONGVIEW TIMBER PURCHASE (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Summarized unaudited pro forma information	Summarized Unaudited Pro Forma Information that Presents Combined Amounts as if this Acquisition Occurred at the Beginning of 2012
	DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER-SHARE FIGURES
		2013		2012
	Net sales	$	7,371	$	6,166
	Net earnings from continuing operations attributable to Weyerhaeuser common shareholders	$	485	$	276
	Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, basic	$	0.84	$	0.48
	Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, diluted	$	0.83	$	0.47
Estimated Fair Values of Identifiable Assets Acquired and Liabilities Assumed	Estimated Fair Values of Identifiable Assets Acquired and Liabilities Assumed as of the Acquisition Date
	DOLLAR AMOUNTS IN MILLIONS
		July 23,		Measurement Period Adjustments		December 31,
		2013				2013
	Current assets	$	46	$	—	$	46
	Property and equipment	39		1		40
	Timber and timberlands	2,654		2		2,656
	Other assets	2		—		2
	Total assets acquired	2,741		3		2,744
	Current liabilities	10		—		10
	Long-term debt	1,122		—		1,122
	Other liabilities	5		3		8
	Total liabilities assumed	1,137		3		1,140
	Net assets acquired	$	1,604	$	—	$	1,604

NET_EARNINGS_PER_SHARE_Tables

NET EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2014
Potential Shares Not Included in the Computation of Diluted Earnings per Share	Potential Shares Not Included in the Computation of Diluted Earnings per Share
	Shares in thousands	2014	2013	2012
	Stock options	—	4,618	3,519
	Preference Shares	24,988	24,865	—

INVENTORIES_Tables

INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2014
Inventories as of the End of Our Last Two Years	Inventories as of the End of Our Last Two Years
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	LIFO inventories:
	Logs and chips	$	9	$	15
	Lumber, plywood and panels	55		46
	Pulp and paperboard	122		97
	Other products	11		11
	FIFO or moving average cost inventories:
	Logs and chips	38		33
	Lumber, plywood, panels and engineered wood products	80		70
	Pulp and paperboard	35		30
	Other products	96		94
	Materials and supplies	149		146
	Total	$	595	$	542

PROPERTY_AND_EQUIPMENT_Tables

PROPERTY AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Carrying Value of Property and Equipment and Estimated Service Lives	Carrying Value of Property and Equipment and Estimated Service Lives
	DOLLAR AMOUNTS IN MILLIONS
		RANGE OF LIVES	DECEMBER 31,			DECEMBER 31,
			2014			2013
	Property and equipment, at cost:
	Land	N/A	$	127		$	129
	Buildings and improvements	10–40	1,220			1,262
	Machinery and equipment	2–25	6,706			6,712
	Roads	10–20	609			594
	Other	3–10	285			319
	Total cost		8,947			9,016
	Allowance for depreciation and amortization		(6,324		)	(6,327		)
	Property and equipment, net		$	2,623		$	2,689

EQUITY_AFFILIATES_Tables

EQUITY AFFILIATES (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities of Equity Affiliates	Assets and Liabilities of Equity Affiliates
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Current assets	$	123		$	119
	Noncurrent assets	$	413		$	468
	Current liabilities	$	30		$	44
	Noncurrent liabilities	$	109		$	141
Operating Results of Equity Affiliates	Operating Results of Equity Affiliates
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013		2012
	Net sales	$	501		$	534	$	553
	Operating income (loss)	$	(2	)	$	3	$	3
	Net income (loss)	$	—		$	3	$	(7	)

PENSION_AND_OTHER_POSTRETIREME1

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2014
Changes in Projected Benefit Obligations of Our Pension and Other Postretirement Benefit Plans	Changes in Projected Benefit Obligations of Our Pension and Other Postretirement Benefit Plans
	DOLLAR AMOUNTS IN MILLIONS
		PENSION						OTHER
								POSTRETIREMENT
								BENEFITS
		2014			2013			2014			2013
	Reconciliation of projected benefit obligation:
	Projected benefit obligation beginning of year	$	5,834		$	6,575		$	321		$	433
	Service cost	53			64			1			1
	Interest cost	271			244			10			12
	Plan participants’ contributions	—			—			13			16
	Actuarial (gains) losses	1,006			(666		)	4			(23		)
	Foreign currency exchange rate changes	(87		)	(66		)	(7		)	(5		)
	Benefits paid (includes lump sum settlements)	(391		)	(317		)	(44		)	(50		)
	Plan amendments and other	1			—			2			(66		)
	Special/contractual termination benefits	7			—			—			—
	Plan transfer/Acquisitions	4			—			3			3
	Projected benefit obligation at end of year	$	6,698		$	5,834		$	303		$	321
Changes in Fair Value of Plan Assets	Changes in Fair Value of Plan Assets
	DOLLAR AMOUNTS IN MILLIONS
		PENSION						OTHER
								POSTRETIREMENT
								BENEFITS
		2014			2013			2014			2013
	Fair value of plan assets at beginning of year (estimated)	$	5,614		$	5,022		$	—		$	—
	Adjustment for final fair value of plan assets	53			55			—			—
	Actual return on plan assets	368			808			—			—
	Foreign currency exchange rate changes	(75		)	(57		)	—			—
	Employer contributions and benefit payments	70			103			31			34
	Plan participants’ contributions	—			—			13			16
	Plan transfer/Acquisitions	4			—			—			—
	Benefits paid (includes lump sum settlements)	(391		)	(317		)	(44		)	(50		)
	Fair value of plan assets at end of year (estimated)	$	5,643		$	5,614		$	—		$	—
Funded Status of Our Pension and Other Postretirement Benefit Plans	Funded Status of Our Pension and Other Postretirement Benefit Plans
	DOLLAR AMOUNTS IN MILLIONS
		PENSION						OTHER
								POSTRETIREMENT
								BENEFITS
		2014			2013			2014			2013
	Noncurrent assets	$	8		$	35		$	—		$	—
	Current liabilities	(21		)	(22		)	(26		)	(35		)
	Noncurrent liabilities	(1,042		)	(233		)	(277		)	(283		)
	Funded status	$	(1,055	)	$	(220	)	$	(303	)	$	(318	)
Schedule of Allocation of Plan Assets	The net pension plan assets, when categorized in accordance with this fair value hierarchy, are as follows:
	DOLLAR AMOUNTS IN MILLIONS
	2014	Level 1			Level 2			Level 3			Total
	Pension trust investments:
	Fixed income instruments	$	646		$	36		$	3		$	685
	Hedge funds	103			(22		)	3,333			3,414
	Private equity and related funds	—			3			1,422			1,425
	Real estate and related funds	—			—			82			82
	Common and preferred stock and equity index instruments	25			12			—			37
	Total pension trust investments	$	774		$	29		$	4,840		$	5,643
	Accrued liabilities, net										(13		)
	Pension trust net assets										$	5,630
	Canadian nonregistered plan assets:
	Cash	$	7		$	—		$	—		$	7
	Investments	6			—			—			6
	Total Canadian nonregistered plan assets	$	13		$	—		$	—		$	13
	Total plan assets										$	5,643
	DOLLAR AMOUNTS IN MILLIONS
	2013	Level 1			Level 2			Level 3			Total
	Pension trust investments:
	Fixed income instruments	$	567		$	68		$	3		$	638
	Hedge funds	—			(7		)	3,225			3,218
	Private equity and related funds	—			(2		)	1,606			1,604
	Real estate and related funds	—			—			101			101
	Common and preferred stock and equity index instruments	23			29			—			52
	Total pension trust investments	$	590		$	88		$	4,935		$	5,613
	Accrued liabilities, net										(13		)
	Pension trust net investments										$	5,600
	Canadian nonregistered plan assets:
	Cash	$	8		$	—		$	—		$	8
	Investments	6			—			—			6
	Total Canadian nonregistered plan assets	$	14		$	—		$	—		$	14
	Total plan assets										$	5,614
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets	A reconciliation of the beginning and ending balances of the pension plan assets measured at fair value using significant unobservable inputs (Level 3) is presented below:
	DOLLAR AMOUNTS IN MILLIONS
		INVESTMENTS
		Hedge funds			Private equity  and			Real estate and			Fixed Income			Total
					related funds			related funds
	Balance as of December 31, 2012	$	2,767		$	1,577		$	91		$	4		$	4,439
	Net realized gains (losses)	164			90			(19		)	—			235
	Net change in unrealized appreciation (depreciation)	275			138			23			(1		)	435
	Purchases	743			188			29			—			960
	Sales	(645		)	(387		)	(23		)	—			(1,055		)
	Settlements	(79		)	—			—			—			(79		)
	Balance as of December 31, 2013	3,225			1,606			101			3			4,935
	Net realized gains (losses)	186			128			8			—			322
	Net change in unrealized appreciation (depreciation)	76			(130		)	(4		)	—			(58		)
	Purchases	541			177			5			—			723
	Sales	(540		)	(359		)	(28		)	—			(927		)
	Issuances	52			—			—			—			52
	Settlements	(132		)	—			—			—			(132		)
	Transfers, Out(1)	$	(75	)	—			—			—			(75		)
	Balance as of December 31, 2014	$	3,333		$	1,422		$	82		$	3		$	4,840
	(1) One hedge fund completed an initial public offering during 2014; as such the security was transferred from Level 3 to Level 1 in 2014.
Net Periodic Benefit Cost (Credit)	Net Periodic Benefit Cost (Credit)
	DOLLAR AMOUNTS IN MILLIONS
		PENSION									OTHER POSTRETIREMENT
											BENEFITS
		2014			2013			2012			2014			2013			2012
	Net periodic benefit cost (credit):
	Service cost(1)	$	53		$	64		$	53		$	1		$	1		$	1
	Interest cost	271			244			262			10			12			15
	Expected return on plan assets	(467		)	(439		)	(422		)	—			—			—
	Amortization of actuarial loss	125			221			175			12			14			13
	Amortization of prior service cost (credit)(2)(3)	5			7			7			(161		)	(23		)	(127		)
	Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	9			—			—			—			—			—
	Other	—			—			—			(4		)	—			4
	Net periodic benefit cost (credit)	$	(4	)	$	97		$	75		$	(142	)	$	4		$	(94	)
	(1)  Service cost includes $2 million in 2014, $4 million in 2013 and $3 million in 2012 for employees that were part of the Real Estate Divestiture. These charges are included in our results of discontinued operations. Curtailment and special termination benefits are related to involuntary terminations, due to restructuring activities, as well as the Real Estate Divestiture.
	(2) During fourth quarter 2011, we ratified amendments to our postretirement medical and life insurance benefit plans for U.S. salaried employees that reduced or eliminated certain benefits that were available to both past and present employees. The company recognized a gain of $103 million in 2012 due to these benefit changes. This gain is included in other operating income and reflected in the amortization of prior service credit in the table above. The benefit related to the fourth quarter 2011 amendments was fully recognized in first and second quarter 2012.
	(3) During fourth quarter 2013, the decision was ratified to eliminate Company funding of the Post-Medicare Health Reimbursement Account (HRA) for certain salaried retirees after 2014. This change was communicated to affected retirees during January 2014. As a result, we recognized a pretax gain of $151 million in 2014 from this plan amendment.
Estimated Amortization from Cumulative Other Comprehensive Loss in 2015	Estimated Amortization from Cumulative Other Comprehensive Loss in 2015
	Amortization of the net actuarial loss and prior service cost (credit) of our pension and postretirement benefit plans will affect our other comprehensive income in 2015. The net effect of the estimated amortization will be an increase in net periodic benefit costs or a decrease in net periodic benefit credits in 2015.
	DOLLAR AMOUNTS IN MILLIONS
		PENSION			OTHER POSTRETIREMENT BENEFITS			TOTAL
	Net actuarial loss	$	178		$	10		$	188
	Prior service cost (credit)	4			(9		)	(5		)
	Net effect cost	$	182		$	1		$	183
Estimated Projected Benefit Payments for the Next 10 Years	Estimated Projected Benefit Payments for the Next 10 Years
	DOLLAR AMOUNTS IN MILLIONS
		PENSION			OTHER
					POSTRETIREMENT
					BENEFITS
	2015	$	348		$	26
	2016	$	354		$	25
	2017	$	361		$	24
	2018	$	370		$	23
	2019	$	379		$	22
	2020-2024	$	1,979		$	98
Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation	Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation
		PENSION				OTHER POSTRETIREMENT
						BENEFITS
		DECEMBER 31,		DECEMBER 31,		DECEMBER 31,		DECEMBER 31,
		2014		2013		2014		2013
	Discount rates:
	United States	4.1	%	4.9	%	3.6	%	4	%
	Canada	3.9	%	4.7	%	3.8	%	4.6	%
	Lump sum distributions (US salaried and nonqualified plans only)(1)	PPA Table		PPA Table		N/A		N/A
	Rate of compensation increase:
	Salaried:
	United States	2.50% for 2014, 2015		2.50% for 2013, 2014		N/A		N/A
		and 3.50% thereafter		and 3.50% thereafter
	Canada	2.50% for 2014, 2015		2.50% for 2013, 2014		N/A		N/A
		and 3.50% thereafter		and 3.50% thereafter
	Hourly:
	United States	3	%	3	%	3	%	3	%
	Canada	3.25	%	3.25	%	N/A		N/A
	Election of lump sum or installment distributions (US salaried and nonqualified plans only)	60	%	60	%	N/A		N/A
	(1) The PPA Phased Table: Interest and mortality assumptions as mandated by Pension Protection Act of 2006 including the phase out of the prior interest rate basis in 2013.
Rates Used to Estimate Our Net Periodic Benefit Costs	Rates Used to Estimate Our Net Periodic Benefit Costs
		PENSION			OTHER
					POSTRETIREMENT
					BENEFITS
		2014	2013	2012	2014	2013	2012
	Discount rates:
	United States	4.90% for the first half of 2014 and 4.40% for the second half of 2014	3.70%	4.50%	4.00%	3.00%	4.10%
	Salaried – lump sum distributions (U.S. salaried and nonqualified plan only)(1)	PPA Table	PPA phased	PPA phased	N/A	N/A	N/A
			Table	Table
	Canada	4.70%	4.10%	4.90%	4.60%	4.00%	4.80%
	Expected return on plan assets:
	Qualified/registered plans	9.00%	9.00%	9.00%
	Nonregistered plans (Canada only)	3.50%	3.50%	3.50%
	Rate of compensation increase:
	Salaried:
	United States	2.50% for 2014	2.50% for 2013	2.00% for 2012	N/A	N/A	N/A
		and 3.50% thereafter	and 3.50% thereafter	and 3.50% thereafter
	Canada	2.50% for 2014	2.50% for 2013	2.10% for 2012	N/A	N/A	N/A
		and 3.50%  thereafter	and 3.50%  thereafter	and 3.50% thereafter
	Hourly:
	United States	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
	Canada	3.25%	3.25%	3.25%	N/A	N/A	N/A
	Election of lump sum distributions (U.S. salaried and nonqualified plans only)	60.00%	56.00%	60.00%	N/A	N/A	N/A
	(1) PPA Phased Table: Interest and mortality assumptions as mandated by Pension Protection Act of 2006 including the phase out of the prior interest rate basis in 2013.
Actual Returns on Assets Held by Our Pension Trusts
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Direct investments	$	258		$	568		$	324
	Derivatives	110			240			166
	Total	$	368		$	808		$	490
Assumptions We Use in Estimating Health Care Benefit Costs	Assumptions We Use in Estimating Health Care Benefit Costs
		2014				2013
		U.S.		CANADA		U.S.		CANADA
	Weighted health care cost trend rate assumed for next year	6.3	%	5.6	%	6.4	%	5.7	%
	Rate to which cost trend rate is assumed to decline (ultimate trend rate)	4.5	%	4.3	%	4.5	%	4.3	%
	Year that the rate reaches the ultimate trend rate	2029		2028		2029		2028
Effect of a1 Percent Change in Health Care Costs	Effect of a 1 Percent Change in Health Care Costs
	AS OF DECEMBER 31, 2014 (DOLLAR AMOUNTS IN MILLIONS)
		1% INCREASE			1% DECREASE
	Effect on total service and interest cost components	less than $1			less than $(1)
	Effect on accumulated postretirement benefit obligation	$	14		$	(12	)
Qualified and Registered Pension Plans
Schedule of Allocation of Plan Assets	Assets within our qualified and registered pension plans in our U.S. and Canadian pension trusts were invested as follows:
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	Fixed income	12.2	%	11.4	%
	Hedge funds	60.6		57.5
	Private equity and related funds	25.3		28.6
	Real estate and related funds	1.4		1.8
	Common and preferred stock and equity index instruments	0.7		0.9
	Accrued liabilities	(0.2	)	(0.2	)
	Total	100	%	100	%
Non Registered Canadian Pension Plans
Schedule of Allocation of Plan Assets	Assets within our nonregistered plans that we are allowed to manage were invested as follows:
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	Equities	52.8	%	55.5	%
	Cash and cash equivalents	47.2		44.5
	Total	100	%	100	%
Derivatives | Qualified and Registered Pension Plans
Schedule of Allocation of Plan Assets	This table shows the fair value of the derivatives held by our pension trusts — which fund our qualified and registered plans — at the end of the last two years.
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Equity index instruments	$	13		$	29
	Forward contracts	(32		)	(9		)
	Swaps	436			405
	Total	$	417		$	425
Derivatives, Aggregate Notional Amount | Qualified and Registered Pension Plans
Schedule of Allocation of Plan Assets	This table shows the aggregate notional amount of the derivatives held by our pension trusts — which fund our qualified and registered plans — at the end of the last two years.
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Equity index instruments	$	361		$	399
	Forward contracts	535			638
	Swaps	1,824			1,568
	Total	$	2,720		$	2,605

ACCRUED_LIABILITIES_Tables

ACCRUED LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued Liabilities	Accrued liabilities were comprised of the following:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	Wages, salaries and severance pay	$	161	$	159
	Pension and postretirement	47		57
	Vacation pay	47		48
	Income taxes	4		4
	Taxes – Social Security and real and personal property	24		32
	Interest	105		104
	Customer rebates and volume discounts	46		50
	Deferred income	75		82
	Other	78		93
	Total	$	587	$	629

LINES_OF_CREDIT_Tables

LINES OF CREDIT (Tables)	12 Months Ended
	Dec. 31, 2014
Other Letters of Credit and Surety Bonds	The amounts of other letters of credit and surety bonds we have entered into as of the end of our last two years are included in the following table:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,		DECEMBER 31,
		2014		2013
	Letters of credit	$	44	$	39
	Surety bonds	$	231	$	169

LONGTERM_DEBT_Tables

LONG-TERM DEBT (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Long-Term Debt by Types and Interest Rates (Includes Current Portion)	Long-Term Debt by Types and Interest Rates (Includes Current Portion)
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	6.95% debentures due 2017	$	281		$	281
	7.00% debentures due 2018	62			62
	7.375% notes due 2019	500			500
	Variable rate term loan credit facility due 2020	550			550
	9.00% debentures due 2021	150			150
	7.125% debentures due 2023	191			191
	4.625% notes due 2023	500			500
	8.50% debentures due 2025	300			300
	7.95% debentures due 2025	136			136
	7.70% debentures due 2026	150			150
	7.35% debentures due 2026	62			62
	7.85% debentures due 2026	100			100
	6.95% debentures due 2027	300			300
	7.375% debentures due 2032	1,250			1,250
	6.875% debentures due 2033	275			275
	Industrial revenue bonds, rates from 6.7% to 6.8%, due 2022	88			88
	Other	1			1
		4,896			4,896
	Less unamortized discounts	(5		)	(5		)
	Total	$	4,891		$	4,891
	Portion due within one year	$	—		$	—
Amounts of Long-Term Debt Due Annually for the Next Five Years and the Total Amount Due After 2019	Amounts of Long-Term Debt Due Annually for the Next Five Years and the Total Amount Due After 2019
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31, 2014
	Long-term debt maturities:
	2015	$	—
	2016	$	—
	2017	$	281
	2018	$	62
	2019	$	500
	Thereafter	$	4,053

FAIR_VALUE_OF_FINANCIAL_INSTRU1

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Estimated fair values and carrying values of our long-term debt	The estimated fair values and carrying values of our long-term debt consisted of the following:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31, 2014				DECEMBER 31, 2013
		CARRYING		FAIR VALUE		CARRYING		FAIR VALUE
		VALUE		(LEVEL 2)		VALUE		(LEVEL 2)
	Long-term debt (including current maturities)	$	4,891	$	5,922	$	4,891	$	5,683

LEGAL_PROCEEDINGS_COMMITMENTS_1

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2014
Loss Contingencies [Line Items]
Changes in the Reserve for Environmental Remediation	Changes in the Reserve for Environmental Remediation
	DOLLAR AMOUNTS IN MILLIONS
	Reserve balance as of December 31, 2013	$	30
	Reserve charges and adjustments, net	4
	Payments	(5		)
	Reserve balance as of December 31, 2014	$	29
	Total active sites as of December 31, 2014	49
Changes in the Reserve for Asset Retirement Obligations	Changes in the Reserve for Asset Retirement Obligations
	DOLLAR AMOUNTS IN MILLIONS
	Reserve balance as of December 31, 2013	$	54
	Reserve charges and adjustments, net	10
	Payments	(10		)
	Other adjustments(1)	(14		)
	Reserve balance as of December 31, 2014	$	40
	(1) Primarily related to the sale of a landfill in Washington State.
Our purchase obligations	Our purchase obligations as of December 31, 2014 were:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31, 2014
	2015	$	35
	2016	$	16
	2017	$	6
	2018	$	6
	2019	$	2
	Thereafter	$	7
Our rent expense	Our rent expense was:
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013		2012
	Rent expense	$	32		$	38	$	36
Our operating lease commitments	Our operating lease commitments as of December 31, 2014 were:
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31, 2014
	2015	$	28
	2016	$	21
	2017	$	20
	2018	$	16
	2019	$	12
	Thereafter	$	107

SHAREHOLDERS_INTEREST_Tables

SHAREHOLDERS' INTEREST (Tables)	12 Months Ended
	Dec. 31, 2014
Reconciliation of Our Common Share Activity	Reconciliation of Our Common Share Activity
	IN THOUSANDS
		2014		2013		2012
	Outstanding at beginning of year	583,548		542,393		536,425
	New issuance (Note 4)	—		33,350		—
	Shares tendered (Note 3)	(58,813	)	—		—
	Stock options exercised	5,134		7,209		5,404
	Issued for restricted stock units	451		462		523
	Issued for performance shares	217		134		—
	Issued for Directors' stock-equivalent units	—		—		41
	Repurchased	(6,063	)	—		—
	Outstanding at end of year	524,474		583,548		542,393
Changes in amounts included in our cumulative other comprehensive income (loss) by component	Changes in amounts included in our cumulative other comprehensive income (loss) by component are:
	DOLLAR AMOUNTS IN MILLIONS
					PENSION						OTHER POSTRETIREMENT BENEFITS
		Foreign currency translation adjustments			Actuarial losses			Prior service costs			Actuarial losses			Prior service credits			Unrealized gains on available-for-sale securities		Total
	Beginning balance as of December 31, 2012	$	413		$	(1,942	)	$	(23	)	$	(137	)	$	127		$	4	$	(1,558	)
	Other comprehensive income (loss) before reclassifications	(59		)	1,123			—			24			66			2		1,156
	Income taxes	—			(394		)	—			(7		)	(27		)	—		(428		)
	Net other comprehensive income (loss) before reclassifications	(59		)	729			—			17			39			2		728
	Amounts reclassified from cumulative other comprehensive income (loss)(1)	—			221			7			14			(23		)	—		219
	Income taxes	—			(74		)	(3		)	(5		)	7			—		(75		)
	Net amounts reclassified from cumulative other comprehensive income (loss)	—			147			4			9			(16		)	—		144
	Total other comprehensive income (loss)	(59		)	876			4			26			23			2		872
	Beginning balance as of December 31, 2013	354			(1,066		)	(19		)	(111		)	150			6		(686		)
	Other comprehensive income (loss) before reclassifications	(50		)	(1,008		)	1			(6		)	(12		)	—		(1,075		)
	Income taxes	—			369			—			1			7			—		377
	Net other comprehensive income (loss) before reclassifications	(50		)	(639		)	1			(5		)	(5		)	—		(698		)
	Amounts reclassified from cumulative other comprehensive income (loss)(1)	—			125			5			12			(161		)	—		(19		)
	Income taxes	—			(43		)	(2		)	(4		)	59			—		10
	Net amounts reclassified from cumulative other comprehensive income (loss)	—			82			3			8			(102		)	—		(9		)
	Total other comprehensive income (loss)	(50		)	(557		)	4			3			(107		)	—		(707		)
	Ending balance as of December 31, 2014	$	304		$	(1,623	)	$	(15	)	$	(108	)	$	43		$	6	$	(1,393	)
	(1) Actuarial losses and prior service credits (costs) are included in the computation of net periodic benefit costs (credits). See Note: 9 Pension and Other Postretirement Benefit Plans.

SHAREBASED_COMPENSATION_Tables

SHARE-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2014
Weighted Average Assumptions Used in Estimating Value of Stock Options Granted	Weighted Average Assumptions Used in Estimating Value of Stock Options Granted
		2014			2013			2012
		GRANTS			GRANTS			GRANTS
	Expected volatility	31.71		%	38		%	40.41		%
	Expected dividends	2.92		%	2.23		%	2.94		%
	Expected term (in years)	4.97			4.97			5.33
	Risk-free rate	1.57		%	0.92		%	1.01		%
	Weighted average grant-date fair value	$	6.62		$	8.4		$	5.72
Schedule of Stock Options Activity	Activity
	The following table shows our option unit activity for 2014.
		OPTIONS	WEIGHTED			WEIGHTED	AGGREGATE
		(IN	AVERAGE			AVERAGE	INTRINSIC
		THOUSANDS)	EXERCISE			REMAINING	VALUE (IN
			PRICE			CONTRACTUAL	MILLIONS)
						TERM
						(IN YEARS)
	Outstanding at December 31, 2013	17,055	$	23.12
	Granted	2,463	$	30.14
	Exercised	-5,294	$	22.5
	Forfeited or expired(1)	-1,939	$	26.98
	Outstanding at December 31, 2014(2)	12,285	$	24.19		5.27	$	144
	Exercisable at December 31, 2014	8,267	$	22.32		3.81	$	112
	(1) Approximately 1,601 thousand stock options were cancelled as a result of the Real Estate Divestiture. See Note 3: Discontinued Operations for more information.
	(2) As of December 31, 2014, there were approximately 998 thousand stock options that had met the requisite service period and will be released as identified in the grant terms.
Schedule of Restricted Stock Units Award Activity	Activity
	The following table shows our restricted stock unit activity for 2014.
		STOCK UNITS	WEIGHTED
		(IN THOUSANDS)	AVERAGE
			GRANT-DATE
			FAIR VALUE
	Nonvested at December 31, 2013	1,547	$	25.83
	Granted	686	$	30.14
	Vested	-628	$	24.94
	Forfeited(1)	-378	$	27.9
	Nonvested at December 31, 2014(2)	1,227	$	28.06
	(1) Approximately 280 thousand restricted stock units were cancelled as a result of the Real Estate Divestiture. See Note 3: Discontinued Operations for more information.
	(2) As of December 31, 2014, there were approximately 212 thousand restricted stock units that had met the requisite service period and will be released as identified in the grant terms.
Weighted Average Assumptions Used in Estimating the Value of Performance Share Units	Weighted Average Assumptions Used in Estimating the Value of Performance Share Units
		2014			2013			2012
		GRANTS			GRANTS			GRANTS
	Performance period	1/1/2014 – 12/31/2015			1/1/2013 – 12/31/2014			1/1/2012 – 12/31/2013
	Valuation date closing stock price	$	30.16		$	30.48		$	20.56
	Expected dividends	2.91		%	2.23		%	2.92		%
	Risk-free rate	0.03% - 0.79%			0.09% - 0.46%			0.08% - 0.32%
	Volatility	20.74% - 23.53%			22.09% - 29.57%			34.66% - 34.86%
	Weighted average grant-date fair value	$	30.62		$	31.59		$	21.71
Schedule of Performance Share Units Activity	Activity
	The following table shows our performance share unit activity for 2014.
		GRANTS (IN		WEIGHTED
		THOUSANDS)		AVERAGE
				GRANT-DATE
				FAIR VALUE
	Nonvested at December 31, 2013	1,102		$	26.83
	Granted at target	321		$	30.62
	Vested	(311	)	$	23.32
	Forfeited(1)	(206	)	$	26.07
	Performance adjustment	(16	)	$	31.15
	Nonvested at December 31, 2014(2)	890		$	29.46
	(1) Approximately 44 thousand performance share units were cancelled as a result of the Real Estate Divestiture. See Note 3: Discontinued Operations for more information.
	(2) As of December 31, 2014, there were approximately 393 thousand performance share units that had met the requisite service period and will be released as identified in the grant terms.
Weighted Average Assumptions Used to Re-measure Value of Stock Appreciation Rights	Weighted Average Assumptions Used to Re-measure Value of Stock Appreciation Rights at Year-End
		2014			2013			2012
		GRANTS			GRANTS			GRANTS
	Expected volatility	18.2		%	24.02		%	29.07		%
	Expected dividends	3.21		%	2.81		%	2.44		%
	Expected term (in years)	1.32			1.16			1.71
	Risk-free rate	0.45		%	0.19		%	0.27		%
	Weighted average fair value	$	12.7		$	8.68		$	7.25
Schedule of Stock Appreciation Rights Activity	Activity
	The following table shows our stock appreciation rights activity for 2014.
		RIGHTS		WEIGHTED			AVERAGE	AGGREGATE
		(IN		AVERAGE			REMAINING	INTRINSIC
		THOUSANDS)		EXERCISE			CONTRACTUAL	VALUE (IN
				PRICE			TERM	MILLIONS)
							(IN YEARS)
	Outstanding at December 31, 2013	695		$	22.96
	Granted	74		$	30.16
	Exercised	(322	)	$	24.21
	Forfeited or expired	(30	)	$	28.8
	Outstanding at December 31, 2014	417		$	22.85		4.44	$	5
	Exercisable at December 31, 2014	327		$	21.7		3.39	$	5

CHARGES_FOR_RESTRUCTURING_CLOS1

CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Items Included in Our Restructuring, Closure and Asset Impairment Charges	Items Included in Our Restructuring, Closure and Asset Impairment Charges
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013		2012
	Restructuring and closure charges:
	Termination benefits	$	27		$	1	$	—
	Pension and postretirement charges	3			—		—
	Other restructuring and closure costs	12			4		6
	Charges for restructuring and closures	42			5		6
	Impairment of long-lived assets	2			372		20
	Total charges for restructuring, closures and impairments	$	44		$	377	$	26
Changes in accrued severance related to restructuring	Changes in accrued severance related to restructuring during 2014 were as follows:
	DOLLAR AMOUNTS IN MILLIONS
	Accrued severance as of December 31, 2013	$	2
	Charges	27
	Payments	(19		)
	Accrued severance as of December 31, 2014	$	10

OTHER_OPERATING_INCOME_NET_Tab

OTHER OPERATING INCOME, NET (Tables)	12 Months Ended
	Dec. 31, 2014
Various Income and Expense Items Included in Other Operating Income, Net	Various Income and Expense Items Included in Other Operating Income, Net
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Gain on postretirement plan amendment (Note 9)	$	(151	)	$	—		$	(103	)
	Gain on disposition of non-strategic assets	(27		)	(19		)	(28		)
	Foreign exchange (gains) losses, net	27			7			(6		)
	Land management income	(34		)	(28		)	(27		)
	Litigation expense, net	9			16			12
	Other, net	(25		)	(11		)	(26		)
	Total	$	(201	)	$	(35	)	$	(178	)

INCOME_TAXES_Tables

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2014
Domestic and Foreign Earnings (Loss) From Continuing Operations Before Income Taxes	Domestic and Foreign Earnings (Loss) From Continuing Operations Before Income Taxes
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Domestic earnings	$	970		$	198		$	333
	Foreign earnings (loss)	43			122			(11		)
	Total	$	1,013		$	320		$	322
Provision (Benefit) for Income Taxes From Continuing Operations	Provision (Benefit) for Income Taxes From Continuing Operations
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	Current:
	Federal	$	(26	)	$	(80	)	$	(78	)
	State	12			(18		)	(11		)
	Foreign	3			(21		)	26
		(11		)	(119		)	(63		)
	Deferred:
	Federal	178			(79		)	6
	State	6			6			1
	Foreign	12			21			66
		196			(52		)	73
	Total income tax provision (benefit)	$	185		$	(171	)	$	10
Effective Income Tax Rate Applicable to Continuing Operations	Effective Income Tax Rate Applicable to Continuing Operations
	DOLLAR AMOUNTS IN MILLIONS
		2014			2013			2012
	U.S. federal statutory income tax	$	354		$	112		$	113
	State income taxes, net of federal tax benefit	14			7			3
	REIT income not subject to federal income tax	(161		)	(101		)	(94		)
	Foreign taxes	(2		)	(8		)	8
	Provision for unrecognized tax benefits	(4		)	(193		)	(6		)
	Repatriation of Canadian earnings	—			21			—
	State income tax settlement	—			—			(10		)
	Domestic production activities deduction	—			(13		)	—
	Other, net	(16		)	4			(4		)
	Total income tax provision (benefit)	$	185		$	(171	)	$	10
	Effective income tax rate	18.3		%	(53.4		)%	3.1		%
Balance Sheet Classification of Deferred Income Tax Assets (Liabilities) Related to Continuing Operations	Balance Sheet Classification of Deferred Income Tax Assets (Liabilities) Related to Continuing Operations
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Net current deferred tax asset	$	228		$	130
	Net noncurrent deferred tax asset	8			5
	Net noncurrent deferred tax liability	(206		)	(285		)
	Net deferred tax asset (liability)	$	30		$	(150	)
Items included in Our Deferred Income Tax Assets (Liabilities)	Items Included in Our Deferred Income Tax Assets (Liabilities)
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Postretirement benefits	$	101		$	102
	Pension	369			57
	Real estate impairments	—			121
	State tax credits	56			59
	Net operating loss carryforwards	86			110
	Cellulosic biofuel producers credit	100			80
	Other	223			260
	Gross deferred tax assets	935			789
	Valuation allowance	(72		)	(89		)
	Net deferred tax assets	863			700
	Property, plant and equipment	(523		)	(540		)
	Timber installment notes	(180		)	(180		)
	Other	(130		)	(130		)
	Deferred tax liabilities	(833		)	(850		)
	Net deferred tax asset (liability)	$	30		$	(150	)
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits	Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits
	DOLLAR AMOUNTS IN MILLIONS
		DECEMBER 31,			DECEMBER 31,
		2014			2013
	Balance at beginning of year	$	26		$	177
	Reductions for tax positions of prior years	—			(148		)
	Lapse of statute	(15		)	(3		)
	Balance at end of year	$	11		$	26

GEOGRAPHIC_AREAS_Tables

GEOGRAPHIC AREAS (Tables)	12 Months Ended
	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales by Geographic Area	Sales by Geographic Area
	FOR THE THREE-YEAR PERIOD ENDED DECEMBER 31, 2014
	(DOLLAR AMOUNTS IN MILLIONS)
		2014		2013		2012
	Sales to unaffiliated customers:
	U.S.	$	4,889	$	4,761	$	3,867
	Japan	682		758		639
	Europe	328		298		300
	China	477		453		360
	Canada	424		418		302
	South America	87		80		74
	Other foreign countries	516		486		447
	Total	$	7,403	$	7,254	$	5,989
	Export sales from the U.S.:
	Japan	$	620	$	676	$	583
	China	416		411		329
	Other	856		804		770
	Total	$	1,892	$	1,891	$	1,682
Long-Lived Assets by Geographic Area	Long-Lived Assets by Geographic Area
	DOLLAR AMOUNTS IN MILLIONS
		December 31,		December 31,		December 31,
		2014		2013		2012
	Long-lived assets:
	U.S.(1)	$	8,069	$	8,116	$	5,523
	Canada	579		652		728
	Other foreign countries	676		670		672
	Total	$	9,324	$	9,438	$	6,923
	(1) Includes assets of discontinued operations in 2013 and 2012.

SELECTED_QUARTERLY_FINANCIAL_I1

SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited) (Table)	12 Months Ended
	Dec. 31, 2014
Key Quarterly Financial Data for the Last Two Years	Key Quarterly Financial Data for the Last Two Years
	DOLLAR AMOUNTS IN MILLIONS EXCEPT PER-SHARE FIGURES
		First		Second		Third		Fourth			Full Year
		Quarter		Quarter		Quarter(1)		Quarter(2)
	2014:00:00
	Net sales	$	1,736	$	1,964	$	1,915	$	1,788		$	7,403
	Operating income	$	308	$	400	$	318	$	294		$	1,320
	Earnings from continuing operations before income taxes	$	234	$	328	$	237	$	214		$	1,013
	Net earnings	$	194	$	291	$	1,164	$	177		$	1,826
	Net earnings attributable to Weyerhaeuser common shareholders	$	183	$	280	$	1,153	$	166		$	1,782
	Basic net earnings per share attributable to Weyerhaeuser common shareholders	$	0.31	$	0.48	$	2.17	$	0.32		$	3.2
	Diluted net earnings per share attributable to Weyerhaeuser common shareholders	$	0.31	$	0.47	$	2.15	$	0.31		$	3.18
	Dividends paid per share	$	0.22	$	0.22	$	0.29	$	0.29		$	1.02
	Market prices - high/low	$31.59 - $28.63		$33.26 - $27.48		$34.60 - $31.09		$36.88 - $31.61			$36.88 - $27.48
	2013:00:00
	Net sales	$	1,755	$	1,874	$	1,857	$	1,768		$	7,254
	Operating income (loss)	$	253	$	293	$	243	$	(155	)	$	634
	Earnings (loss) from continuing operations before income taxes	$	181	$	221	$	170	$	(252	)	$	320
	Net earnings	$	144	$	198	$	167	$	54		$	563
	Net earnings attributable to Weyerhaeuser common shareholders	$	144	$	196	$	157	$	43		$	540
	Basic net earnings per share attributable to Weyerhaeuser common shareholders	$	0.26	$	0.35	$	0.27	$	0.07		$	0.95
	Diluted net earnings per share attributable to Weyerhaeuser common shareholders	$	0.26	$	0.35	$	0.27	$	0.07		$	0.95
	Dividends paid per share	$	0.17	$	0.2	$	0.22	$	0.22		$	0.81
	Market prices - high/low	$31.74 - $28.36		$33.24 - $26.38		$29.86 - $26.64		$32.00 - $28.01			$33.24 - $26.38
	(1) Third Quarter 2014 includes a $972 million net gain on the Real Estate Divestiture recognized in 2014. See Note 3: Discontinued Operations for more information.
	(2) Fourth Quarter 2013 includes a $356 million noncash impairment charge. See Note 18: Charges for Restructuring, Closures and Asset Impairments for more information.

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Rate
Negative book cash balances	$0	$0
Accounts receivable balance, one customer	13.00%

BUSINESS_SEGMENTS_Sales_and_Co

BUSINESS SEGMENTS - Sales and Contribution (Charge) to Earnings (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	$7,403	$7,254	$5,989
Contribution (charge) to earnings from continuing operations	2,374	805	788
Continuing operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Contribution (charge) to earnings from continuing operations	1,357	689	667
Operating segments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	1,497	1,343	1,077
Contribution (charge) to earnings from continuing operations	613	470	322
Operating segments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	3,970	4,009	3,058
Contribution (charge) to earnings from continuing operations	327	441	120
Operating segments | Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	1,936	1,902	1,854
Contribution (charge) to earnings from continuing operations	291	200	223
Operating intersegments
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	0	0	0
Operating intersegments | Timberlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	867	799	683
Operating intersegments | Wood Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	80	71	74
Operating intersegments | Cellulose Fibers
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	0	0	0
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	-947	-870	-757
Unallocated Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to unaffiliated customers	0	0	0
Contribution (charge) to earnings from continuing operations	$126	($422)	$2

BUSINESS_SEGMENTS_Reconciliati

BUSINESS SEGMENTS - Reconciliation of Contribution to Earnings to Net Earnings Attributable to Weyerhaeuser (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Contribution (Charge) to Earnings From Segment to Net Earnings [Line Items]
Net contribution to earnings	$2,374	$805	$788
Interest expense, net of capitalized interest (continuing and discontinued operations)	347	371	348
Income before income taxes (continuing and discontinued operations)	2,027	434	440
Income taxes (continuing and discontinued operations)	-201	129	-55
Net earnings attributable to Weyerhaeuser	1,826	563	385
Continuing operations
Reconciliation of Contribution (Charge) to Earnings From Segment to Net Earnings [Line Items]
Net contribution to earnings	1,357	689	667
Discontinued operations
Reconciliation of Contribution (Charge) to Earnings From Segment to Net Earnings [Line Items]
Net contribution to earnings	$1,017	$116	$121

BUSINESS_SEGMENTS_Additional_F

BUSINESS SEGMENTS - Additional Financial Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation, depletion and amortization	$493	$458	$444
Net pension and postretirement cost (credit)(1)	0	96	76
Charges for restructuring, closures and impairments(2)	44	377	26
Equity in income (loss) of equity affiliates and unconsolidated entities	-2	11	2
Capital expenditures	391	283	281
Investments in and advances to equity affiliates and unconsolidated entities	188	190	192
Total assets(3)(4)	13,457	14,577	12,592
Operating segments | Timberlands
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation, depletion and amortization	207	166	142
Net pension and postretirement cost (credit)(1)	10	10	8
Charges for restructuring, closures and impairments(2)	1	2	2
Equity in income (loss) of equity affiliates and unconsolidated entities	0	0	0
Capital expenditures	74	73	60
Investments in and advances to equity affiliates and unconsolidated entities	0	0	0
Total assets(3)(4)	7,327	7,578	4,697
Operating segments | Wood Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation, depletion and amortization	119	123	133
Net pension and postretirement cost (credit)(1)	24	28	25
Charges for restructuring, closures and impairments(2)	2	13	6
Equity in income (loss) of equity affiliates and unconsolidated entities	0	0	0
Capital expenditures	190	113	56
Investments in and advances to equity affiliates and unconsolidated entities	0	0	0
Total assets(3)(4)	1,430	1,326	1,319
Operating segments | Cellulose Fibers
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation, depletion and amortization	155	156	150
Net pension and postretirement cost (credit)(1)	11	18	14
Charges for restructuring, closures and impairments(2)	0	0	0
Equity in income (loss) of equity affiliates and unconsolidated entities	-1	3	5
Capital expenditures	123	92	160
Investments in and advances to equity affiliates and unconsolidated entities	188	190	191
Total assets(3)(4)	2,214	2,299	2,386
Unallocated Items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation, depletion and amortization	12	13	19
Net pension and postretirement cost (credit)(1)	-45	40	29
Charges for restructuring, closures and impairments(2)	41	362	18
Equity in income (loss) of equity affiliates and unconsolidated entities	-1	8	-3
Capital expenditures	4	5	5
Investments in and advances to equity affiliates and unconsolidated entities	0	0	1
Total assets(3)(4)	$2,486	$3,374	$4,190

DISCONTINUED_OPERATIONS_Compon

DISCONTINUED OPERATIONS - Components of the net gain on divestiture (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common shares tendered (58,813,151 shares at $33.22 per share)		$1,954	$0	$0
Cash		707	0	0
Gain on WRECO divestiture		972	0	0
Common stock in exchange for the distribution of shares of Weyerhaeuser Real Estate Company (WRECO) to our shareholders	-58,813,151	-58,813,151	0	0
Share price of common shares tendered		$33.22
Real Estate Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common shares tendered (58,813,151 shares at $33.22 per share)		1,954
Cash	707	707
Proceeds		2,661
Net book value of contributed assets		1,671
Transaction costs, net of reimbursement		18
Net book value of contributed assets and transaction costs, net of reimbursement		1,689
Gain on WRECO divestiture	972	$972

DISCONTINUED_OPERATIONS_Sales_

DISCONTINUED OPERATIONS - Sales and Net Earnings from Discontinued Operations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales from discontinued operations	$573	$1,275	$1,070
Income from discontinued operations	42	114	117
Income taxes	-16	-42	-45
Net income from operations	26	72	72
Net gain on divestiture	972	0	0
Net earnings from discontinued operations	$998	$72	$72

DISCONTINUED_OPERATIONS_Carryi

DISCONTINUED OPERATIONS - Carrying Value of Assets and Liabilities of Discontinued Operations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets
Cash and cash equivalents		$5
Receivables, less discounts and allowances		51
Prepaid expenses		11
Deferred tax assets		21
Total current assets	0	88
Property and equipment, net		15
Real estate in process of development and for sale		851
Land being processed for development		596
Investments in and advances to equity affiliates		21
Deferred tax assets		115
Other assets		96
Total noncurrent assets	0	1,694
Total assets		1,782
Liabilities
Accounts payable		41
Accrued liabilities		113
Total current liabilities	0	154
Long-term debt (nonrecourse to the company) held by variable interest entities		5
Other liabilities		27
Total noncurrent liabilities	0	32
Total liabilities		186
Noncontrolling interests	$0	$34

DISCONTINUED_OPERATIONS_Additi

DISCONTINUED OPERATIONS - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock in exchange for the distribution of shares of Weyerhaeuser Real Estate Company (WRECO) to our shareholders	58,813,151	58,813,151	0	0
Cash		$707	$0	$0
Share price of common shares tendered		$33.22
Net gain on divestiture		972	0	0
Real Estate Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of disposition	7-Jul-14
Unsecured and unsubordinated senior debt obligations issued by WRECO					900
Net proceeds from issuance of debt	870
Proceeds utilized by WRECO to repay intercompany debt and interest to Weyerhaeuser Company	744
Cash on hand	5
Adjustment amount payable pursuant to the terms of the transaction agreement	32
Cash	707	707
Net gain on divestiture	972	$972

LONGVIEW_TIMBER_PURCHASE_Summa

LONGVIEW TIMBER PURCHASE - Summarized unaudited pro forma information (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Net sales	$7,371	$6,166
Net earnings from continuing operations attributable to Weyerhaeuser common shareholders	$485	$276
Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, basic	$0.84	$0.48
Net earnings from continuing operations per share attributable to Weyerhaeuser common shareholders, diluted	$0.83	$0.47

LONGVIEW_TIMBER_PURCHASE_Estim

LONGVIEW TIMBER PURCHASE - Estimated fair values of identifiable assets acquired and liabilities assumed (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jul. 23, 2013
In Millions, unless otherwise specified
Business Acquisition [Line Items]
Timber and timberlands	$6,530	$6,580
Previously Reported
Business Acquisition [Line Items]
Current assets			46
Property and equipment			39
Timber and timberlands			2,654
Other assets			2
Total assets acquired			2,741
Current liabilities			10
Long-term debt			1,122
Other liabilities			5
Total liabilities assumed			1,137
Net assets acquired			1,604
Measurement Period Adjustments
Business Acquisition [Line Items]
Current assets		0
Property and equipment		1
Timber and timberlands		2
Other assets		0
Total assets acquired		3
Current liabilities		0
Long-term debt		0
Other liabilities		3
Total liabilities assumed		3
Net assets acquired		0
Final
Business Acquisition [Line Items]
Current assets		46
Property and equipment		40
Timber and timberlands		2,656
Other assets		2
Total assets acquired		2,744
Current liabilities		10
Long-term debt		1,122
Other liabilities		8
Total liabilities assumed		1,140
Net assets acquired		$1,604

LONGVIEW_TIMBER_PURCHASE_Addit

LONGVIEW TIMBER PURCHASE - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Jul. 23, 2013
						acre
						Rate
Business Acquisition [Line Items]
Acquisition of Longview Timber LLC, effective date of acquisition	23-Jul-13
Acquisition of Longview Timber LLC, equity interests purchased						100.00%
Acquisition of Longview Timber LLC, net of cash acquired	$1,580,000,000	$0	$1,581,000,000	$0
Acquisition of Longview Timber LLC, debt assumed	1,070,000,000	0	1,070,000,000	0
Acquisition of Longview Timber LLC, aggregate purchase price	2,650,000,000
Acquisition of Longview Timber LLC, timberlands acquired, acres						645,000
New shares issued		0	33,350	0
Net proceeds from issuance of common shares		0	897,000,000	0
Fees related to bridge loan			11,000,000
Common shares
Business Acquisition [Line Items]
New shares issued	4,400				29,000
New shares issued, date	8-Jul-13				24-Jun-13
Valuation date closing stock price	$27.75				$27.75
Net proceeds from issuance of common shares	116,000,000				781,000,000
6.375 percent Mandatory Convertible Preference Shares, Series A
Business Acquisition [Line Items]
New shares issued					13,800
New shares issued, date					24-Jun-13
Preference shares, par value		$1	$1		$1
Preference shares, liquidation preference		$50	$50		$50
Net proceeds from issuance of preference shares					$669,000,000

NET_EARNINGS_PER_SHARE_Potenti

NET EARNINGS PER SHARE - Potential Shares Not Included in the Computation of Diluted Earnings Per Share (Details)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares not included in the computation of diluted earnings per share	0	4,618	3,519
Preference Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares not included in the computation of diluted earnings per share	24,988	24,865	0

NET_EARNINGS_PER_SHARE_Additio

NET EARNINGS PER SHARE - Additional Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic earnings per share attributable to Weyerhaeuser common shareholders	$0.32	$2.17	$0.48	$0.31	$0.07	$0.27	$0.35	$0.26	$3.20	$0.95	$0.71
Diluted earnings per share attributable to Weyerhaeuser common shareholders	$0.31	$2.15	$0.47	$0.31	$0.07	$0.27	$0.35	$0.26	$3.18	$0.95	$0.71
New shares issued									0	33,350	0
6.375 percent Mandatory Convertible Preference Shares, Series A
New shares issued							13,800
New shares issued, date							24-Jun-13

INVENTORIES_Inventories_as_of_

INVENTORIES - Inventories as of the End of Our Last Two Years (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory [Line Items]
Total	$595	$542
Logs and chips
Inventory [Line Items]
LIFO inventories	9	15
FIFO or moving average cost inventories	38	33
Lumber, plywood and panels
Inventory [Line Items]
LIFO inventories	55	46
Lumber, plywood, panels and engineered wood products
Inventory [Line Items]
FIFO or moving average cost inventories	80	70
Pulp and paperboard
Inventory [Line Items]
LIFO inventories	122	97
FIFO or moving average cost inventories	35	30
Other products
Inventory [Line Items]
LIFO inventories	11	11
FIFO or moving average cost inventories	96	94
Materials and supplies
Inventory [Line Items]
FIFO or moving average cost inventories	$149	$146

INVENTORIES_Additional_Informa

INVENTORIES - Additional Information (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory [Line Items]
Increase in inventory amount if FIFO would have been used	$120	$112

PROPERTY_AND_EQUIPMENT_Carryin

PROPERTY AND EQUIPMENT - Carrying Value of Property and Equipment and Estimated Service Lives (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Land	127	$129
Buildings and improvements	1,220	1,262
Machinery and equipment	6,706	6,712
Roads	609	594
Other	285	319
Total cost	8,947	9,016
Allowance for depreciation and amortization	-6,324	-6,327
Property and equipment, net	2,623	$2,689
Minimum | Buildings and Improvements
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years
Minimum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Estimated service lives	2 years
Minimum | Roads
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years
Minimum | Other
Property, Plant and Equipment [Line Items]
Estimated service lives	3 years
Maximum | Buildings and Improvements
Property, Plant and Equipment [Line Items]
Estimated service lives	40 years
Maximum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Estimated service lives	25 years
Maximum | Roads
Property, Plant and Equipment [Line Items]
Estimated service lives	20 years
Maximum | Other
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years

PROPERTY_AND_EQUIPMENT_Additio

PROPERTY AND EQUIPMENT - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation expense, excluding discontinued operations	$332	$332	$332
Buildings and Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated service lives	10 years
Buildings and Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated service lives	40 years
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated service lives	2 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated service lives	25 years
Timberlands | Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated service lives	15 years
Wood products manufacturing facilities | Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated service lives	20 years
Pulp mills | Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated service lives	25 years

EQUITY_AFFILIATES_Assets_and_L

EQUITY AFFILIATES - Assets and Liabilities of Equity Affiliates (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Equity Method Investments [Line Items]
Current assets	$123	$119
Noncurrent assets	413	468
Current liabilities	30	44
Noncurrent liabilities	$109	$141

EQUITY_AFFILIATES_Operating_Re

EQUITY AFFILIATES - Operating Results of Equity Affiliates (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Net sales	$501	$534	$553
Operating income (loss)	-2	3	3
Net income (loss)	$0	$3	($7)

EQUITY_AFFILIATES_Additional_I

EQUITY AFFILIATES - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
North Pacific Paper Corporation (NORPAC)
Schedule of Equity Method Investments [Line Items]
Equity affiliate, ownership	50.00%
Amounts paid to Weyerhaeuser by NORPAC for goods and services	$195,000,000	$203,000,000	$221,000,000
Payable balance to equity affiliate	75,000,000	93,000,000
Catchlight Energy
Schedule of Equity Method Investments [Line Items]
Equity affiliate, proceeds from dissolution	0
Liaison Technologies Inc
Schedule of Equity Method Investments [Line Items]
Pretax gain on partial sale of equity affiliate investment		$10,000,000

PENSION_AND_OTHER_POSTRETIREME2

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes in Projected Benefit Obligations of Our Pension and Other Postretirement Benefit Plans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning	$5,834	$6,575
Service cost	53	64	53
Interest cost	271	244	262
Plan participants’ contributions	0	0
Actuarial (gains) losses	1,006	-666
Foreign currency exchange rate changes	-87	-66
Benefits paid (includes lump sum settlements)	-391	-317
Plan amendments and other	1	0
Special/contractual termination benefits	7	0
Plan transfer/Acquisitions	4	0
Projected benefit obligation, ending	6,698	5,834	6,575
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning	321	433
Service cost	1	1	1
Interest cost	10	12	15
Plan participants’ contributions	13	16
Actuarial (gains) losses	4	-23
Foreign currency exchange rate changes	-7	-5
Benefits paid (includes lump sum settlements)	-44	-50
Plan amendments and other	2	-66
Special/contractual termination benefits	0	0
Plan transfer/Acquisitions	3	3
Projected benefit obligation, ending	$303	$321	$433

PENSION_AND_OTHER_POSTRETIREME3

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes in Fair Value of Plan Assets (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	$368	$808	$490
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	5,614	5,022
Adjustment for final fair value of plan assets	53	55		53
Actual return on plan assets	368	808
Foreign currency exchange rate changes	-75	-57
Employer contributions and benefit payments	70	103
Plan participants’ contributions	0	0
Plan transfer/Acquisitions	4	0
Benefits paid (includes lump sum settlements)	-391	-317
Fair value of plan assets, ending	5,643	5,614
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	0	0
Adjustment for final fair value of plan assets	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions and benefit payments	31	34
Plan participants’ contributions	13	16
Plan transfer/Acquisitions	0	0
Benefits paid (includes lump sum settlements)	-44	-50
Fair value of plan assets, ending	$0	$0

PENSION_AND_OTHER_POSTRETIREME4

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Funded Status of Our Pension and Other Postretirement Benefit Plans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	($47)	($57)
Pension
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	8	35
Current liabilities	-21	-22
Noncurrent liabilities	-1,042	-233
Funded status	-1,055	-220
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	-26	-35
Noncurrent liabilities	-277	-283
Funded status	($303)	($318)

PENSION_AND_OTHER_POSTRETIREME5

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Assets Within Our Qualified and Registered Pension Plans (Details) (Qualified and Registered Pension Plans)	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	100.00%	100.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	12.20%	11.40%
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	60.60%	57.50%
Private equity and related funds
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	25.30%	28.60%
Real estate and related funds
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	1.40%	1.80%
Common and preferred stock and equity index instruments
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	0.70%	0.90%
Accrued liabilities
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	-0.20%	-0.20%

PENSION_AND_OTHER_POSTRETIREME6

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Assets Within Our Nonregisted Pension Plans (Details) (Non Registered Canadian Pension Plans)	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	100.00%	100.00%
Equities
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	52.80%	55.50%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Assets invested in pension plan, allocation percentage	47.20%	44.50%

PENSION_AND_OTHER_POSTRETIREME7

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Pension Trusts' Net Investments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$4,840	$4,935	$4,439
Fixed income instruments | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	3	4
Hedge funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,333	3,225	2,767
Private equity and related funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,422	1,606	1,577
Real estate and related funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	82	101	91
Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,630	5,600
Qualified and Registered Pension Plans | Fixed income instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	685	638
Qualified and Registered Pension Plans | Fixed income instruments | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	646	567
Qualified and Registered Pension Plans | Fixed income instruments | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36	68
Qualified and Registered Pension Plans | Fixed income instruments | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	3
Qualified and Registered Pension Plans | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,414	3,218
Qualified and Registered Pension Plans | Hedge funds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	103	0
Qualified and Registered Pension Plans | Hedge funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	-22	-7
Qualified and Registered Pension Plans | Hedge funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,333	3,225
Qualified and Registered Pension Plans | Private equity and related funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,425	1,604
Qualified and Registered Pension Plans | Private equity and related funds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Qualified and Registered Pension Plans | Private equity and related funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	-2
Qualified and Registered Pension Plans | Private equity and related funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,422	1,606
Qualified and Registered Pension Plans | Real estate and related funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	82	101
Qualified and Registered Pension Plans | Real estate and related funds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Qualified and Registered Pension Plans | Real estate and related funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Qualified and Registered Pension Plans | Real estate and related funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	82	101
Qualified and Registered Pension Plans | Common and preferred stock and equity index instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37	52
Qualified and Registered Pension Plans | Common and preferred stock and equity index instruments | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25	23
Qualified and Registered Pension Plans | Common and preferred stock and equity index instruments | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12	29
Qualified and Registered Pension Plans | Common and preferred stock and equity index instruments | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Qualified and Registered Pension Plans | Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,643	5,613
Qualified and Registered Pension Plans | Investments | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	774	590
Qualified and Registered Pension Plans | Investments | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29	88
Qualified and Registered Pension Plans | Investments | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,840	4,935
Qualified and Registered Pension Plans | Accrued liabilities, net
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	-13	-13
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	14
Non Registered Canadian Pension Plans | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	14
Non Registered Canadian Pension Plans | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non Registered Canadian Pension Plans | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non Registered Canadian Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	8
Non Registered Canadian Pension Plans | Cash | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	8
Non Registered Canadian Pension Plans | Cash | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non Registered Canadian Pension Plans | Cash | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non Registered Canadian Pension Plans | Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	6
Non Registered Canadian Pension Plans | Investments | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	6
Non Registered Canadian Pension Plans | Investments | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non Registered Canadian Pension Plans | Investments | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,643	5,614	5,022
Pension | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$4,800

PENSION_AND_OTHER_POSTRETIREME8

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Reconciliation of Pension Plan Assets (Details) (Fair Value, Inputs, Level 3, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	$4,935	$4,439
Net realized gains (losses)	322	235
Net change in unrealized appreciation (depreciation)	-58	435
Purchases	723	960
Sales	-927	-1,055
Issuances	52
Settlements	-132	-79
Transfers, Out(1)	-75
Fair value of plan assets, ending	4,840	4,935
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	3,225	2,767
Net realized gains (losses)	186	164
Net change in unrealized appreciation (depreciation)	76	275
Purchases	541	743
Sales	-540	-645
Issuances	52
Settlements	-132	-79
Transfers, Out(1)	-75
Fair value of plan assets, ending	3,333	3,225
Private equity and related funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	1,606	1,577
Net realized gains (losses)	128	90
Net change in unrealized appreciation (depreciation)	-130	138
Purchases	177	188
Sales	-359	-387
Issuances	0
Settlements	0	0
Transfers, Out(1)	0
Fair value of plan assets, ending	1,422	1,606
Real estate and related funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	101	91
Net realized gains (losses)	8	-19
Net change in unrealized appreciation (depreciation)	-4	23
Purchases	5	29
Sales	-28	-23
Issuances	0
Settlements	0	0
Transfers, Out(1)	0
Fair value of plan assets, ending	82	101
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	3	4
Net realized gains (losses)	0	0
Net change in unrealized appreciation (depreciation)	0	-1
Purchases	0	0
Sales	0	0
Issuances	0
Settlements	0	0
Transfers, Out(1)	0
Fair value of plan assets, ending	$3	$3

PENSION_AND_OTHER_POSTRETIREME9

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Fair Value of Derivatives (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Derivatives, Fair Value, Net	$417	$425
Equity index instruments
Defined Benefit Plan Disclosure [Line Items]
Derivatives, Fair Value, Net	13	29
Forward contracts
Defined Benefit Plan Disclosure [Line Items]
Derivatives, Fair Value, Net	-32	-9
Swaps
Defined Benefit Plan Disclosure [Line Items]
Derivatives, Fair Value, Net	$436	$405

Recovered_Sheet1

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Aggregate Notional Amount of Derivatives (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	$2,720	$2,605
Equity index instruments
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	361	399
Forward contracts
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	535	638
Swaps
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	$1,824	$1,568

Recovered_Sheet2

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Cost (Credit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)(2)(3)	($151)	$0	($103)
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	3	0	0
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	53	64	53
Interest cost	271	244	262
Expected return on plan assets	-467	-439	-422
Amortization of actuarial loss	125	221	175
Amortization of prior service cost (credit)(2)(3)	5	7	7
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	9	0	0
Other	0	0	0
Net periodic benefit cost (credit)	-4	97	75
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1
Interest cost	10	12	15
Expected return on plan assets	0	0	0
Amortization of actuarial loss	12	14	13
Amortization of prior service cost (credit)(2)(3)	-161	-23	-127
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	0	0	0
Other	-4	0	4
Net periodic benefit cost (credit)	-142	4	-94
Gain on postretirement plan amendment | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)(2)(3)	-151		-103
Real Estate Divestiture | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$2	$4	$3

Recovered_Sheet3

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Estimated Amortization from Cumulative Other Comprehensive Loss in 2015 (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$188
Prior service cost (credit)	-5
Net effect cost	183
Pension
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	178
Prior service cost (credit)	4
Net effect cost	182
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	10
Prior service cost (credit)	-9
Net effect cost	$1

Recovered_Sheet4

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Estimated Projected Benefit Payments for the Next 10 Years (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Pension
Defined Benefit Plan Disclosure [Line Items]
Expected Future Benefit Payments in 2015	$348
Expected Future Benefit Payments in 2016	354
Expected Future Benefit Payments in 2017	361
Expected Future Benefit Payments in 2018	370
Expected Future Benefit Payments in 2019	379
Expected Future Benefit Payments in 2020-2024	1,979
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected Future Benefit Payments in 2015	26
Expected Future Benefit Payments in 2016	25
Expected Future Benefit Payments in 2017	24
Expected Future Benefit Payments in 2018	23
Expected Future Benefit Payments in 2019	22
Expected Future Benefit Payments in 2020-2024	$98

Recovered_Sheet5

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.80%
United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	4.10%	4.90%
United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.60%	4.00%
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.90%	4.70%
Canadian Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.80%	4.60%
Pension
Defined Benefit Plan Disclosure [Line Items]
Election of lump sum or installment distributions (US salaried and nonqualified plans only)	60.00%	60.00%
Salaried | United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase, current year	2.50%	2.50%
Rate of compensation increase, thereafter	3.50%	3.50%
Salaried | Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase, current year	2.50%	2.50%
Rate of compensation increase, thereafter	3.50%	3.50%
Hourly | United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.00%	3.00%
Hourly | United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.00%	3.00%
Hourly | Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.25%	3.25%

Recovered_Sheet6

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Rates Used to Estimate Our Net Periodic Benefit Costs (Details)	6 Months Ended		12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%	4.90%	3.70%	4.50%
United States Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase, current year			2.50%	2.00%	2.50%
Rate of compensation increase, thereafter			3.50%	3.50%	3.50%
United States Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			3.00%	3.00%	3.00%
United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.00%	4.10%	4.00%
United States Other Postretirement Benefit Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			3.00%	3.00%	3.00%
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.10%	4.90%	4.70%
Canadian Pension Plans | Salaried
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase, current year			2.50%	2.10%	2.50%
Rate of compensation increase, thereafter			3.50%	3.50%	3.50%
Canadian Pension Plans | Hourly
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase			3.25%	3.25%	3.25%
Canadian Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.00%	4.80%	4.60%
Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets			9.00%	9.00%	9.00%
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets			3.50%	3.50%	3.50%
Pension
Defined Benefit Plan Disclosure [Line Items]
Election of lump sum distributions (U.S. salaried and nonqualified plans only)			56.00%	60.00%	60.00%

Recovered_Sheet7

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Actual Returns on Assets Held by Our Pension Trusts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	$368	$808	$490
Direct investments
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	258	568	324
Derivatives
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	$110	$240	$166

Recovered_Sheet8

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Assumptions We Use in Estimating Health Care Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
U.S.
Defined Benefit Plan Disclosure [Line Items]
Weighted health care cost trend rate assumed for next year	6.30%	6.40%
Rate to which cost trend rate is assumed to decline (ultimate trend rate)	4.50%	4.50%
Year that the rate reaches the ultimate trend rate	2029	2029
Canada
Defined Benefit Plan Disclosure [Line Items]
Weighted health care cost trend rate assumed for next year	5.60%	5.70%
Rate to which cost trend rate is assumed to decline (ultimate trend rate)	4.30%	4.30%
Year that the rate reaches the ultimate trend rate	2028	2028

Recovered_Sheet9

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Effect of a 1 Percent Change in Health Care Costs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Effect on total service and interest cost components on 1 percent increase in health care costs (less than)	$1
Effect on total service and interest cost components on 1 percent decrease in health care costs (less than)	-1
Effect on accumulated postretirement benefit obligation on 1 percent increase in health care costs	14
Effect on accumulated postretirement benefit obligation on 1 percent decrease in health care costs	($12)

Recovered_Sheet10

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended				3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Jul. 07, 2014
Defined Benefit Plan Disclosure [Line Items]
Types Of Plans We Sponsor		The plans we sponsor in the U.S. and Canada differ according to each country’s requirements.
		In the U.S., our pension plans are:
		•	qualified — plans that qualify under the Internal Revenue Code; and
		•	nonqualified — plans for select employees that provide additional benefits not qualified under the Internal Revenue Code.
		In Canada, our pension plans are:
		•	registered — plans that are registered under the Income Tax Act and applicable provincial pension acts; and
		•	nonregistered — plans for select employees that provide additional benefits that may not be registered under the Income Tax Act or provincial pension acts.
		We also offer retiree medical and life insurance plans in the U.S. and Canada. These plans are referred to as other postretirement benefit plans in the following disclosures.
Postretirement obligation increase	$45,000,000	$11,000,000
Amortization of prior service cost (credit)(2)(3)		-151,000,000		0	-103,000,000
Charge for curtailments and special termination benefits		-3,000,000		0	0
Discount rates	3.80%	3.80%
Total equity decreased for changes in cumulative other comprehensive loss		-698,000,000		728,000,000
Increase in pension plan liabilities		387,000,000
Pension plans with accumulated benefit obligations greater than plan assets, projected benefit obligations	6,600,000,000	6,600,000,000		971,000,000			971,000,000
Pension plans with accumulated benefit obligations greater than plan assets, accumulated benefit obligations	6,500,000,000	6,500,000,000		948,000,000			948,000,000
Pension plans with accumulated benefit obligations greater than plan assets, fair value of assets	5,600,000,000	5,600,000,000		726,000,000			726,000,000
Accumulated benefit obligation for all defined benefit pension plans	6,500,000,000	6,500,000,000		5,700,000,000			5,700,000,000
Retirement Compensation Arrangements		Retirement Compensation Arrangements fund a portion of our Canadian nonregistered pension plans.
		Under Retirement Compensation Arrangements, our contributions are split:
		•	50 percent to our investments in a portfolio of equities; and
		•	50 percent to a noninterest-bearing refundable tax account held by the Canada Revenue Agency — as required by Canadian tax rules.
		The Canadian tax rules requirement means that — on average, over time — approximately 50 percent of our Canadian nonregistered pension plans’ assets do not earn returns.
Actual return on plan assets		368,000,000		808,000,000	490,000,000
Number of employees covered under union-administered multiemployer pension plans		1,200
Multiemployer benefit plans contributions		4,000,000		4,000,000	4,000,000
Employer contributions to defined contribution plans		20,000,000		20,000,000	19,000,000
Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,630,000,000	5,630,000,000		5,600,000,000			5,600,000,000
Expected return on plan assets		9.00%		9.00%	9.00%
Actual return on plan assets		368,000,000
Pension
Defined Benefit Plan Disclosure [Line Items]
Benefit Plan Amendment							During fourth quarter 2013, we ratified an amendment to the Weyerhaeuser Pension Plan that closes the plan to newly hired and rehired salaried or non union employees effective January 1, 2014. Certain union employee groups adopted similar amendments effective at other dates. Beginning at the effective date, new hires and rehires into groups affected by these amendments will receive a company contribution for retirement in their 401(k) plan. The change was announced in December 2013.
							During fourth quarter 2013, we ratified amendments to the Weyerhaeuser Company Limited Retirement Plan for Non-Union Employees and the Retirement Plan for Non-Union Employees of Weyerhaeuser Company Limited at Grand Prairie, Alberta and Grande Cache, Alberta that (1) closes these plans to new hires and rehires effective January 1, 2014 and (2) changes the early retirement reduction for current employees enrolled in these plans, effective for future years of service beginning January 1, 2016. These changes were announced to participants in December 2013.
Amortization of prior service cost (credit)(2)(3)		5,000,000		7,000,000	7,000,000
Charge for curtailments and special termination benefits		-9,000,000		0	0
Increase in fair value of pension assets		53,000,000		55,000,000		53,000,000
Employer contributions and benefit payments		70,000,000		103,000,000
Fair value of plan assets	5,643,000,000	5,643,000,000		5,614,000,000	5,022,000,000		5,614,000,000
Percentage increase in fair value of pension assets						1.00%
Actual return on plan assets		368,000,000		808,000,000
Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments		43,000,000
Expected contribution to benefit plans during 2015		38,000,000
United States Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	4.10%	4.10%		4.90%			4.90%
Annual rate of return on assets over 30 years		14.60%
Annual rate of return on assets over the past 5 years		10.60%
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.90%	3.90%		4.70%			4.70%
Canadian Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.80%	3.80%		4.60%			4.60%
United States Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.60%	3.60%		4.00%			4.00%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit Plan Amendment	During fourth quarter 2014, the decision was ratified to reinstate or modify available options for U.S. and Canadian postretirement benefits for certain retirees. As a result, our postretirement obligation increased by $45 million.						During fourth quarter 2013, the decision was ratified to eliminate Company funding of the Post-Medicare Health Reimbursement Account (HRA) for certain salaried retirees after 2014. This change was communicated to affected retirees during January 2014. As a result, we recognized a pretax gain of $151 million in 2014 from this plan amendment.
Amortization of prior service cost (credit)(2)(3)		-161,000,000		-23,000,000	-127,000,000
Charge for curtailments and special termination benefits		0		0	0
Increase in fair value of pension assets		0		0
Employer contributions and benefit payments		31,000,000		34,000,000
Fair value of plan assets	0	0		0	0		0
Expected contribution to benefit plans during 2015		26,000,000
Actual return on plan assets		0		0
Non-Qualified U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments		24,000,000
Expected contribution to benefit plans during 2015		19,000,000
Qualified U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Charge for curtailments and special termination benefits								-9,000,000
Funded status of our plan reduced								-291,000,000
Discount rates				4.90%			4.90%		4.40%
Deferred tax liabilities decrease								-108,000,000
Total equity decreased for changes in cumulative other comprehensive loss								-183,000,000
Expected contribution to benefit plans during 2015		0
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments		3,000,000
Fair value of plan assets	13,000,000	13,000,000		14,000,000			14,000,000
Expected contribution to benefit plans during 2015		3,000,000
Expected Return on Plan Assets		Canadian tax rules require that 50 percent of the assets for nonregistered plans go to a noninterest-bearing refundable tax account. As a result, the return we earn investing the other 50 percent is spread over 100 percent of the assets.
Expected return on plan assets		3.50%		3.50%	3.50%
Canada
Defined Benefit Plan Disclosure [Line Items]
Weighted health care cost trend rate assumed for next year		5.60%		5.70%
U.S.
Defined Benefit Plan Disclosure [Line Items]
Weighted health care cost trend rate assumed for next year		6.30%		6.40%
U.S. | Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected Return on Plan Assets		is comprised of:
		•	a 7.3 percent assumed return from direct investments and
		•	a 1.7 percent assumed return from derivatives.
		Determining our expected return:
		•	requires a high degree of judgment,
		•	uses our historical fund returns as a base and
		•	places added weight on more recent pension plan asset performance.
		Over the 30 years it has been in place, our U.S. pension trust investment strategy has achieved a 14.6 percent net compound annual return rate.
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,840,000,000	4,840,000,000		4,935,000,000	4,439,000,000		4,935,000,000
Fair Value, Inputs, Level 3 | Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,800,000,000	4,800,000,000
Fair value of plan assets, percent	85.80%	85.80%
Fair Value, Inputs, Level 3 | Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0		0			0
Investments | Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		7.30%
Derivatives | Qualified and Registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		1.70%
Investments we are allowed to invest | Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		7.00%
Collective Bargaining Arrangement | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2015		9,000,000
Real Estate Divestiture | Qualified U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Charge for curtailments and special termination benefits								-6,000,000
Charges for restructuring, closures and impairments | Qualified U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Charge for curtailments and special termination benefits								-3,000,000
Gain on postretirement plan amendment | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)(2)(3)		($151,000,000)			($103,000,000)

VARIABLE_INTEREST_ENTITIES_Add

VARIABLE INTEREST ENTITIES - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Proceeds of investments (payments of liabilities) held by special purpose entities	$0	$22	$13
Interest expense	344	369	344
Deferred tax liability	833	850
Special Purpose Entities
Variable Interest Entity [Line Items]
Proceeds of investments (payments of liabilities) held by special purpose entities		22	13
Interest expense	29	29	32
Interest income	34	34	34
Number of qualifying special purpose entities	3
Net equity in SPEs	105
Deferred tax liability	180
Buyer-sponsored SPEs
Variable Interest Entity [Line Items]
Proceeds of investments (payments of liabilities) held by special purpose entities		184	110
Restricted financial investments	615	615
Weighted average interest rate	5.50%	5.10%
Buyer-sponsored SPEs | Restricted bank financial instruments due in 2019
Variable Interest Entity [Line Items]
Restricted financial investments	253
Investment, maturity date	31-Dec-19
Buyer-sponsored SPEs | Restricted bank financial instruments due in 2020
Variable Interest Entity [Line Items]
Restricted financial investments	362
Investment, maturity date	31-Dec-20
Monetization SPEs
Variable Interest Entity [Line Items]
Proceeds of investments (payments of liabilities) held by special purpose entities		-162	-97
Long-term notes	511	511
Weighted average interest rate	5.60%	5.30%
Monetization SPEs | Long-term debt due in 2019
Variable Interest Entity [Line Items]
Long-term notes	209
Debt, maturity date	31-Dec-19
Monetization SPEs | Long-term debt due in 2020
Variable Interest Entity [Line Items]
Long-term notes	$302
Debt, maturity date	31-Dec-20

ACCRUED_LIABILITIES_Details

ACCRUED LIABILITIES (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Wages, salaries and severance pay	$161	$159
Pension and postretirement	47	57
Vacation pay	47	48
Income taxes	4	4
Taxes – Social Security and real and personal property	24	32
Interest	105	104
Customer rebates and volume discounts	46	50
Deferred income	75	82
Other	78	93
Total	$587	$629

LINES_OF_CREDIT_Other_Letters_

LINES OF CREDIT - Other Letters of Credit and Surety Bonds (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Line of Credit Facility [Line Items]
Letters of credit	$44	$39
Surety bonds	$231	$169

LINES_OF_CREDIT_Additional_Inf

LINES OF CREDIT - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Line of Credit Facility [Line Items]
Line of credit, amount outstanding		$0
Compensating balance requirments for our letters of credit		14,000,000
Revolving credit facility, new
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	1,000,000,000
Line of credit, expiration date	30-Sep-18
Revolving credit facility, old
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$1,000,000,000
Line of credit, expiration date	30-Jun-15

LONGTERM_DEBT_LongTerm_Debt_by

LONG-TERM DEBT - Long-Term Debt by Types and Interest Rates (Includes Current Portion) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$0
Other	1	1
Long-term debt, before unamortized discounts	4,896	4,896
Less unamortized discounts	-5	-5
Total	4,891	4,891
Portion due within one year	0	0
6.95% debentures due 2017
Debt Instrument [Line Items]
Long-term debt	281	281
Debt, interest rate	6.95%
Debt, maturity date	31-Dec-17
7.00% debentures due 2018
Debt Instrument [Line Items]
Long-term debt	62	62
Debt, interest rate	7.00%
Debt, maturity date	31-Dec-18
7.375% notes due 2019
Debt Instrument [Line Items]
Long-term debt	500	500
Debt, interest rate	7.38%
Debt, maturity date	31-Dec-19
Variable rate term loan credit facility due 2020
Debt Instrument [Line Items]
Long-term debt	550	550
Debt, maturity date	31-Dec-20
9.00% debentures due 2021
Debt Instrument [Line Items]
Long-term debt	150	150
Debt, interest rate	9.00%
Debt, maturity date	31-Dec-21
7.125% debentures due 2023
Debt Instrument [Line Items]
Long-term debt	191	191
Debt, interest rate	7.13%
Debt, maturity date	31-Dec-23
4.625% notes due 2023
Debt Instrument [Line Items]
Long-term debt	500	500
Debt, interest rate	4.63%
Debt, maturity date	31-Dec-23
8.50% debentures due 2025
Debt Instrument [Line Items]
Long-term debt	300	300
Debt, interest rate	8.50%
Debt, maturity date	31-Dec-25
7.95% debentures due 2025
Debt Instrument [Line Items]
Long-term debt	136	136
Debt, interest rate	7.95%
Debt, maturity date	31-Dec-25
7.70% debentures due 2026
Debt Instrument [Line Items]
Long-term debt	150	150
Debt, interest rate	7.70%
Debt, maturity date	31-Dec-26
7.35% debentures due 2026
Debt Instrument [Line Items]
Long-term debt	62	62
Debt, interest rate	7.35%
Debt, maturity date	31-Dec-26
7.85% debentures due 2026
Debt Instrument [Line Items]
Long-term debt	100	100
Debt, interest rate	7.85%
Debt, maturity date	31-Dec-26
6.95% debentures due 2027
Debt Instrument [Line Items]
Long-term debt	300	300
Debt, interest rate	6.95%
Debt, maturity date	31-Dec-27
7.375% debentures due 2032
Debt Instrument [Line Items]
Long-term debt	1,250	1,250
Debt, interest rate	7.38%
Debt, maturity date	31-Dec-32
6.875% debentures due 2033
Debt Instrument [Line Items]
Long-term debt	275	275
Debt, interest rate	6.88%
Debt, maturity date	31-Dec-33
Industrial revenue bonds, rates from 6.7% to 6.8%, due 2022
Debt Instrument [Line Items]
Long-term debt	$88	$88
Debt, interest rate minimum	6.70%
Debt, interest rate maximum	6.80%
Debt, maturity date	31-Dec-22

LONGTERM_DEBT_Amounts_of_LongT

LONG-TERM DEBT - Amounts of Long-Term Debt Due Annually for the Next Five Years and the Total Amount Due After 2019 (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Long-term debt maturities
2015	$0
2016	0
2017	281
2018	62
2019	500
Thereafter	$4,053

LONGTERM_DEBT_Additional_Infor

LONG-TERM DEBT - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt		$0
Early repayment of long-term debt	40
4.625% notes due 2023
Debt Instrument [Line Items]
Long-term debt	500	500
Net proceeds from issuance of debt	495
Variable rate term loan credit facility due 2020
Debt Instrument [Line Items]
Long-term debt	550	550
Proceeds from long-term debt	550
Longview Timber assumed debt
Debt Instrument [Line Items]
Early repayment of long-term debt	1,118
Pretax charges in connection with early extinguishment of debt	$25

FAIR_VALUE_OF_FINANCIAL_INSTRU2

FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated fair values and carrying values of our long-term debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$4,891	$4,891
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$5,922	$5,683

LEGAL_PROCEEDINGS_COMMITMENTS_2

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Changes in the Reserve for Environmental Remediation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Environmental Exit Cost [Line Items]
Reserve balance as of December 31, 2013	$30
Reserve charges and adjustments, net	4
Payments	-5
Reserve balance as of December 31, 2014	$29
Total active sites as of December 31, 2014	49

LEGAL_PROCEEDINGS_COMMITMENTS_3

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Changes in the Reserve for Asset Retirement Obligations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Loss Contingencies [Line Items]
Reserve balance as of December 31, 2013	$54
Reserve charges and adjustments, net	10
Payments	-10
Other adjustments(1)	-14
Reserve balance as of December 31, 2014	$40

LEGAL_PROCEEDINGS_COMMITMENTS_4

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Our purchase obligations (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase obligation in 2015	$35
Purchase obligation in 2016	16
Purchase obligation in 2017	6
Purchase obligation in 2018	6
Purchase obligation in 2019	2
Purchase obligation Thereafter	$7

LEGAL_PROCEEDINGS_COMMITMENTS_5

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Our rent expense (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Rent expense	$32	$38	$36

LEGAL_PROCEEDINGS_COMMITMENTS_6

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Our operating lease commitments (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Operating Leased Assets [Line Items]
Operating lease commitment due 2015	$28
Operating lease commitment due 2016	21
Operating lease commitment due 2017	20
Operating lease commitment due 2018	16
Operating lease commitment due 2019	12
Operating lease commitment due Thereafter	$107

LEGAL_PROCEEDINGS_COMMITMENTS_7

LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Loss Contingencies [Line Items]
Remediation costs for all identified sites may exceed reserves	$108
Timberlands lease
Loss Contingencies [Line Items]
Lease expiration date	31-Dec-23
Guaranteed future payments on lease	$16

SHAREHOLDERS_INTEREST_Reconcil

SHAREHOLDERS' INTEREST - Reconciliation of Our Common Share Activity (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Outstanding at beginning of year		583,548,428	542,393,000	536,425,000
New issuance (Note 4)		0	33,350,000	0
Shares tendered (Note 3)	-58,813,151	-58,813,151	0	0
Issued for restricted stock units		451,000	462,000	523,000
Issued for Directors' stock-equivalent units		0	0	41,000
Repurchased		-6,063,000	0	0
Outstanding at end of year		524,474,315	583,548,428	542,393,000
Stock options exercised
Class of Stock [Line Items]
Shares issued		5,134,000	7,209,000	5,404,000
Issued for performance shares
Class of Stock [Line Items]
Shares issued		217,000	134,000	0

SHAREHOLDERS_INTEREST_Changes_

SHAREHOLDERS' INTEREST - Changes in amounts included in our cumulative other comprehensive income (loss) by component (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Beginning balance	($686)	($1,558)
Other comprehensive income (loss) before reclassifications	-1,075	1,156
Income taxes	377	-428
Net other comprehensive income (loss) before reclassifications	-698	728
Amounts reclassified from cumulative other comprehensive income (loss)(1)	-19	219
Income taxes	10	-75
Net amounts reclassified from cumulative other comprehensive income (loss)	-9	144
Total other comprehensive income (loss)	-707	872
Ending balance	-1,393	-686
Foreign currency translation adjustments
Beginning balance	354	413
Other comprehensive income (loss) before reclassifications	-50	-59
Income taxes	0	0
Net other comprehensive income (loss) before reclassifications	-50	-59
Amounts reclassified from cumulative other comprehensive income (loss)(1)	0	0
Income taxes	0	0
Net amounts reclassified from cumulative other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	-50	-59
Ending balance	304	354
Unrealized gains on available-for-sale securities
Beginning balance	6	4
Other comprehensive income (loss) before reclassifications	0	2
Income taxes	0	0
Net other comprehensive income (loss) before reclassifications	0	2
Amounts reclassified from cumulative other comprehensive income (loss)(1)	0	0
Income taxes	0	0
Net amounts reclassified from cumulative other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	0	2
Ending balance	6	6
Pension | Actuarial losses
Beginning balance	-1,066	-1,942
Other comprehensive income (loss) before reclassifications	-1,008	1,123
Income taxes	369	-394
Net other comprehensive income (loss) before reclassifications	-639	729
Amounts reclassified from cumulative other comprehensive income (loss)(1)	125	221
Income taxes	-43	-74
Net amounts reclassified from cumulative other comprehensive income (loss)	82	147
Total other comprehensive income (loss)	-557	876
Ending balance	-1,623	-1,066
Pension | Prior service credits (costs)
Beginning balance	-19	-23
Other comprehensive income (loss) before reclassifications	1	0
Income taxes	0	0
Net other comprehensive income (loss) before reclassifications	1	0
Amounts reclassified from cumulative other comprehensive income (loss)(1)	5	7
Income taxes	-2	-3
Net amounts reclassified from cumulative other comprehensive income (loss)	3	4
Total other comprehensive income (loss)	4	4
Ending balance	-15	-19
Other Postretirement Benefits | Actuarial losses
Beginning balance	-111	-137
Other comprehensive income (loss) before reclassifications	-6	24
Income taxes	1	-7
Net other comprehensive income (loss) before reclassifications	-5	17
Amounts reclassified from cumulative other comprehensive income (loss)(1)	12	14
Income taxes	-4	-5
Net amounts reclassified from cumulative other comprehensive income (loss)	8	9
Total other comprehensive income (loss)	3	26
Ending balance	-108	-111
Other Postretirement Benefits | Prior service credits (costs)
Beginning balance	150	127
Other comprehensive income (loss) before reclassifications	-12	66
Income taxes	7	-27
Net other comprehensive income (loss) before reclassifications	-5	39
Amounts reclassified from cumulative other comprehensive income (loss)(1)	-161	-23
Income taxes	59	7
Net amounts reclassified from cumulative other comprehensive income (loss)	-102	-16
Total other comprehensive income (loss)	-107	23
Ending balance	$43	$150

SHAREHOLDERS_INTEREST_Addition

SHAREHOLDERS' INTEREST - Additional Information (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Aug. 13, 2014
				Rate
Class of Stock [Line Items]
New shares issued	0	33,350,000	0
Stock repurchase program, shares repurchased	6,063,000	0	0
Stock repurchase program, repurchase of common stock, cash settlement	$203	$0	$0
Stock repurchase program 2014
Class of Stock [Line Items]
Stock repurchase program, authorized repurchase amount					700
Stock repurchase program, shares repurchased	6,062,993
Stock repurchase program, shares repurchased value	203
Stock repurchase program, remaining authorized repurchase amount	497
Preferred shares
Class of Stock [Line Items]
Preferred shares, outstanding	0	0
Preferred shares, authorized	7,000,000
Preferred shares, par value	$1
6.375 percent Mandatory Convertible Preference Shares, Series A
Class of Stock [Line Items]
Preferred shares, outstanding	13,800,000	13,800,000
Preferred shares, authorized	40,000,000	40,000,000
Preferred shares, par value	$1	$1		$1
New shares issued				13,800,000
Preference shares, liquidation preference	$50	$50		$50
Net proceeds from issuance of preference shares				$669
Preference shares, dividend rate				6.38%
Minimum | 6.375 percent Mandatory Convertible Preference Shares, Series A
Class of Stock [Line Items]
Preference shares, shares that will be issued upon conversion	1.509
Maximum | 6.375 percent Mandatory Convertible Preference Shares, Series A
Class of Stock [Line Items]
Preference shares, shares that will be issued upon conversion	1.8107

SHAREBASED_COMPENSATION_Weight

SHARE-BASED COMPENSATION - Weighted Average Assumptions Used in Estimating the Value of Stock Options Granted (Details) (Stock options, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	31.71%	38.00%	40.41%
Expected dividends	2.92%	2.23%	2.94%
Expected term (in years)	4 years 11 months 19 days	4 years 11 months 19 days	5 years 3 months 29 days
Risk-free rate	1.57%	0.92%	1.01%
Weighted average grant-date fair value	$6.62	$8.40	$5.72

SHAREBASED_COMPENSATION_Schedu

SHARE-BASED COMPENSATION - Schedule of Stock Option Activity (Details) (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014
Options
Balance, beginning of year	17,055
Granted	2,463
Exercised	-5,294
Forfeited or expired(1)	-1,939
Balance, end of year	12,285
Exercisable, end of year	8,267
Number of options outstanding that have met the requisite service period and will be released as identifed in the grant terms	998
Weighted Average Exercise Price
Balance, beginning of year	$23.12
Granted	$30.14
Exercised	$22.50
Forfeited or expired(1)	$26.98
Balance, end of year	$24.19
Exercisable, end of year	$22.32
Weighted Average Remaining Contractual Term
Balance, end of year	5 years 3 months 7 days
Exercisable, end of year	3 years 9 months 22 days
Aggregate Intrinsic Value
Balance, end of year	$144
Exercisable, end of year	$112
Real Estate Divestiture
Options
Forfeited or expired(1)	-1,601

SHAREBASED_COMPENSATION_Schedu1

SHARE-BASED COMPENSATION - Schedule of Restricted Stock Units Award Activity (Details) (Restricted stock units, USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Units
Balance, beginning of year	1,547
Granted	686
Vested	-628
Forfeited(1)	-378
Balance, end of year	1,227	1,547
Nonvested restricted stock units that have met the requisite service period and will be released as identified in the grant terms	212
Weighted Average Grant Date Fair Value
Balance, beginning of year	$25.83
Granted	$30.14	$30.54	$20.42
Vested	$24.94
Forfeited(1)	$27.90
Balance, end of year	$28.06	$25.83
Real Estate Divestiture
Stock Units
Forfeited(1)	-280

SHAREBASED_COMPENSATION_Weight1

SHARE-BASED COMPENSATION - Weighted Average Assumptions Used in Estimating the Value of Performance Share Units (Details) (Performance share units, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1/1/2014 – 12/31/2015	1/1/2013 – 12/31/2014	1/1/2012 – 12/31/2013
Valuation date closing stock price	$30.16	$30.48	$20.56
Expected dividends	2.91%	2.23%	2.92%
Risk-free rate minimum	0.03%	0.09%	0.08%
Risk-free rate maximum	0.79%	0.46%	0.32%
Volatility minimum	20.74%	22.09%	34.66%
Volatility maximum	23.53%	29.57%	34.86%
Weighted average grant-date fair value	$30.62	$31.59	$21.71

SHAREBASED_COMPENSATION_Schedu2

SHARE-BASED COMPENSATION - Schedule of Performance Share Units Activity (Details) (Performance share units, USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Units
Balance, beginning of year	1,102
Granted	321
Vested	-311
Forfeited(1)	-206
Performance adjustment	-16
Balance, end of year	890	1,102
Nonvested performance share units that have met the requisite service period and will be released as identified in the grant terms	393
Weighted Average Grant Date Fair Value
Balance, beginning of year	$26.83
Granted	$30.62	$31.59	$21.71
Vested	$23.32
Forfeited(1)	$26.07
Performance adjustment	$31.15
Balance, end of year	$29.46	$26.83
Real Estate Divestiture
Stock Units
Forfeited(1)	-44

SHAREBASED_COMPENSATION_Weight2

SHARE-BASED COMPENSATION - Weighted Average Assumptions Used to Re-measure the Value of Stock Appreciation Rights (Details) (Stock appreciation rights, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	18.20%	24.02%	29.07%
Expected dividends	3.21%	2.81%	2.44%
Expected term (in years)	1 year 3 months 26 days	1 year 1 month 28 days	1 year 8 months 16 days
Risk-free rate	0.45%	0.19%	0.27%
Weighted average fair value	$12.70	$8.68	$7.25

SHAREBASED_COMPENSATION_Schedu3

SHARE-BASED COMPENSATION - Schedule of Stock Appreciation Rights Activity (Details) (Stock appreciation rights, USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	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

SHAREBASED_COMPENSATION_Additi

SHARE-BASED COMPENSATION - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Share-based compensation expense	$40,000,000		$42,000,000	$37,000,000
Number of shares available for future grants under the Plan	19,466,670
Number of shares of stock options and stock appreciation rights an individual may receive in one year	2,000,000
Number of shares of restricted stock, restricted stock units, performance shares, performance share units or other equity grants an individual may receive in one year	1,000,000
Value of awards no participant may be granted in a 12 month period	10,000,000
Increase in common share if all share-based awards were exercised or vested	34,000,000
Total income tax benefit from share-based awards	11,000,000		10,000,000	9,000,000
Realized excess tax benefits	10,000,000		13,000,000	5,000,000
Total intrinsic value of stock options exercised	55,000,000		61,000,000	28,000,000
Total grant-date fair value of stock options vested	16,000,000		14,000,000	15,000,000
Detail of deferred compensation stock equivalent units	Certain employees and our board of directors may defer compensation into stock-equivalent units.
	The Details
	The plan works differently for employees and directors.
	Eligible employees:
	•	may choose to defer all or part of their bonus into stock-equivalent units;
	•	may choose to defer part of their salary, except for executive officers; and
	•	receive a 15 percent premium if the deferral is for at least five years.
	Our directors:
	•	receive a portion of their annual retainer fee in the form of restricted stock units, which vest over one year and may be deferred into stock-equivalent units;
	•	may choose to defer some or all of the remainder of their annual retainer fee into stock-equivalent units; and
	•	do not receive a premium for their deferrals.
	Employees and directors also choose when the deferrals will be paid out although no deferrals may be paid until after the separation from service of the employee or director.
Number of common shares issued for deferred compensation stock equivalent units	71,056		52,720	40,899
Number of common shares to be issued for directors who elected common share payments subsequent to year-end	605,987
Number of stock-equivalent units outstanding in deferred compensation accounts	944,966		915,160	971,650
Stock options
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Terms of award	Our stock options generally:
	•	vest over four years of continuous service and
	•	must be exercised within 10 years of the grant-date.
	The vesting and post-termination vesting terms for stock options granted in 2014, 2013 and 2012 were as follows:
	•	vest ratably over four years;
	•	vest or continue to vest in the event of death while employed, disability or retirement at an age of at least 62;
	•	continue to vest upon retirement at an age of at least 62, but a portion of the grant is forfeited if retirement occurs before the one year anniversary of the grant;
	•	continue to vest for one year in the event of involuntary termination when the retirement criteria has not been met; and
	•	stop vesting for all other situations including early retirement prior to age 62.
Restricted stock units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Terms of award	Our restricted stock units granted in 2014, 2013 and 2012 generally:
	•	vest ratably over four years;
	•	immediately vest in the event of death while employed or disability;
	•	continue to vest upon retirement at an age of at least 62, but a portion of the grant is forfeited if retirement occurs before the one year anniversary of the grant;
	•	continue vesting for one year in the event of involuntary termination when the retirement has not been met; and
	•	will be forfeited upon termination of employment in all other situations including early retirement prior to age 62.
Weighted average grant-date fair value	$30.14		$30.54	$20.42
Total grant-date fair value vested	16,000,000		14,000,000	19,000,000
Performance share units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Terms of award	The final number of shares awarded will range from 0 percent to 150 percent of each grant’s target, depending upon actual company performance.
	The ultimate number of performance share units earned is based on two measures:
	•	Weyerhaeuser’s cash flow during the first year determined the initial number of units earned and
	•	Weyerhaeuser’s relative total shareholder return (TSR) ranking in the S&P 500 during the first two years is used to adjust the initial number of units earned up or down by 20 percent.
	At the end of the two-year performance period and over a further two-year vesting period, performance share units would be paid in shares of our stock. Performance share units granted and that are earned vest as follows:
	•	vest 50 percent, 25 percent and 25 percent on the second, third and fourth anniversaries of the grant-date, respectively, as long as the individual remains employed by the company;
	•	fully vest in the event the participant dies or becomes disabled while employed;
	•	continue to vest upon retirement at an age of at least 62, but a portion of the grant is forfeited if retirement occurs before the one year anniversary of the grant;
	•	continue vesting for one year in the event of involuntary termination when the retirement has not been met; and
	•	will be forfeited upon termination of employment in all other situations including early retirement prior to age 62.
Weighted average grant-date fair value	$30.62		$31.59	$21.71
Total grant-date fair value vested	7,000,000		5,000,000	0
Performance share units | Minimum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Final number of shares awarded of each grant's target	0.00%
Performance share units | Maximum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Final number of shares awarded of each grant's target	150.00%
Total shareholder return ranking in the S&P 500 during the first two years is used to adjust the initial number of units earned up or down	20.00%
Stock appreciation rights
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Terms of award	Stock appreciation rights are similar to stock options. Employees benefit when the market price of our stock is higher on the exercise date than it was on the date the stock appreciation rights were granted. The differences are that the employee:
	•	receives the benefit as a cash award and
	•	does not purchase the underlying stock.
	The vesting conditions and exceptions are the same as for 10-year stock options. Details are in the Stock Options section earlier in this note.
	Stock appreciation rights are generally issued to employees outside of the U.S.
Total liabilities paid	2,000,000		4,000,000	1,000,000
Equity-classified share-based compensation arrangements
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized share-based compensation cost	39,000,000
Unrecognized share-based compensation costs, weighted average period for recognition	2 years 3 months 18 days
Liability-classified stock appreciation rights
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized share-based compensation cost	1,000,000
Unrecognized share-based compensation costs, weighted average period for recognition	2 years 3 months 18 days
2014 grants | Performance share units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Final number of shares awarded of each grant's target	114.00%
2013 grants | Performance share units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Final number of shares awarded of each grant's target	150.00%
Total shareholder return ranking in the S&P 500 during the first two years is used to adjust the initial number of units earned up or down	15.00%
2012 grants | Performance share units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Final number of shares awarded of each grant's target	122.00%
Total shareholder return ranking in the S&P 500 during the first two years is used to adjust the initial number of units earned up or down	17.00%
Real Estate Divestiture
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Share-based compensation expense	3,000,000		5,000,000	4,000,000
Total income tax benefit from share-based awards	1,000,000		2,000,000	1,000,000
Realized excess tax benefits	$2,000,000		$2,000,000	$1,000,000

CHARGES_FOR_RESTRUCTURING_CLOS2

CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS - Items Included in Our Restructuring, Closure and Asset Impairment Charges (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring and closure charges:
Termination benefits	$27	$1	$0
Pension and postretirement charges	3	0	0
Other restructuring and closure costs	12	4	6
Charges for restructuring and closures	42	5	6
Impairment of long-lived assets	2	372	20
Total charges for restructuring, closures and impairments	$44	$377	$26

CHARGES_FOR_RESTRUCTURING_CLOS3

CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS - Changes in accrued severance related to restructuring (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Costs and Asset Impairment Charges [Abstract]
Accrued severance as of December 31, 2013	$2
Charges	27	1	0
Payments	-19
Accrued severance as of December 31, 2014	$10	$2

CHARGES_FOR_RESTRUCTURING_CLOS4

CHARGES FOR RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS - Additional Information (Details) (USD $)	12 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013
Fair Value, Inputs, Level 3 | Wood Products
Impairment of long-lived assets	$9
Unallocated Items | Fair Value, Inputs, Level 2 and 3 | Coyote Springs Property
Non-cash impairment charge		$356

OTHER_OPERATING_INCOME_NET_Var

OTHER OPERATING INCOME, NET - Various Income and Expense Items Included in Other Operating Income, Net (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	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	-19	-28
Foreign exchange (gains) losses, net	27	7	-6
Land management income	-34	-28	-27
Litigation expense, net	9	16	12
Other, net	-25	-11	-26
Total	($201)	($35)	($178)

OTHER_OPERATING_INCOME_NET_Add

OTHER OPERATING INCOME, NET - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gain on disposition of non-strategic assets	$27	$19	$28
Landfill in Washington State
Gain on disposition of non-strategic assets	$22

INCOME_TAXES_Domestic_and_Fore

INCOME TAXES - Domestic and Foreign Earnings (Loss) From Continuing Operations Before Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Domestic earnings									$970	$198	$333
Foreign earnings (loss)									43	122	-11
Earnings from continuing operations before income taxes	$214	$237	$328	$234	($252)	$170	$221	$181	$1,013	$320	$322

INCOME_TAXES_Provision_Benefit

INCOME TAXES - Provision (Benefit) for Income Taxes From Continuing Operations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	($26)	($80)	($78)
State	12	-18	-11
Foreign	3	-21	26
Total	-11	-119	-63
Deferred:
Federal	178	-79	6
State	6	6	1
Foreign	12	21	66
Total	196	-52	73
Total income tax provision (benefit)	$185	($171)	$10

INCOME_TAXES_Effective_Income_

INCOME TAXES - Effective Income Tax Rate Applicable to Continuing Operations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. federal statutory income tax	$354	$112	$113
State income taxes, net of federal tax benefit	14	7	3
REIT income not subject to federal income tax	-161	-101	-94
Foreign taxes	-2	-8	8
Provision for unrecognized tax benefits	-4	-193	-6
Repatriation of Canadian earnings	0	21	0
State income tax settlement	0	0	-10
Domestic production activities deduction	0	-13	0
Other, net	-16	4	-4
Total income tax provision (benefit)	$185	($171)	$10
Effective income tax rate	18.30%	-53.40%	3.10%

INCOME_TAXES_Balance_Sheet_Cla

INCOME TAXES - Balance Sheet Classification of Deferred Income Tax Assets (Liabilities) Related to Continuing Operations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Net current deferred tax asset	$228	$130
Net noncurrent deferred tax asset	8	5
Net noncurrent deferred tax liability	-206	-285
Net deferred tax asset (liability)	$30	($150)

INCOME_TAXES_Items_Included_in

INCOME TAXES - Items Included in Our Deferred Income Tax Assets (Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Postretirement benefits	$101	$102
Pension	369	57
Real estate impairments	0	121
State tax credits	56	59
Net operating loss carryforwards	86	110
Cellulosic biofuel producers credit	100	80
Other	223	260
Gross deferred tax assets	935	789
Valuation allowance	-72	-89
Net deferred tax assets	863	700
Property, plant and equipment	-523	-540
Timber installment notes	-180	-180
Other	-130	-130
Deferred tax liabilities	-833	-850
Net deferred tax asset (liability)	$30	($150)

INCOME_TAXES_Reconciliation_of

INCOME TAXES - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Balance at beginning of year	$26	$177
Reductions for tax positions of prior years	0	-148
Lapse of statute	-15	-3
Balance at end of year	$11	$26

INCOME_TAXES_Additional_Inform

INCOME TAXES - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net operating loss carryforwards	$86	$110
Valuation allowance	-72	-89
Change in our valuation allowance	-17
Foreign undistributed earnings	27
Unrecognized tax benefits	11	26	177
Unrecognized tax benefits, interest	3	4
Unrecognized tax benefits, payment made in advance of settlements	6	6
Credits and loss carryovers	4
Unrecognized tax benefits, net	4	24
Unrecognized tax benefits that would affect our effective tax rate	12	16
Unrecognized tax benefits, decrease estimate due to resolution of examinations	6
With expiration | State and foreign
Net operating loss carryforwards	586
With expiration | State and foreign | Minimum
Net operating loss carryforwards, expiration dates	31-Dec-15
With expiration | State and foreign | Maximum
Net operating loss carryforwards, expiration dates	31-Dec-34
With expiration | Federal, state and foreign
Credit carryforwards	148
With expiration | Federal, state and foreign | Minimum
Credit carryforwards, expiration dates	31-Dec-15
With expiration | Federal, state and foreign | Maximum
Credit carryforwards, expiration dates	31-Dec-34
Without expiration | State and foreign
Net operating loss carryforwards	1
Without expiration | Federal, state and foreign
Credit carryforwards	$31

GEOGRAPHIC_AREAS_Sales_by_Geog

GEOGRAPHIC AREAS - Sales by Geographic Area (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$1,788	$1,915	$1,964	$1,736	$1,768	$1,857	$1,874	$1,755	$7,403	$7,254	$5,989
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									4,889	4,761	3,867
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									682	758	639
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									328	298	300
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									477	453	360
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									424	418	302
South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									87	80	74
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									516	486	447
Export sales from the U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,892	1,891	1,682
Export sales from the U.S. | Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									620	676	583
Export sales from the U.S. | China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									416	411	329
Export sales from the U.S. | Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$856	$804	$770

GEOGRAPHIC_AREAS_LongLived_Ass

GEOGRAPHIC AREAS - Long-Lived Assets by Geographic Area (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$9,324	$9,438	$6,923
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	8,069	8,116	5,523
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	579	652	728
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$676	$670	$672

SELECTED_QUARTERLY_FINANCIAL_I2

SELECTED QUARTERLY FINANCIAL INFORMATION (unaudited) - Key Quarterly Financial Data for the Last Two Years (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$1,788	$1,915	$1,964	$1,736	$1,768	$1,857	$1,874	$1,755	$7,403	$7,254	$5,989
Operating income (loss)	294	318	400	308	-155	243	293	253	1,320	634	618
Earnings (loss) from continuing operations before income taxes	214	237	328	234	-252	170	221	181	1,013	320	322
Net earnings	177	1,164	291	194	54	167	198	144	1,826	563	384
Net earnings attributable to Weyerhaeuser common shareholders	166	1,153	280	183	43	157	196	144	1,782	540	385
Basic net earnings per share attributable to Weyerhaeuser common shareholders	$0.32	$2.17	$0.48	$0.31	$0.07	$0.27	$0.35	$0.26	$3.20	$0.95	$0.71
Diluted net earnings per share attributable to Weyerhaeuser common shareholders	$0.31	$2.15	$0.47	$0.31	$0.07	$0.27	$0.35	$0.26	$3.18	$0.95	$0.71
Dividends paid per share	$0.29	$0.29	$0.22	$0.22	$0.22	$0.22	$0.20	$0.17	$1.02	$0.81	$0.62
Net gain on divestiture									972	0	0
Maximum
Market prices - high/low	$36.88	$34.60	$33.26	$31.59	$32	$29.86	$33.24	$31.74	$36.88	$33.24
Minimum
Market prices - high/low	$31.61	$31.09	$27.48	$28.63	$28.01	$26.64	$26.38	$28.36	$27.48	$15.25
Real Estate Divestiture
Net gain on divestiture		972							972
Unallocated Items | Coyote Springs Property | Fair Value, Inputs, Level 2 and 3
Non-cash impairment charge					$356