Owens Corning (OC) 10-K 11 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	Owens Corning
Entity Central Index Key	1370946
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$4,578,079,225
Entity Common Stock, Shares Outstanding		117,747,548

CONSOLIDATED_STATEMENTS_OF_EAR

CONSOLIDATED STATEMENTS OF EARNINGS (LOSS) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
NET SALES	$5,276	$5,295	$5,172
COST OF SALES	4,300	4,329	4,375
Gross margin	976	966	797
OPERATING EXPENSES
Marketing and administrative expenses	487	530	509
Science and technology expenses	76	77	79
Charges related to cost reduction actions	37	8	51
Other expenses (income), net	-16	-34	10
Total operating expenses	584	581	649
EARNINGS BEFORE INTEREST AND TAXES	392	385	148
Interest expense, net	114	112	114
Loss on extinguishment of debt	46	0	74
EARNINGS (LOSS) BEFORE TAXES	232	273	-40
Less: Income tax expense (benefit)	5	68	-28
Equity in net earnings of affiliates	1	0	-4
NET EARNINGS (LOSS)	228	205	-16
Less: Net earnings attributable to noncontrolling interests	2	1	3
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$226	$204	($19)
EARNINGS (LOSS) PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING COMMON STOCKHOLDERS
Basic (dollars per share)	$1.92	$1.73	($0.16)
Diluted (dollars per share)	$1.91	$1.71	($0.16)
Dividend (dollars per share)	$0.64	$0	$0
WEIGHTED AVERAGE COMMON SHARES
Basic (in shares)	117.5	118.2	119.4
Diluted (in shares)	118.3	119.1	119.4

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (LOSS) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
NET EARNINGS (LOSS)	$228	$205	($16)
Currency translation adjustment	-134	-28	5
Pension and other postretirement adjustment (net of tax of $67, $(45) and $27, for the periods ended December 31, 2014, 2013 and 2012, respectively)	-113	94	-56
Deferred income (loss) on hedging (net of tax of $3, $(1) and $0, for the periods ended December 31, 2014, 2013 and 2012, respectively)	-6	1	2
COMPREHENSIVE EARNINGS (LOSS)	-25	272	-65
Less: Comprehensive earnings attributable to noncontrolling interests	2	1	3
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	($27)	$271	($68)

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (LOSS) (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Pension and other postretirement adjustment	$67	($45)	$27
Deferred income (loss) on hedging	$3	($1)	$0

CONSOLIDATED_BALANCE_SHEETS_CO

CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$67		$57		$55	$52
Receivables, less allowances of $10 at December 31, 2014 and $14 at December 31, 2013	674		683
Inventories	817		810
Assets held for sale – current	16		29
Other current assets	233		269
Total current assets	1,807		1,848
Property, plant and equipment, net	2,899		2,932
Goodwill	1,168		1,166
Intangible assets	1,017		1,040
Deferred income taxes	444		436
Other non-current assets	220		225
TOTAL ASSETS	7,555		7,647
CURRENT LIABILITIES
Accounts payable and accrued liabilities	949		988
Short-term debt	31		1
Long-term debt – current portion	3		3
Total current liabilities	983		992
Long-term debt, net of current portion	1,991		2,024
Pension plan liability	447		336
Other employee benefits liability	252		242
Deferred income taxes	22		23
Other liabilities	130		200
OWENS CORNING STOCKHOLDERS’ EQUITY
Preferred stock, par value $0.01 per share (a)	0	[1]	0	[1]
Common stock, par value $0.01 per share (b)	1	[2]	1	[2]
Additional paid in capital	3,954		3,938
Accumulated earnings	805		655
Accumulated other comprehensive deficit	-550		-297		-364
Cost of common stock in treasury (c)	-518	[3]	-504	[3]
Total Owens Corning stockholders’ equity	3,692		3,793
Noncontrolling interests	38		37
Total equity	3,730		3,830		3,575	3,741
TOTAL LIABILITIES AND EQUITY	$7,555		$7,647
[1]	10 shares authorized; none issued or outstanding at December 31, 2014 and December 31, 2013
[2]	400 shares authorized; 135.5 issued and 117.8 outstanding at December 31, 2014 and December 31, 2013
[3]	17.7 shares at December 31, 2014 and December 31, 2013

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$10	$14
Preferred stock, par value	$0.01	$0.01
Preferred stock, authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, authorized	400,000,000	400,000,000
Common stock, issued	135,500,000	135,500,000
Common stock, outstanding	117,800,000	117,800,000
Treasury stock shares	17,700,000	17,700,000

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock Outstanding [Member]	Treasury Stock [Member]	Additional Paid In Capital [Member]		Accumulated Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income [Member]		Noncontrolling Interest [Member]
In Millions, except Share data, unless otherwise specified
Beginning Balance at Dec. 31, 2011	$3,741	$1	($362)	$3,907	[1]	$470	($315)	[2]	$40	[3]
Beginning Balance (in shares) at Dec. 31, 2011		120,900,000	13,500,000
Increase Decrease In Stockholders Equity [Roll Forward]
Net earnings (loss) attributable to Owens Corning	-16					-19			3	[3]
Currency translation adjustment	5						5	[2]
Pension and other postretirement adjustment (net of tax)	-56						-56	[2]
Deferred gain on hedging transactions (net of tax)	2						2	[2]
Total comprehensive earnings	-65
Changes in subsidiary shares from noncontrolling interests	-22			-16	[1]				-6	[3]
Stock issuance (in shares)	520,120	500,000
Stock issuance	11			11	[1]
Purchases of treasury stock	-113		-113
Purchase of treasury stock (in shares)		3,800,000	3,800,000
Stock-based compensation	23			23	[1]
Stock-based compensation (in shares)		700,000
Ending Balance at Dec. 31, 2012	3,575	1	-475	3,925	[1]	451	-364	[2]	37	[3]
Ending Balance (in shares) at Dec. 31, 2012		118,300,000	17,300,000
Increase Decrease In Stockholders Equity [Roll Forward]
Net earnings (loss) attributable to Owens Corning	205					204			1	[3]
Currency translation adjustment	-29						-28	[2]	-1	[3]
Pension and other postretirement adjustment (net of tax)	94						94	[2]
Deferred gain on hedging transactions (net of tax)	1						1	[2]
Total comprehensive earnings	271
Stock issuance (in shares)	549,800	500,000	600,000
Stock issuance	16		17	-1	[1]
Purchases of treasury stock	-63		-63
Purchase of treasury stock (in shares)		1,600,000	1,600,000
Stock-based compensation	31		17	14	[1]
Stock-based compensation (in shares)		600,000	600,000
Ending Balance at Dec. 31, 2013	3,830	1	-504	3,938	[1]	655	-297	[2]	37	[3]
Ending Balance (in shares) at Dec. 31, 2013		117,800,000	17,700,000
Increase Decrease In Stockholders Equity [Roll Forward]
Net earnings (loss) attributable to Owens Corning	228					226			2
Currency translation adjustment	-135						-134		-1
Pension and other postretirement adjustment (net of tax)	-113						-113
Deferred gain on hedging transactions (net of tax)	-6						-6
Total comprehensive earnings	-26
Changes in subsidiary shares from noncontrolling interests	-6
Stock issuance (in shares)	328,875	300,000	300,000
Stock issuance	14		30	-16	[1]
Purchases of treasury stock	-44		-44
Purchase of treasury stock (in shares)		1,000,000	1,000,000
Stock-based compensation	32			32	[1]
Stock-based compensation (in shares)		700,000	700,000
Dividends declared	-76					-76
Ending Balance at Dec. 31, 2014	$3,730	$1	($518)	$3,954	[1]	$805	($550)	[2]	$38	[3]
Ending Balance (in shares) at Dec. 31, 2014		117,800,000	17,700,000
[1]	Additional Paid in Capital (“APIC”)
[2]	Accumulated Other Comprehensive Earnings (Deficit) (“AOCI”)
[3]	Noncontrolling Interest (“NCI”)

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES
NET EARNINGS (LOSS)	$228	$205	($16)
Adjustments to reconcile net earnings (loss) to cash provided by operating activities:
Depreciation and amortization	304	332	349
Gain on sale of assets or affiliates	-55	-6	-17
Impairment of European Stone Business	20	0	0
Proceeds from Hurricane Sandy insurance claims	0	-58	-20
Deferred income taxes	-15	54	-59
Provision for pension and other employee benefits liabilities	18	23	36
Stock-based compensation expense	29	28	24
Other non-cash	-30	-18	-14
Loss on extinguishment of debt	46	0	74
Changes in receivables, net	-10	-77	24
Changes in inventories	-29	-27	-4
Changes in accounts payable and accrued liabilities	-8	46	23
Changes in other current assets	-3	4	-39
Other	0	0	2
Pension fund contribution	-52	-39	-50
Payments for other employee benefits liabilities	-22	-22	-22
Other	20	-38	39
Net cash flow provided by operating activities	441	407	330
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	-363	-335	-304
Derivative settlements	5	0	0
Proceeds from the sale of assets or affiliates	65	0	10
Investment in subsidiaries and affiliates, net of cash acquired	-12	-62	0
Proceeds from Hurricane Sandy insurance claims	0	58	20
Deposit related to sale of Hangzhou, China plant	0	34	0
Purchases of alloy	-28	-18	-28
Proceeds from sale of alloy	47	16	49
Net cash flow used for investing activities	-286	-307	-253
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	1,276	1,063	1,877
Payments on senior revolving credit and receivables securitization facilities	-1,344	-1,103	-1,957
Proceeds from long-term debt	390	0	599
Payments on long-term debt	-402	-2	-441
Purchase of noncontrolling interest	0	0	-22
Dividends paid	-56	0	0
Net increase (decrease) in short-term debt	30	-4	-23
Purchases of treasury stock	-44	-63	-113
Other	8	13	4
Net cash flow provided by used for financing activities	-142	-96	-76
Effect of exchange rate changes on cash	-3	-2	2
Net increase in cash and cash equivalents	10	2	3
Cash and cash equivalents at beginning of period	57	55	52
Cash and cash equivalents at end of period	67	57	55
Cash paid during the year for income taxes	19	29	30
Cash paid during the year for interest	$122	$126	$122

BUSINESS_AND_SUMMARY_OF_SIGNIF

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Description of Business
	Owens Corning, a Delaware corporation, is a leading global producer of glass fiber reinforcements and other materials for composite systems and of residential and commercial building materials. In the fourth quarter of 2014, Owens Corning announced organizational changes to streamline the Company's management structure and reduce costs. As a a result of this action, the Building Materials Group organizational structure was eliminated. The Company now operates within three segments: Composites, which includes the Company’s Reinforcements and Downstream businesses; Insulation and Roofing. Through these lines of business, Owens Corning manufactures and sells products worldwide. The Company maintains leading market positions in all of its major product categories.
	General
	On February 5, 2015, the Board of Directors declared a quarterly dividend of $0.17 per common share payable on April 2, 2015 to shareholders of record as of March 13, 2015.
	In the fourth quarter of 2014, the Company recorded additional income tax expense of $6 million related to prior periods. The effect was not material to the current or any previously issued financial statements.
	In the second quarter of 2014, the Company determined that cash flows from operating activities and cash flows used in financing activities were each overstated by $11 million for the period ended December 31, 2013, due to the misclassification of non-cash debt fair value hedge adjustments. The effect of the misclassification was not material to any previously issued financial statements. The Consolidated Statement of Cash Flows for the twelve months ended December 31, 2013 has been revised to reduce cash flows from operating activities and cash flows used in financing activities by $11 million.
	Basis of Presentation
	Unless the context requires otherwise, the terms “Owens Corning,” “Company,” “we” and “our” in this report refer to Owens Corning and its subsidiaries.
	The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States.
	Principles of Consolidation
	The Consolidated Financial Statements of the Company include the accounts of majority-owned subsidiaries. Intercompany accounts and transactions are eliminated.
	Reclassifications
	Certain reclassifications have been made to the 2013 and 2012 Consolidated Financial Statements and Notes to the Consolidated Financial Statements to conform to the classifications used in 2014.
	Use of Estimates and Assumptions
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates.
	Revenue Recognition
	Revenue is recognized when title and risk of loss pass to the customer and collectability is reasonably assured. Provisions for discounts and rebates to customers, returns, warranties and other adjustments are provided in the same period that the related sales are recorded and are based on historical experience, current conditions and contractual obligations, as applicable.
	Cost of Sales
	Cost of sales includes material, labor, energy and manufacturing overhead costs, including depreciation and amortization expense associated with the manufacture and distribution of the Company’s products. Distribution costs include inbound freight costs; purchasing and receiving costs; inspection costs; warehousing costs; shipping and handling costs, which include costs incurred relating to preparing, packaging, and shipping products to customers; and other costs of the Company’s distribution network. All shipping and handling costs billed to the customer are included as net sales in the Consolidated Statements of Earnings (Loss).
	Marketing and Administrative Expenses
	Marketing and administrative expenses include selling and administrative costs, including depreciation and amortization expense, not directly associated with the manufacture and distribution of the Company’s products.
	Included in marketing and administrative expenses are marketing and advertising costs, which are expensed the first time the advertisement takes place. Marketing and advertising costs include advertising, and marketing communications. Marketing and advertising expenses for the years ended December 31, 2014, 2013, and 2012 were $100 million, $105 million and $109 million, respectively.
	Science and Technology Expenses
	The Company incurs certain expenses related to science and technology. These expenses include salaries, building and equipment costs, utilities, administrative expenses, materials and supplies associated with the improvement and development of the Company’s products and manufacturing processes. These costs are expensed as incurred.
	Earnings (Loss) per Share
	Basic earnings (loss) per share are computed using the weighted-average number of common shares outstanding during the period. Diluted earnings (loss) per share reflect the dilutive effect of common equivalent shares and increased shares that would result from the conversion of equity securities. The effects of anti-dilution are not presented.
	Cash and Cash Equivalents
	The Company defines cash and cash equivalents as cash and time deposits with original maturities of three months or less when purchased.
	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful accounts is an estimate of the amount of probable credit losses in our existing accounts receivable. Account balances are charged off against the allowance when the Company believes it is probable the receivable will not be recovered.
	Inventory Valuation
	Inventory costs include material, labor, and manufacturing overhead costs, including depreciation and amortization expense associated with the manufacture and distribution of the Company’s products. Inventories are stated at lower of cost or market value and expense estimates are made for excess and obsolete inventories. Cost is determined by the first-in, first-out (“FIFO”) method.
	Investments in Affiliates
	The Company accounts for investments in affiliates of 20% to 50% ownership when the Company does not have a controlling financial interest using the equity method under which the Company’s share of earnings and losses of the affiliate is reflected in earnings and dividends are credited against the investment in affiliate when declared. Investments in affiliates are recorded in other non-current assets on the Consolidated Balance Sheets and as of December 31, 2014 and 2013 the total value of investments was $53 million and $51 million, respectively.
	Goodwill and Other Intangible Assets
	Goodwill assets are not amortized but are tested for impairment on at least an annual basis. In the current year, as part of the annual assessment, the Company used a quantitative approach to determine whether the fair value of a reporting unit was less than its carrying amount.
	As part of our testing process for goodwill the Company estimates fair values using a discounted cash flow approach from the perspective of a market participant. Significant estimates in the discounted cash flow approach are cash flow forecasts of our reporting units, the discount rate, the terminal business value and the projected income tax rate. The cash flow forecasts of the reporting units are based upon management’s long-term view of our markets and are the forecasts that are used by senior management and the Board of Directors to evaluate operating performance. The discount rate utilized is management’s estimate of what the market’s weighted average cost of capital is for a company with a similar debt rating and stock volatility, as measured by beta. The projected income tax rates utilized are the statutory tax rates for the countries where each reporting unit operates. The terminal business value is determined by applying a business growth factor to the latest year for which a forecast exists. As part of our goodwill quantitative testing process, we would evaluate whether there are reasonably likely changes to management’s estimates that would have a material impact on the results of the goodwill impairment testing.
	Other indefinite-lived intangible assets are not amortized but are tested for impairment on at least an annual basis or when determined to have a finite useful life. Substantially all of the indefinite-lived intangible assets are in trademarks and trade names. The Company uses the royalty relief approach to determine whether it is more likely than not that the fair value of these assets is less than its carrying amount. This review is performed annually, or when circumstances arise which indicate there may be impairment. When applying the royalty relief approach, the Company performs a discounted cash flow analysis based on the value derived from owning these trademarks and trade names and being relieved from paying royalty to third parties. Significant assumptions used include projected cash flows, discount rate, projected income tax rate and terminal business value. These inputs are considered Level 3 inputs under the fair value hierarchy as they are the Company’s own data, and are unobservable in the marketplace.
	Identifiable intangible assets with a determinable useful life are amortized over that determinable life. Amortization expense for the years ended December 31, 2014, 2013 and 2012 was $21 million, $22 million and $21 million, respectively. See Note 5 to the Consolidated Financial Statements for further discussion.
	Properties and Depreciation
	Property, plant and equipment are stated at cost and depreciated over their estimated useful lives using the straight-line method. Property, plant and equipment accounts are relieved of the cost and related accumulated depreciation when assets are disposed of or otherwise retired.
	Precious metals used in our production tooling are included in property, plant and equipment and are depleted as they are consumed during the production process. Depletion typically represents an annual expense of less than 3% of the outstanding value and is recorded in cost of sales on the Consolidated Statements of Earnings (Loss).
	For the years ended December 31, 2014, 2013 and 2012 depreciation expense was $283 million, $310 million and $328 million, respectively. In 2013, depreciation expense included $20 million of accelerated depreciation related to the change in useful life of assets recorded as a result of our assessment of the future utility of an incomplete Insulation facility located in Cordele, Georgia. In 2014 and 2013, depreciation expense included $1 million and $9 million of accelerated depreciation related to cost reduction actions further explained in Note 15 to the Consolidated Financial Statements. In 2014, depreciation expense also included $3 million of impairment losses on held for sale assets.
	The range of useful lives for the major components of the Company’s plant and equipment is as follows:
	Buildings and leasehold improvements	15 – 40 years
	Machinery and equipment
	Furnaces	4 – 15 years
	Information systems	5 – 10 years
	Equipment	5 – 20 years
	Expenditures for normal maintenance and repairs are expensed as incurred.
	Asset Impairments
	The Company evaluates tangible and intangible long-lived assets for impairment when triggering events have occurred. This requires significant assumptions including projected cash flows, projected income tax rate and terminal business value. These inputs are considered Level 3 inputs under the fair value hierarchy as they are the Company’s own data, and are unobservable in the marketplace. Changes in management intentions, market conditions or operating performance could indicate that impairment charges might be necessary that would be material to the Company’s Consolidated Financial Statements in any given period.
	Income Taxes
	The Company recognizes current tax liabilities and assets for the estimated taxes payable or refundable on the tax returns for the current year. Deferred tax balances reflect the impact of temporary differences between the carrying amount of assets and liabilities and their tax basis. Amounts are stated at enacted tax rates expected to be in effect when taxes are actually paid or recovered. In addition, realization of certain deferred tax assets is dependent upon our ability to generate future taxable income. The Company records a valuation allowance to reduce its deferred tax assets to the amount that it believes is more likely than not to be realized. In addition, the Company estimates tax reserves to cover potential taxing authority claims for income taxes and interest attributable to audits of open tax years.
	Taxes Collected from Customers and Remitted to Government Authorities and Taxes Paid to Vendors
	Taxes are assessed by various governmental authorities at different rates on many different types of transactions. The Company charges sales tax or Value Added Tax (“VAT”) on sales to customers where applicable, as well as captures and claims back all available VAT that has been paid on purchases. VAT is recorded in separate payable or receivable accounts and does not affect revenue or cost of sales line items in the income statement. VAT receivable is recorded as a percentage of qualifying purchases at the time the vendor invoice is processed. VAT payable is recorded as a percentage of qualifying sales at the time an Owens Corning sale to a customer subject to VAT occurs. Amounts are paid to the taxing authority according to the method and collection prescribed by local regulations. Where applicable, VAT payable is netted against VAT receivable. The Company also pays sales tax to vendors who include a tax, required by government regulations, to the purchase price charged to the Company.
	Pension and Other Postretirement Benefits
	Accounting for pensions and other postretirement benefits involves estimating the cost of benefits to be provided well into the future and attributing that cost over the time period each employee works. To accomplish this, extensive use is made of assumptions about investment returns, discount rates, inflation, mortality, turnover and medical costs.
	Derivative Financial Instruments
	The Company recognizes all derivative instruments as either assets or liabilities at fair value on the balance sheet. To the extent that a derivative is effective as a cash flow hedge, the change in fair value of the derivative is deferred in accumulated other comprehensive income/deficit (“OCI”). Any portion considered to be ineffective is reported in earnings immediately. To the extent that a derivative is effective as a fair value hedge, the change in the fair value of the derivative is offset by the change in the fair value of the item being hedged in the Consolidated Statements of Earnings (Loss). See Note 4 to the Consolidated Financial Statements for further discussion.
	Foreign Currency
	The functional currency of the Company’s subsidiaries is generally the applicable local currency. Assets and liabilities of foreign subsidiaries are translated into United States dollars at the period-end rate of exchange, and their Statements of Earnings (Loss) and Statements of Cash Flows are converted on an ongoing basis at the monthly average rate. The resulting translation adjustment is included in accumulated OCI in the Consolidated Balance Sheets and Consolidated Statements of Stockholders’ Equity. Transaction gains and losses that arise from exchange rate fluctuations on transactions denominated in a currency other than the functional currency are included in the Consolidated Statements of Earnings (Loss) as incurred. The Company recorded a foreign currency transaction loss of $4 million, a loss of $3 million and a gain of $5 million during the years ended December 31, 2014, 2013 and 2012, respectively.
	Accounting Pronouncements
In January 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" ("ASU 2014-08"). ASU 2014-08 changes the criteria for reporting discontinued operations and requires new disclosures for discontinued operations and for significant disposals of components of an entity that do not qualify for discontinued operations reporting. The adoption impacted the presentation of the consolidated financial statements related to disposals in 2014.
In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (“ASU 2014-09”). ASU 2014-09 outlines a new, single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. This new revenue recognition model provides a five-step analysis in determining when and how revenue is recognized. The new model will require revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration a company expects to receive in exchange for those goods or services. The Company is currently assessing the impact that adopting this new accounting guidance will have on its consolidated financial statements and footnote disclosures. ASU 2014-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is not permitted. Accordingly, the standard is effective for the Company on January 1, 2017.

SEGMENT_INFORMATION

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION
	In the fourth quarter of 2014, Owens Corning announced organizational changes to streamline the Company's management structure and reduce costs. As a a result of this action, the Building Materials Group organizational structure was eliminated. The new management structure contains three reportable segments: Composites, Insulation and Roofing. As a result, the 2013 and 2012 segment information in this Note has been presented to reflect the new structure. Accounting policies for the segments are the same as those for the Company. The Company’s three reportable segments are defined as follows:
	Composites – comprised of our Reinforcements and Downstream businesses. Within the Reinforcements business, the Company manufactures, fabricates and sells glass reinforcements in the form of fiber. Within the Downstream business, the Company manufactures and sells glass fiber products in the form of fabrics, mat, veil and other specialized products.
	Insulation – Within our Insulation business, the Company manufactures and sells fiberglass insulation into residential, commercial, industrial and other markets for both thermal and acoustical applications. It also manufactures and sells glass fiber pipe insulation, energy efficient flexible duct media, bonded and granulated mineral wool insulation and foam insulation used in above- and below-grade construction applications.
	Roofing – Within our Roofing business, the Company manufactures and sells residential roofing shingles and oxidized asphalt materials used in residential and commercial construction and specialty applications.
	As of December 31, 2013, the Total Assets table in this Note was revised to reflect the proper classification of $38 million of assets relating to the Composites reportable segment. These assets should have been reflected in Composites, however, they were presented in Corporate property, plant and equipment, other assets and eliminations. Consolidated Total Assets in this table was correctly stated as of December 31, 2013.
	NET SALES
	The following table summarizes our net sales by segment and geographic region (in millions). External customer sales are attributed to geographic region based upon the location from which the product is shipped to the external customer.
		Twelve Months Ended December 31,
		2014			2013			2012
	Reportable Segments
	Composites	$	1,935		$	1,845		$	1,859
	Insulation	1,746			1,642			1,468
	Roofing	1,748			1,967			2,014
	Total reportable segments	5,429			5,454			5,341
	Corporate eliminations	(153		)	(159		)	(169		)
	NET SALES	$	5,276		$	5,295		$	5,172
	External Customer Sales by Geographic Region
	United States	$	3,557		$	3,644		$	3,504
	Europe	575			545			558
	Asia Pacific	636			627			639
	Canada and other	508			479			471
	NET SALES	$	5,276		$	5,295		$	5,172
	EARNINGS BEFORE INTEREST AND TAXES
	Earnings before interest and taxes (“EBIT”) by segment consists of net sales less related costs and expenses and are presented on a basis that is used internally for evaluating segment performance. Certain items, such as general corporate expenses or income and certain other expense or income items, are excluded from the internal evaluation of segment performance. Accordingly, these items are not reflected in EBIT for our reportable segments and are included in the Corporate, Other and Eliminations category.
	The following table summarizes EBIT by segment (in millions):
		Twelve Months Ended December 31,
		2014			2013			2012
	Reportable Segments
	Composites	$	149		$	98		$	91
	Insulation	108			40			-38
	Roofing	232			386			331
	Total reportable segments	489			524			384
	Charges related to cost reduction actions	(37		)	(8		)	(51		)
	Other items related to cost reduction actions	1			(18		)	(85		)
	Net loss on sale of European Stone Business	(20		)	—			—
	Impairment loss on Alcala, Spain facility held for sale	(3		)	—			—
	Gain on sale of Hangzhou, China facility	45			—			—
	Net gain (loss) related to Hurricane Sandy insurance activity	(6		)	15			(9		)
	Accelerated depreciation related to a change in the useful life of assets at our incomplete Cordele, Georgia facility	—			(20		)	—
	General corporate expense	(77		)	(108		)	(91		)
	EBIT	$	392		$	385		$	148
	TOTAL ASSETS AND PROPERTY, PLANT AND EQUIPMENT BY GEOGRAPHIC REGION
	The following table summarizes total assets by segment and property, plant and equipment by geographic region (in millions):
		December 31,
	TOTAL ASSETS	2014			2013
	Reportable Segments
	Composites	$	2,387		$	2,417
	Insulation	2,844			2,858
	Roofing	1,138			1,153
	Total reportable segments	6,369			6,428
	Cash and cash equivalents	67			57
	Current and noncurrent Deferred income taxes	580			573
	Investments in affiliates	53			51
	Assets held for sale – current	16			29
	Corporate property, plant and equipment, other assets and eliminations	470			509
	CONSOLIDATED TOTAL ASSETS	$	7,555		$	7,647
		December 31,
	PROPERTY, PLANT AND EQUIPMENT BY GEOGRAPHIC REGION	2014			2013
	United States	$	1,773		$	1,688
	Europe	404			520
	Canada	111			131
	Asia Pacific	377			375
	Other	234			218
TOTAL PROPERTY, PLANT AND EQUIPMENT	$	2,899		$	2,932
PROVISION FOR DEPRECIATION AND AMORTIZATION
The following table summarizes the provision for depreciation and amortization by segment (in millions):
	Twelve Months Ended December 31,
	2014			2013			2012
Reportable Segments
Composites	$	129		$	130		$	123
Insulation	101			104			105
Roofing	39			38			38
Total reportable segments	269			272			266
General corporate depreciation and amortization (a)	35			60			83
CONSOLIDATED PROVISION FOR DEPRECIATION AND AMORTIZATION	$	304		$	332		$	349
(a)	2014 includes $1 million of accelerated depreciation related to our decision to close a facility in Japan and optimize a facility in Canada. 2013 includes $9 million of accelerated depreciation related to cost reduction actions and $20 million of accelerated depreciation related to the change in useful life of assets recorded as a result of our assessment of the future utility of an incomplete Insulation facility located in Cordele, Georgia. 2012 includes $55 million of accelerated depreciation charges related to cost reduction actions.
ADDITIONS TO PROPERTY, PLANT AND EQUIPMENT
The following table summarizes additions to property, plant and equipment by segment (in millions):
	Twelve Months Ended December 31,
	2014			2013			2012
Reportable Segments
Composites	$	239		$	155		$	167
Insulation	78			107			86
Roofing	41			60			41
Total reportable segments	358			322			294
General corporate additions	33			31			38
CONSOLIDATED ADDITIONS TO PROPERTY, PLANT AND EQUIPMENT	$	391		$	353		$	332

INVENTORIES

INVENTORIES	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES
	Inventories consist of the following (in millions):
		December 31,
		2014		2013
	Finished goods	$	568	$	580
	Materials and supplies	249		230
	Total inventories	$	817	$	810

DERIVATIVE_FINANCIAL_INSTRUMEN

DERIVATIVE FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS
	The Company is exposed to, among other risks, the impact of changes in commodity prices, foreign currency exchange rates, and interest rates in the normal course of business. The Company’s risk management program is designed to manage the exposure and volatility arising from these risks, and utilizes derivative financial instruments to offset a portion of these risks. The Company uses derivative financial instruments only to the extent necessary to hedge identified business risks, and does not enter into such transactions for trading purposes.
	The Company generally does not require collateral or other security with counterparties to these financial instruments and is therefore subject to credit risk in the event of nonperformance; however, the Company monitors credit risk and currently does not anticipate nonperformance by other parties. Contracts with counterparties generally contain right of offset provisions. These provisions effectively reduce the Company’s exposure to credit risk in situations where the Company has gain and loss positions outstanding with a single counterparty. It is the Company’s policy to offset on the Consolidated Balance Sheets the amounts recognized for derivative instruments with any cash collateral arising from derivative instruments executed with the same counterparty under a master netting agreement. As of December 31, 2014 and 2013, the Company did not have any amounts on deposit with any of its counterparties, nor did any of its counterparties have any amounts on deposit with the Company.
	The following table presents the fair value and respective location of derivatives and hedging instruments on the Consolidated Balance Sheets (in millions):
			Fair Value at
		Location	December 31, 2014			December 31, 2013
	Derivative assets designated as hedging instruments:
	Cash flow hedges:
	Natural gas, electricity, and foreign exchange contracts	Other current assets	$	—		$	1
	Amount of gain recognized in OCI (effective portion)	OCI	$	—		$	1
	Derivative liabilities designated as hedging instruments:
	Cash flow hedges:
	Natural gas, electricity, and foreign exchange contracts	Accounts payable and	$	9		$	—
		accrued liabilities
	Amount of loss recognized in OCI (effective portion)	OCI	$	8		$	—
	Fair value hedges:
	Interest rate swaps	Other Liabilities	$	(3	)	$	3
	Derivative assets not designated as hedging instruments:
	Foreign exchange contracts	Other current assets	$	1		$	—
	Derivative liabilities not designated as hedging instruments:
	Foreign exchange contracts	Accounts payable and	$	2		$	1
		accrued liabilities
	The following table presents the impact and respective location of derivative activities on the Consolidated Statements of Earnings (Loss) (in millions):
			Twelve Months Ended December 31,
		Location	2014			2013			2012
	Derivative activity designated as hedging instruments:
	Natural gas and electricity:
	Amount of loss reclassified from OCI into earnings (effective portion)	Cost of sales	$	—		$	1		$	5
	Interest rate swaps:
	Amount of (gain) loss recognized in earnings (ineffective portion)	Interest	$	—		$	(1	)	$	—
		expense, net
	Derivative activity not designated as hedging instruments:
	Natural gas and electricity:
	Amount of (gain) loss recognized in earnings	Other expenses	$	1		$	—		$	—
		(income), net
	Foreign currency exchange contract:
	Amount of (gain) loss recognized in earnings (a)	Other expenses	$	1		$	12		$	17
		(income), net
	(a)	(Gains) / losses related to foreign currency derivatives were substantially offset by net revaluation impacts on foreign denominated balance sheet exposures, which were also recorded in Other (income) expenses, net.
	Cash Flow Hedges
	The Company uses forward and swap contracts, which qualify as cash flow hedges, to manage forecasted exposure to natural gas and electricity prices. The effective portion of the change in the fair value of cash flow hedges is deferred in accumulated OCI on the Consolidated Balance Sheets and is subsequently recognized in cost of sales on the Consolidated Statements of Earnings (Loss) for commodity hedges, when the hedged item impacts earnings. Changes in the fair value of derivative assets and liabilities designated as hedging instruments are shown in other within operating activities on the Consolidated Statements of Cash Flows. Any portion of the change in fair value of derivatives designated as hedging instruments that is determined to be ineffective is recorded in other expenses (income), net on the Consolidated Statements of Earnings (Loss).
	The Company currently has natural gas derivatives designated as hedging instruments that mature within 15 months. The Company’s policy for natural gas exposures is to hedge up to 75 percent of its total forecasted exposures for the next two months, up to 60 percent of its total forecasted exposures for the following four months, and lesser amounts for the remaining periods. The Company's policy for electricity exposures is to hedge up to 75 percent of its total forecasted exposures for the current calendar year and up to 65 percent of its total forecasted exposures for the first calendar year forward. Based on market conditions, approved variation from the standard policy may occur. The Company performs an analysis for effectiveness of its derivatives designated as hedging instruments at the end of each quarter based on the terms of the contract and the underlying item being hedged.
	As of December 31, 2014, $8 million of loss included in OCI on the Consolidated Balance Sheets relate to contracts that will impact earnings during the next 12 months. Transactions and events that are expected to occur over the next 12 months that will necessitate recognizing these deferred gains include the recognition of the hedged item through earnings.
	Fair Value Hedges
	The Company manages its interest rate exposure by balancing the mix of its fixed and variable rate instruments at certain times through interest rate swaps. The swaps are carried at fair value and recorded as other assets or liabilities, with the offset to long-term debt on the Consolidated Balance Sheets. Changes in the fair value of these swaps and that of the related debt are recorded in interest expense, net on the Consolidated Statements of Earnings (Loss).
	Other Derivatives
	The Company uses forward currency exchange contracts to manage existing exposures to foreign exchange risk related to assets and liabilities recorded on the Consolidated Balance Sheets. Gains and losses resulting from the changes in fair value of these instruments are recorded in other expenses (income), net on the Consolidated Statements of Earnings (Loss).

GOODWILL_AND_OTHER_INTANGIBLE_

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS
	Intangible assets and goodwill consist of the following (in millions):
	31-Dec-14	Weighted		Gross				Accumulated				Net
		Average		Carrying				Amortization				Carrying
		Useful		Amount								Amount
		Life
	Amortizable intangible assets:
	Customer relationships	19		$	172			$	(72	)		$	100
	Technology	20		193				(83		)		110
	Franchise and other agreements	12		39				(18		)		21
	Indefinite-lived intangible assets:
	Trademarks			786				—				786
	Total intangible assets			$	1,190			$	(173	)		$	1,017
	Goodwill			$	1,168
	31-Dec-13	Weighted		Gross				Accumulated				Net
		Average		Carrying				Amortization				Carrying
		Useful		Amount								Amount
		Life
	Amortizable intangible assets:
	Customer relationships	19		$	181			$	(68	)		$	113
	Technology	20		194				(74		)		120
	Franchise and other agreements	14		37				(16		)		21
	Indefinite-lived intangible assets:
	Trademarks			786				—				786
	Total intangible assets			$	1,198			$	(158	)		$	1,040
	Goodwill			$	1,166
	The changes in the gross carrying amount of amortizable intangible assets by asset group are as follows (in millions):
		Customer relationships				Technology				Franchise and other agreements				Trademarks		Total
	Balance at December 31, 2013	$	181			$	194			$	37			$	786	$	1,198
	Acquisitions (see Note 9)	4				—				1				—		5
	Additional Franchises and Agreements	—				—				1				—		1
	Divestiture (see Note 10)	(13		)		(1		)		—				—		(14		)
	Balance at December 31, 2014	$	172			$	193			$	39			$	786	$	1,190
	The changes in the net carrying amount of goodwill by segment are as follows (in millions):
		Composites				Insulation				Roofing				Total
	Balance at December 31, 2013	$	57			$	886			$	223			$	1,166
	Acquisitions (see Note 9)	—				2				—				2
	Balance at December 31, 2014	$	57			$	888			$	223			$	1,168
	Other Intangible Assets
	The Company amortizes the cost of other intangible assets over their estimated useful lives, which range up to twenty-five years. The Company expects the ongoing amortization expense for amortizable intangible assets to be $22 million in each of the next five fiscal years. The Company’s future cash flows are not materially impacted by its ability to extend or renew agreements related to its amortizable intangible assets. These costs are reported in Other expenses (income), net on the Consolidated Statements of Earnings (Loss) as incurred.
	Goodwill and Indefinite-Lived Intangible Assets
	The Company tests goodwill and indefinite-lived intangible assets for impairment as of October 1 each year, or more frequently should circumstances change or events occur that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The annual test performed in 2014 resulted in no impairment of goodwill.

PROPERTY_PLANT_AND_EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment consist of the following (in millions):
		December 31, 2014			December 31, 2013
	Land	$	196		$	210
	Buildings and leasehold improvements	789			811
	Machinery and equipment	3,405			3,353
	Construction in progress	233			173
		4,623			4,547
	Accumulated depreciation	(1,724		)	(1,615		)
	Property, plant and equipment, net	$	2,899		$	2,932
	Machinery and equipment includes certain precious metals used in the Company’s production tooling, which comprise approximately 15 percent and 17 percent of total machinery and equipment as of December 31, 2014 and December 31, 2013, respectively. Precious metals used in our production tooling are depleted as they are consumed during the production process, which typically represents an annual expense of less than 3 percent of the outstanding carrying value.

CHANGES_IN_NONCONTROLLING_INTE

CHANGES IN NONCONTROLLING INTERESTS	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest [Abstract]
CHANGES IN NONCONTROLLING INTERESTS	CHANGES IN NONCONTROLLING INTERESTS
	In the third quarter of 2012, the Company executed a purchase agreement for the remaining noncontrolling interest of Northern Elastomeric Incorporated (“NEI”), one of the Company’s consolidated subsidiaries. As a result of the purchase agreement, NEI became a wholly-owned subsidiary of the Company, with the Company providing $22 million in cash consideration. The transaction resulted in a $6 million decrease in Noncontrolling interests on the Consolidated Balance Sheets.
	The following table discloses the changes in noncontrolling interests on Owens Corning stockholders’ equity and effects on net earnings attributable to Owens Corning (in millions):
		Twelve Months Ended December 31,
		2014		2013		2012
	Net earnings (loss) attributable to Owens Corning	$	226	$	204	$	(19	)
	Increase (decrease) in Owens Corning additional paid in capital for NEI purchase agreement	—		—		(16		)
	Change from net earnings (loss) attributable to Owens Corning and change in noncontrolling interests	$	226	$	204	$	(35	)

INVESTMENTS_IN_AFFILIATES

INVESTMENTS IN AFFILIATES	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
INVESTMENTS IN AFFILIATES	INVESTMENTS IN AFFILIATES
	At December 31, 2014 and 2013, the Company’s ownership percentage in affiliates, which generally are engaged in the manufacture of fibrous glass and related products for the insulation, construction, reinforcements, and textile markets, included:
		December 31,
		2014		2013
	Arabian Fiberglass Insulation Company, Ltd. (Saudi Arabia)	49	%	49	%
	Fiberteq LLC (United States)	50	%	50	%
	Neptco LLC (United States)	0	%	50	%
	In the fourth quarter of 2014, the Company sold its 50% ownership in Neptco for approximately $1 million.
	The following tables provide summarized financial information on a combined 100% basis for the Company’s affiliates accounted for under the equity method (in millions):
		December 31,
		2014			2013
	Current assets	$	50		$	50
	Non-current assets	$	91		$	90
	Current liabilities	$	36		$	25
	Non-current liabilities	$	11		$	23
		Twelve Months Ended December 31,
		2014			2013		2012
	Net sales	$	143		$	138	$	140
	Gross margin	$	11		$	7	$	11
	Net earnings	$	5		$	1	$	5
	Dividends received from entities are accounted for under the equity method. There were no dividends received for the years ended 2014, 2013 and 2012. There were no undistributed earnings of affiliates for the year ended December 31, 2014.

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS
	During the third quarter of 2014, the Company completed the acquisition of a building materials distribution company in Chile. The Company provided total consideration of $12 million comprised of cash payments of $7 million on September 4, 2014 and a put/call option with a strike price based on a 2016 EBITDA multiple exercisable in 2017. The fair value of the put/call option is $5 million and has been recorded in other liabilities on the Consolidated Balance Sheets. The acquisition resulted in the recognition of $4 million in intangible assets and $2 million in goodwill. The pro-forma effect of this acquisition on revenues and earnings was not material to the twelve months ended December 31, 2014.

DIVESTITURES

DIVESTITURES	12 Months Ended
	Dec. 31, 2014
Business Divestitures [Abstract]
DIVESTITURES	DIVESTITURES
	In the third quarter of 2014, the Company finalized the sale of its European Stone business in the Insulation segment to an unrelated third party. As a result of this sale, the Company received $2 million in consideration and recorded a pre-tax charge of $20 million in Other (income) expenses, net on the Consolidated Statements of Earnings (Loss).
	In the second quarter of 2014, the Company received final payment of $44 million related to the previously announced fourth quarter 2010 sale of our Masonry Products business in the Insulation segment to Boral Industries Ltd (“Boral”), an unrelated third party.
	On September 13, 2013, the Company signed an agreement to sell its Composites glass reinforcements facility in Hangzhou, People's Republic of China, for total consideration of approximately $70 million to the Hangzhou Municipal Land Reservation Center and the Development and Construction Management Office of Taoyuan New Zone of Gongshu District in Hangzhou (“Hangzhou Government”), both of which are unrelated third party government entities. In the first quarter of 2014, the Company returned the land to the Hangzhou Government and recorded a net gain of $45 million, which is recorded in Other (income) expenses, net on the Consolidated Statements of Earnings (Loss). The balance of the consideration, approximately $14 million, has been recorded in Other current assets on the Consolidated Balance Sheets. Final payment is due upon the Hangzhou government’s completion of demolition activities, currently forecast for the second half of 2015.

ASSETS_HELD_FOR_SALE

ASSETS HELD FOR SALE	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
ASSETS HELD FOR SALE	ASSETS HELD FOR SALE
	During 2014, the Company closed its Alcala, Spain facility. The assets held for sale consisted of $9 million of Property, Plant and Equipment. There are no other assets or liabilities held for sale related to this facility as of December 31, 2014. During 2013, the Company closed its Vado, Italy facility. The assets held for sale consisted of $7 million of Property, Plant and Equipment. There were no other assets or liabilities held for sale related to this facility as of December 31, 2014. Both closures were a part of the 2012 Composites cost reductions actions. In the first quarter of 2014, the Company recognized the sale of its Composites glass reinforcements facility in Hangzhou, People's Republic of China, for which $21 million of Property, Plant and Equipment was held for sale as of December 31, 2013.

OPERATING_LEASES

OPERATING LEASES	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
OPERATING LEASES	OPERATING LEASES
	The Company leases certain equipment and facilities under operating leases expiring on various dates through 2023. Some of these leases include cost-escalation clauses. Such cost-escalation clauses are recognized on a straight-line basis over the lease term. Total rental expense was $91 million, $83 million and $79 million in the years ended December 31, 2014, 2013 and 2012, respectively. At December 31, 2014, the minimum future rental commitments under non-cancelable operating leases with initial maturities greater than one year payable over the remaining lives of the leases are (in millions):
	Period	Minimum
		Future Rental
		Commitments
	2015	$	53
	2016	$	44
	2017	$	32
	2018	$	20
	2019	$	14
	2020 and beyond	$	37

ACCOUNTS_PAYABLE_AND_ACCRUED_L

ACCOUNTS PAYABLE AND ACCRUED LIABILITIES	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES	ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
	Accounts payable and accrued liabilities consist of the following (in millions):
		December 31,
		2014		2013
	Accounts payable	$	542	$	547
	Payroll, vacation pay, and incentive compensation	112		161
	Payroll, property, and other taxes	93		95
	Other employee benefits liabilities	38		39
	Dividends payable	19		—
	Warranties (current portion)	17		19
	Legal and audit fees	8		7
	Accrued interest	9		8
	Charges related to cost reduction actions	36		32
	Deferred acquisition payments	—		5
	Other	75		75
	Total	$	949	$	988

WARRANTIES

WARRANTIES	12 Months Ended
	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
WARRANTIES	WARRANTIES
	The Company records a liability for warranty obligations at the date the related products are sold. Adjustments are made as new information becomes available. A reconciliation of the warranty liability is as follows (in millions):
		December 31,
		2014			2013
	Beginning balance	$	41		$	41
	Amounts accrued for current year	25			23
	Settlements of warranty claims	(26		)	(23		)
	Ending balance	$	40		$	41

COST_REDUCTION_ACTIONS

COST REDUCTION ACTIONS	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
COST REDUCTION ACTIONS	COST REDUCTION ACTIONS
	2014 Cost Reduction Actions
	In the fourth quarter of 2014, the Company announced organizational changes to streamline its management structure and reduce costs. As part of this action, the Building Materials Group organizational structure was eliminated. In conjunction with these actions, the Company recognized $9 million in severance charges.
	The Company took actions in 2014 to reduce costs in its Composites segment. For the twelve months ended December 31, 2014, these actions related to our decision to not rebuild two sub-scale high cost furnaces that will result in closing a facility in Japan and optimizing a facility in Canada. As a result of these actions, the Company recognized $16 million in severance charges, $3 million in contract termination charges, and $1 million net gain in other related charges.
	In addition, in the first quarter of 2014, the Company took actions in our Composites segment related to global workforce reductions and the termination of a contract with a utility services provider. In conjunction with these actions, the Company recorded $14 million in charges related to cost reduction actions of which $11 million is related to severance and $3 million is related to contract termination charges. During the fourth quarter of 2014, the charges related to contract termination were recovered through a settlement. There were no additional costs incurred for severance in remaining quarters.
	The following table summarizes the status of the unpaid liabilities from the Company’s 2014 cost reduction actions (in millions):
		Beginning		Costs			Payments		Foreign Currency Translation			Ending		Cumulative
		Balance		Incurred								Balance		Charges
		December 31,										December 31,		Incurred
		2013										2014
	Severance	$	—	$	36		$	3	$	(2	)	$	31	$	36
	Contract Termination	—		3			—		—			3		3
	Total	$	—	$	39		$	3	$	(2	)	$	34	$	39
	The Company expects the unpaid balance of these severance and contract termination charges to be paid over the next year.
	2013 Cost Reduction Actions
	As a result of the Company’s decision to divest its Composites glass reinforcements facility in Hangzhou, Peoples Republic of China discussed in Note 10 to the Consolidated Financial Statements, we have recorded $6 million in charges related to cost reduction actions on the Consolidated Statements of Earnings (Loss) for the twelve months ended December 31, 2013. In the first quarter of 2014, the Company revised it estimated total severance costs of this action by $2 million. There were no additional costs incurred in 2014.
	The following table summarizes the status of the unpaid liabilities from the Company’s 2013 cost reduction actions (in millions):
		Beginning		Costs			Payments		Foreign Currency Translation			Ending		Cumulative
		Balance		Incurred								Balance		Charges
		December 31,										December 31,		Incurred
		2013										2014
	Severance	$	6	$	(2	)	$	4	$	—		$	—	$	4
	Total	$	6	$	(2	)	$	4	$	—		$	—	$	4
	2012 Cost Reduction Actions
	The following table summarizes the status of the unpaid liabilities from the Company’s 2012 cost reduction actions (in millions):
		Beginning		Costs			Payments		Foreign Currency Translation			Ending		Cumulative
		Balance		Incurred								Balance		Charges
		December 31,										December 31,		Incurred
		2013										2014
	Severance	$	26	$	—		$	23	$	(1	)	$	2	$	53
	Total	$	26	$	—		$	23	$	(1	)	$	2	$	53
	The Company expects the unpaid balance of these severance charges to be paid within the next twelve months.

DEBT

DEBT	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
DEBT	DEBT
	Details of the Company’s outstanding long-term debt are as follows (in millions):
		December 31, 2014		December 31, 2013
	6.50% senior notes, net of discount, due 2016	$	158	$	400
	9.00% senior notes, net of discount, due 2019	143		248
	4.20% senior notes, net of discount, due 2022	600		599
	4.20% senior notes, net of discount, due 2024	392		—
	7.00% senior notes, net of discount, due 2036	540		540
	Accounts receivable securitization facility, maturing in 2016	106		162
	Senior revolving credit facility, maturing in 2018	—		12
	Various capital leases, due through and beyond 2050	47		49
	Various floating rate debt, maturing through 2017	—		1
	Fair value adjustment to debt	8		16
	Total long-term debt	1,994		2,027
	Less – current portion	3		3
	Long-term debt, net of current portion	$	1,991	$	2,024
	Senior Notes
	The Company issued $400 million of 2024 senior notes on November 12, 2014 at 4.20%. The Company paid $4 million in loan costs in connection with the 2024 notes. These costs were deferred and are being amortized over the term of the 2024 notes. Interest on the notes is payable semiannually in arrears on June 1 and December 1 each year, beginning on June 1, 2015.
	The proceeds of these notes were used to repay $242 million of our 2016 senior notes at an average price equal to 111.46% of the principal amount, together with accrued interest of $7 million. In addition, the Company repaid $105 million of our 2019 senior notes at an average price equal to 122.98% of the principal amount, together with accrued interest of $4 million. The cash premium paid totaled $52 million and is included in Payments on long-term debt in the Consolidated Statement of Cash Flows. Unamortized discounts and fees of $2 million along with tender fees of $1 million were recorded in Loss on extinguishment of debt in the Consolidated Statement of Earnings (Loss). The remaining funds were used to pay down our Senior Revolving Credit Facility, finance general working capital needs, and for general corporate purposes.
	The Company issued $600 million of 2022 senior notes on October 17, 2012. The proceeds of these notes were used to refinance $250 million of our 2016 senior notes, $100 million of our 2019 senior notes and pay down our Senior Revolving Credit Facility. Interest on the notes is payable semiannually in arrears on June 15 and December 15 each year, beginning on June 15, 2013.
	The Company issued $350 million of 2019 senior notes on June 3, 2009. On October 31, 2006, the Company issued $650 million of 2016 senior notes and $540 million of 2036 senior notes. The proceeds of these notes were used to pay certain unsecured and administrative claims, finance general working capital needs and for general corporate purposes.
	Collectively, the notes above are referred to as the “Senior Notes.” The Senior Notes are general unsecured obligations of the Company and rank pari passu with all existing and future senior unsecured indebtedness of the Company.
	The Senior Notes are fully and unconditionally guaranteed by each of the Company’s current and future domestic subsidiaries that are a borrower or guarantor under the Company’s Credit Agreement (as defined below). The guarantees are unsecured and rank equally in right of payment with all other existing and future senior unsecured indebtedness of the guarantors. The guarantees are effectively subordinated to existing and future secured debt of the guarantors to the extent of the assets securing that indebtedness.
	The Company has the option to redeem all or part of the Senior Notes at any time at a “make whole” redemption price. The Company is subject to certain covenants in connection with the issuance of the Senior Notes that it believes are usual and customary. The Company was in compliance with these covenants as of December 31, 2014.
	In the fourth quarter of 2011, the Company terminated all interest rate swaps designated to hedge a portion of the 6.5% senior notes due 2016. The swaps were carried at fair value and recorded as other assets or liabilities, with a fair value adjustment to long-term debt on the Consolidated Balance Sheets. The fair value adjustment to debt will be amortized through 2016 as a reduction to interest expense in conjunction with the maturity date of the notes.
	On June 28, 2013, the Company entered into interest rate swap agreements effective July 1, 2013 to manage its interest rate exposure by swapping $100 million of fixed rate to variable rate exposure designated against our 4.2% senior notes due 2022. The swaps are carried at fair value and recorded as other assets or liabilities, with a fair value adjustment to long-term debt on the Consolidated Balance Sheets.
	Senior Credit Facilities
	In November 2013, the Company amended the credit agreement (the “Credit Agreement”) for the $800 million multi-currency senior revolving credit facility (the “Senior Revolving Credit Facility”) to extend the maturity to November 2018 and reduce the letters of credit sublimit to $100 million. The Senior Revolving Credit Facility includes both borrowings and letters of credit. Borrowings under the Senior Revolving Credit Facility may be used for general corporate purposes and working capital. The Company has the discretion to borrow under multiple options, which provide for varying terms and interest rates including the United States prime rate or LIBOR plus a spread.
	The Senior Revolving Credit Facility contains various covenants, including a maximum allowed leverage ratio and a minimum required interest expense coverage ratio that the Company believes are usual and customary for a senior unsecured credit agreement. The Company was in compliance with these covenants as of December 31, 2014.
	The Company had $9 million of letters of credit outstanding under the Senior Revolving Credit Facility at December 31, 2014.
	Receivables Securitization Facility
	Included in long-term debt on the Consolidated Balance Sheets are amounts outstanding under a Receivables Purchase Agreement (the “RPA”) that are accounted for as secured borrowings in accordance with ASC 860, Accounting for Transfers and Servicing. Owens Corning Sales, LLC and Owens Corning Receivables LLC, each a subsidiary of the Company, have a $250 million RPA with certain financial institutions. The securitization facility was amended in November of 2013 to extend its maturity to July 2016 and to reduce the size of the facility to $200 million during the months of November, December, and January. The securitization facility was amended in January of 2015 to extend its maturity to January 2018 and remove the seasonal reduction of the facility restoring the full $250 million of facility capacity during the months of November, December, and January. At December 31, 2014 the Company had $106 million in borrowings from the receivables securitization facility. The Company had $38 million of letters of credit outstanding under the receivables securitization facility at December 31, 2014.
	The RPA contains various covenants, including a maximum allowed leverage ratio and a minimum required interest expense coverage ratio that the Company believes are usual and customary for a securitization facility. The Company was in compliance with these covenants as of December 31, 2014.
	Owens Corning Receivables LLC’s sole business consists of the purchase or acceptance through capital contributions of trade receivables and related rights from Owens Corning Sales, LLC and the subsequent retransfer of or granting of a security interest in such trade receivables and related rights to certain purchasers party to the RPA. Owens Corning Receivables LLC is a separate legal entity with its own separate creditors who will be entitled, upon its liquidation, to be satisfied out of Owens Corning Receivables LLC’s assets prior to any assets or value in Owens Corning Receivables LLC becoming available to Owens Corning Receivables LLC’s equity holders. The assets of Owens Corning Receivables LLC are not available to pay creditors of the Company or any other affiliates of the Company or Owens Corning Sales, LLC.
	Debt Maturities
	The aggregate maturities for all long-term debt issues for each of the five years following December 31, 2014 and thereafter are presented in the table below (in millions). The maturities are stated at total cash the Company is contractually obligated to pay third parties and are not stated net of discount. The effects of the interest rate swap are not included in the table below.
	Period	Maturities
	2015	$	7
	2016	269
	2017	4
	2018	4
	2019	147
	2020 and beyond	1,563
	Total	$	1,994
	Short-Term Debt
	At December 31, 2014 and December 31, 2013, short-term borrowings were $31 million and $1 million, respectively. The short-term borrowings for both periods consisted of various operating lines of credit and working capital facilities. Certain of these borrowings are collateralized by receivables, inventories or property. The borrowing facilities are typically for one-year renewable terms. The weighted average interest rate on all short-term borrowings was approximately 7.2% for December 31, 2014 and 2.2% for December 31, 2013.

PENSION_PLANS

PENSION PLANS	12 Months Ended
	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
PENSION PLANS	PENSION PLANS
	The Company sponsors defined benefit pension plans. Under the plans, pension benefits are based on an employee’s years of service and, for certain categories of employees, qualifying compensation. Company contributions to these pension plans are determined by an independent actuary to meet or exceed minimum funding requirements. In our U.S. plan prior to 2013 and in all of our Non-U.S plans, the unrecognized cost of any retroactive amendments and actuarial gains and losses are amortized over the average future service period of plan participants expected to receive benefits. As of January 1, 2013, an increase in the number of inactive participants in our U.S. plan resulted in substantially all of the plan participants being inactive. Accordingly, the Company began amortizing the unrecognized cost of any retroactive amendments and actuarial gains and losses over the average remaining life expectancy of the inactive participants as opposed to the average remaining service period of the active participants.
	The following tables provide a reconciliation of the change in the projected benefit obligation, the change in plan assets and the net amount recognized in the Consolidated Balance Sheets for the years ended December 31, 2014 and 2013 (in millions):
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Change in Projected Benefit Obligation
	Benefit obligation at beginning of period	$	1,070			$	546			$	1,616			$	1,187		$	554		$	1,741
	Service cost	8				5				13				9			6			15
	Interest cost	48				23				71				44			21			65
	Actuarial (gain) loss	159				63				222				(91		)	3			(88		)
	Currency (gain) loss	—				(44		)		(44		)		—			(8		)	(8		)
	Benefits paid	(92		)		(23		)		(115		)		(79		)	(21		)	(100		)
	Settlements / Curtailments	—				(2		)		(2		)		—			(7		)	(7		)
	Other	—				(4		)		(4		)		—			(2		)	(2		)
	Benefit obligation at end of period	$	1,193			$	564			$	1,757			$	1,070		$	546		$	1,616
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Change in Plan Assets
	Fair value of assets at beginning of period	$	858			$	422			$	1,280			$	856		$	404		$	1,260
	Actual return on plan assets	82				50				132				60			35			95
	Currency gain (loss)	—				(35		)		(35		)		—			(9		)	(9		)
	Company contributions	36				16				52				20			20			40
	Benefits paid	(92		)		(23		)		(115		)		(79		)	(21		)	(100		)
	Settlements/curtailments	—				(2		)		(2		)		—			(7		)	(7		)
	Other	(1		)		2				1				1			—			1
	Fair value of assets at end of period	$	883			$	430			$	1,313			$	858		$	422		$	1,280
	Funded status	$	(310	)		$	(134	)		$	(444	)		$	(212	)	$	(124	)	$	(336	)
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Amounts Recognized in the Consolidated Balance Sheets
	Prepaid pension cost	$	—			$	5			$	5			$	—		$	2		$	2
	Accrued pension cost – current	(1		)		(1		)		(2		)		—			(2		)	(2		)
	Accrued pension cost – non-current	(309		)		(138		)		(447		)		(212		)	(124		)	(336		)
	Net amount recognized	$	(310	)		$	(134	)		$	(444	)		$	(212	)	$	(124	)	$	(336	)
	Amounts Recorded in Accumulated OCI
	Net actuarial loss	$	(415	)		$	(107	)		$	(522	)		$	(289	)	$	(78	)	$	(367	)
	The following table presents information about the projected benefit obligation, accumulated benefit obligation (“ABO”) and plan assets of the Company’s pension plans (in millions):
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Plans with ABO in excess of fair value
	of plan assets:
	Projected benefit obligation	$	1,193			$	457			$	1,650			$	1,070		$	414		$	1,484
	Accumulated benefit obligation	$	1,193			$	441			$	1,634			$	1,070		$	400		$	1,470
	Fair value of plan assets	$	883			$	321			$	1,204			$	858		$	293		$	1,151
	Plans with fair value of assets in excess of ABO:
	Projected benefit obligation	$	—			$	107			$	107			$	—		$	132		$	132
	Accumulated benefit obligation	$	—			$	99			$	99			$	—		$	121		$	121
	Fair value of plan assets	$	—			$	109			$	109			$	—		$	129		$	129
	Total projected benefit obligation	$	1,193			$	564			$	1,757			$	1,070		$	546		$	1,616
	Total accumulated benefit obligation	$	1,193			$	540			$	1,733			$	1,070		$	521		$	1,591
	Total plan assets	$	883			$	430			$	1,313			$	858		$	422		$	1,280
	Weighted-Average Assumptions Used to Determine Benefit Obligation
	The following table presents weighted average assumptions used to determine benefit obligations at the measurement dates noted:
		December 31,
		2014			2013
	United States Plans
	Discount rate	3.85	%		4.65	%
	Expected return on plan assets	7	%		7	%
	Non-United States Plans
	Discount rate	3.6	%		4.45	%
	Expected return on plan assets	6.27	%		6.38	%
	Rate of compensation increase	4.01	%		3.94	%
	Components of Net Periodic Pension Cost
	The following table presents the components of net periodic pension cost for the periods noted (in millions):
	Twelve Months Ended December 31,
	2014				2013				2012
Service cost	$	13			$	15			$	15
Interest cost	71				65				72
Expected return on plan assets	(84		)		(84		)		(86		)
Amortization of actuarial loss	11				20				29
Net periodic benefit cost	$	11			$	16			$	30
Weighted-Average Assumptions Used to Determine Net Periodic Pension Cost
The following table presents weighted-average assumptions used to determine net periodic pension costs for the periods noted:
	Twelve Months Ended December 31,
	2014					2013					2012
United States Plans
Discount rate	4.65	%				3.8	%				4.6	%
Expected return on plan assets	7	%				7.5	%				7.25	%
Rate of compensation increase	N/A			(a)		N/A			(a)		N/A			(a)
Non-United States Plans
Discount rate	4.45	%				4.1	%				4.65	%
Expected return on plan assets	6.38	%				6.13	%				7.23	%
Rate of compensation increase	3.94	%				3.5	%				3.75	%
(a)	Not applicable due to changes in plan made on August 1, 2009 that were effective beginning January 1, 2010.
The expected return on plan assets assumption is derived by taking into consideration the target plan asset allocation, historical rates of return on those assets, projected future asset class returns and net outperformance of the market by active investment managers. An asset return model is used to develop an expected range of returns on plan investments over a 20 year period, with the expected rate of return selected from a best estimate range within the total range of projected results. The result is then rounded down to the nearest 25 basis points.
Accumulated Other Comprehensive Earnings (Deficit)
For the year ended December 31, 2014, the Company recorded a debit of $94 million, net of tax, to OCI. Of the $(522) million balance in OCI, $19 million is expected to be recognized as net periodic pension cost during 2015. For the year ended December 31, 2013, the Company recorded a charge of $81 million, net of tax, to OCI.
Items Measured at Fair Value
The Company classifies and discloses pension plan assets in one of the following three categories:
Level 1: Quoted market prices in active markets for identical assets.
Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.
Level 3: Unobservable inputs that are not corroborated by market data.
Plan Assets
The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall under United States pension plan assets at December 31, 2014 and 2013 (in millions):
	2014
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	99			$	39			$	—			$	138
Domestic passive index	—				61				—				61
International actively managed	81				34				—				115
International passive index	—				26				—				26
Fixed income and cash equivalents
Cash	2				—				—				2
Short-term debt	—				26				—				26
Corporate bonds	229				55				—				284
Government debt	98				—				—				98
Real estate investment trusts	28				—				—				28
Absolute return strategies	—				55				—				55
Real assets	—				50				—				50
Total United States plan assets	$	537			$	346			$	—			$	883
	2013
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	100			$	38			$	—			$	138
Domestic passive index	—				58				—				58
International actively managed	85				36				—				121
International passive index	—				25				—				25
Fixed income and cash equivalents
Short-term debt	—				27				—				27
Corporate bonds	213				54				—				267
Government debt	91				—				—				91
Real estate investment trusts	26				—				—				26
Absolute return strategies	—				80				—				80
Real assets	—				25				—				25
Total United States plan assets	$	515			$	343			$	—			$	858
The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall under non-United States pension plan assets at December 31, 2014 and 2013 (in millions):
	2014
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	—			$	30			$	—			$	30
Domestic passive index	—				—				—				—
International actively managed	—				51				—				51
International passive index	—				35				—				35
Fixed income and cash equivalents
Cash and cash equivalents	—				28				—				28
Corporate bonds	—				193				—				193
Government Debt	—				—				—				—
Absolute return strategies	—				93				—				93
Total non-United States plan assets	$	—			$	430			$	—			$	430
	2013
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	—			$	34			$	—			$	34
Domestic passive index	—				4				—				4
International actively managed	—				61				—				61
International passive index	—				28				—				28
Fixed income and cash equivalents
Cash and cash equivalents	3				22				—				25
Corporate bonds	—				162				—				162
Government Debt	—				7				—				7
Absolute return strategies	—				101				—				101
Total non-United States plan assets	$	3			$	419			$	—			$	422
Investment Strategy
The current investment policy for the United States pension plan is to have 38% of assets invested in equities, 3% in real estate, 6% in real assets, and 47% in intermediate and long-term fixed income securities, and 6% in absolute return strategies. Assets are rebalanced quarterly to conform to policy tolerances. The Company actively evaluates the reasonableness of its asset mix given changes in the projected benefit obligation and market dynamics.
Estimated Future Benefit Payments
The following table shows estimated future benefit payments from the Company’s pension plans (in millions):
Year		Estimated
		Benefit
		Payments
2015		$106
2016		$102
2017		$103
2018		$101
2019		$103
2020-2023		$509
Contributions
Owens Corning expects to contribute $48 million in cash to the United States pension plan during 2015 and another $14 million to non-United States plans. Actual contributions to the plans may change as a result of a variety of factors, including changes in laws that impact funding requirements.
Defined Contribution Plans
The Company sponsors two defined contribution plans which are available to substantially all United States employees. The Company matches a percentage of employee contributions up to a maximum level and contributes 2% of an employee’s wages regardless of employee contributions. The Company recognized expense of $34 million, $29 million and $30 million during the years ended December 31, 2014, 2013 and 2012, respectively, related to these plans.
POSTEMPLOYMENT AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS
The Company maintains health care and life insurance benefit plans for certain retired employees and their dependents. The health care plans in the United States are non-funded and pay either (1) stated percentages of covered medically necessary expenses, after subtracting payments by Medicare or other providers and after stated deductibles have been met, or (2) fixed amounts of medical expense reimbursement.
Employees become eligible to participate in the United States health care plans upon retirement if they have accumulated 10 years of service after age 45, 48 or 50, depending on the category of employee. For employees hired after December 31, 2005, the Company does not provide subsidized retiree health care. Some of the plans are contributory, with some retiree contributions adjusted annually. The Company has reserved the right to change or eliminate these benefit plans subject to the terms of collective bargaining agreements.
The Company implemented an Employee Group Waiver Plan (EGWP) effective January 1, 2013 to manage its prescription drug benefits for certain retiree groups. The Company also negotiated with certain unionized employees to increase the eligibility age for retiree medical benefits and to eliminate the post-65 retiree reimbursement account benefit for employees retiring on or after January 1, 2014.
The following table provides a reconciliation of the change in the projected benefit obligation and the net amount recognized in the Consolidated Balance Sheets for the years ended December 31, 2014 and 2013 (in millions):
	December 31, 2014												December 31, 2013
	U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
Change in Projected Benefit Obligation
Benefit obligation at beginning of period	$	228			$	16			$	244			$	252		$	21		$	273
Service cost	2				—				2				2			1			3
Interest cost	9				1				10				8			1			9
Actuarial loss (gain)	17				—				17				(18		)	(2		)	(20		)
Currency loss (gain)	—				(1		)		(1		)		—			—			—
Plan amendments	—				—				—				—			—			—
Benefits paid	(18		)		(1		)		(19		)		(18		)	(2		)	(20		)
Other	—				1				1				2			(3		)	(1		)
Benefit obligation at end of period	$	238			$	16			$	254			$	228		$	16		$	244
Funded status	$	(238	)		$	(16	)		$	(254	)		$	(228	)	$	(16	)	$	(244	)
Amounts Recognized in the Consolidated
Balance Sheets
Accrued benefit obligation – current	$	(18	)		$	(1	)		$	(19	)		$	(20	)	$	—		$	(20	)
Accrued benefit obligation – non-current	(220		)		(15		)		(235		)		(208		)	(16		)	(224		)
Net amount recognized	$	(238	)		$	(16	)		$	(254	)		$	(228	)	$	(16	)	$	(244	)
Amounts Recorded in Accumulated OCI
Net actuarial gain	$	(20	)		$	—			$	(20	)		$	21		$	6		$	27
Net prior service credit	(2		)		(5		)		(7		)		24			—			24
Net amount recognized	$	(22	)		$	(5	)		$	(27	)		$	45		$	6		$	51
Weighted-Average Assumptions Used to Determine Benefit Obligations
The following table presents the discount rates used to determine the benefit obligations:
	December 31,
	2014			2013
United States plans	3.7	%		4.35	%
Non-United States plans	3.7	%		4.45	%
Components of Net Periodic Postretirement Benefit Cost
The following table presents the components of net periodic postretirement benefit cost (in millions):
	Twelve Months Ended December 31,
	2014				2013				2012
Service cost	$	2			$	3			$	3
Interest cost	10				9				11
Amortization of prior service cost	(4		)		(4		)		(4		)
Amortization of actuarial gain	(2		)		(1		)		(3		)
Curtailment gain	—				—				(1		)
Net periodic postretirement benefit cost	$	6			$	7			$	6
Weighted-Average Assumptions Used to Determine Net Periodic Postretirement Benefit Cost
The following table presents the discount rates used to determine net periodic postretirement benefit cost:
	Twelve Months Ended December 31,
	2014			2013			2012
United States plans	4.35	%		3.5	%		4.35	%
Non-United States plans	4.45	%		3.8	%		4.1	%
The following table presents health care cost trend rates used to determine net periodic postretirement benefit cost, as well as information regarding the ultimate rate and the year in which their ultimate rate is reached:
	Twelve Months Ended December 31,
	2014			2013			2012
United States plans
Initial rate at end of year	7	%		7	%		7	%
Ultimate rate	5	%		5	%		5	%
Year in which ultimate rate is reached	2024			2023			2022
Non-United States plans
Initial rate at end of year	5.43	%		6.23	%		6.5	%
Ultimate rate	4.7	%		4.79	%		4.8	%
Year in which ultimate rate is reached	2019			2019			2019
The health care cost trend rate assumption can have a significant effect on the amounts reported. To illustrate, a one-percentage point change in the December 31, 2014 assumed health care cost trend rate would have the following effects (in millions):
	1-Percentage Point
	Increase				Decrease
Increase (decrease) in total service cost and interest cost components of net periodic postretirement benefit cost	$	1			$	—
Increase (decrease) of accumulated postretirement benefit obligation	$	10			$	(8	)
Accumulated Other Comprehensive Earnings (Deficit)
For the year ended December 31, 2014, the Company recorded other comprehensive loss of $(13) million, net of tax, to OCI. Approximately $4 million of the $27 million balance in accumulated OCI is expected to be recognized as net periodic postretirement benefit during 2015. For the year ended December 31, 2013, the Company recorded other comprehensive income of $7 million, net of tax, to OCI.
Estimated Future Benefit Payments
The following table shows estimated future benefit payments from the Company’s postretirement benefit plans (in millions):
Year	Estimated
	Benefit
	Payments
2015	$	19
2016	$	20
2017	$	20
2018	$	19
2019	$	19
2020-2024	$	88
Postemployment Benefits
The Company may also provide benefits to former or inactive employees after employment but before retirement under certain conditions. These benefits include continuation of benefits such as health care and life insurance coverage. The accrued postemployment benefits liability at December 31, 2014 and 2013 was $17 million and $18 million, respectively. The net periodic postemployment benefit expense was $1 million for each of the years ended December 31, 2014, 2013 and 2012.

POSTEMPLOYMENT_AND_POSTRETIREM

POSTEMPLOYMENT AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS	12 Months Ended
	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
POSTEMPLOYMENT AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS	PENSION PLANS
	The Company sponsors defined benefit pension plans. Under the plans, pension benefits are based on an employee’s years of service and, for certain categories of employees, qualifying compensation. Company contributions to these pension plans are determined by an independent actuary to meet or exceed minimum funding requirements. In our U.S. plan prior to 2013 and in all of our Non-U.S plans, the unrecognized cost of any retroactive amendments and actuarial gains and losses are amortized over the average future service period of plan participants expected to receive benefits. As of January 1, 2013, an increase in the number of inactive participants in our U.S. plan resulted in substantially all of the plan participants being inactive. Accordingly, the Company began amortizing the unrecognized cost of any retroactive amendments and actuarial gains and losses over the average remaining life expectancy of the inactive participants as opposed to the average remaining service period of the active participants.
	The following tables provide a reconciliation of the change in the projected benefit obligation, the change in plan assets and the net amount recognized in the Consolidated Balance Sheets for the years ended December 31, 2014 and 2013 (in millions):
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Change in Projected Benefit Obligation
	Benefit obligation at beginning of period	$	1,070			$	546			$	1,616			$	1,187		$	554		$	1,741
	Service cost	8				5				13				9			6			15
	Interest cost	48				23				71				44			21			65
	Actuarial (gain) loss	159				63				222				(91		)	3			(88		)
	Currency (gain) loss	—				(44		)		(44		)		—			(8		)	(8		)
	Benefits paid	(92		)		(23		)		(115		)		(79		)	(21		)	(100		)
	Settlements / Curtailments	—				(2		)		(2		)		—			(7		)	(7		)
	Other	—				(4		)		(4		)		—			(2		)	(2		)
	Benefit obligation at end of period	$	1,193			$	564			$	1,757			$	1,070		$	546		$	1,616
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Change in Plan Assets
	Fair value of assets at beginning of period	$	858			$	422			$	1,280			$	856		$	404		$	1,260
	Actual return on plan assets	82				50				132				60			35			95
	Currency gain (loss)	—				(35		)		(35		)		—			(9		)	(9		)
	Company contributions	36				16				52				20			20			40
	Benefits paid	(92		)		(23		)		(115		)		(79		)	(21		)	(100		)
	Settlements/curtailments	—				(2		)		(2		)		—			(7		)	(7		)
	Other	(1		)		2				1				1			—			1
	Fair value of assets at end of period	$	883			$	430			$	1,313			$	858		$	422		$	1,280
	Funded status	$	(310	)		$	(134	)		$	(444	)		$	(212	)	$	(124	)	$	(336	)
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Amounts Recognized in the Consolidated Balance Sheets
	Prepaid pension cost	$	—			$	5			$	5			$	—		$	2		$	2
	Accrued pension cost – current	(1		)		(1		)		(2		)		—			(2		)	(2		)
	Accrued pension cost – non-current	(309		)		(138		)		(447		)		(212		)	(124		)	(336		)
	Net amount recognized	$	(310	)		$	(134	)		$	(444	)		$	(212	)	$	(124	)	$	(336	)
	Amounts Recorded in Accumulated OCI
	Net actuarial loss	$	(415	)		$	(107	)		$	(522	)		$	(289	)	$	(78	)	$	(367	)
	The following table presents information about the projected benefit obligation, accumulated benefit obligation (“ABO”) and plan assets of the Company’s pension plans (in millions):
		December 31, 2014												December 31, 2013
		U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
	Plans with ABO in excess of fair value
	of plan assets:
	Projected benefit obligation	$	1,193			$	457			$	1,650			$	1,070		$	414		$	1,484
	Accumulated benefit obligation	$	1,193			$	441			$	1,634			$	1,070		$	400		$	1,470
	Fair value of plan assets	$	883			$	321			$	1,204			$	858		$	293		$	1,151
	Plans with fair value of assets in excess of ABO:
	Projected benefit obligation	$	—			$	107			$	107			$	—		$	132		$	132
	Accumulated benefit obligation	$	—			$	99			$	99			$	—		$	121		$	121
	Fair value of plan assets	$	—			$	109			$	109			$	—		$	129		$	129
	Total projected benefit obligation	$	1,193			$	564			$	1,757			$	1,070		$	546		$	1,616
	Total accumulated benefit obligation	$	1,193			$	540			$	1,733			$	1,070		$	521		$	1,591
	Total plan assets	$	883			$	430			$	1,313			$	858		$	422		$	1,280
	Weighted-Average Assumptions Used to Determine Benefit Obligation
	The following table presents weighted average assumptions used to determine benefit obligations at the measurement dates noted:
		December 31,
		2014			2013
	United States Plans
	Discount rate	3.85	%		4.65	%
	Expected return on plan assets	7	%		7	%
	Non-United States Plans
	Discount rate	3.6	%		4.45	%
	Expected return on plan assets	6.27	%		6.38	%
	Rate of compensation increase	4.01	%		3.94	%
	Components of Net Periodic Pension Cost
	The following table presents the components of net periodic pension cost for the periods noted (in millions):
	Twelve Months Ended December 31,
	2014				2013				2012
Service cost	$	13			$	15			$	15
Interest cost	71				65				72
Expected return on plan assets	(84		)		(84		)		(86		)
Amortization of actuarial loss	11				20				29
Net periodic benefit cost	$	11			$	16			$	30
Weighted-Average Assumptions Used to Determine Net Periodic Pension Cost
The following table presents weighted-average assumptions used to determine net periodic pension costs for the periods noted:
	Twelve Months Ended December 31,
	2014					2013					2012
United States Plans
Discount rate	4.65	%				3.8	%				4.6	%
Expected return on plan assets	7	%				7.5	%				7.25	%
Rate of compensation increase	N/A			(a)		N/A			(a)		N/A			(a)
Non-United States Plans
Discount rate	4.45	%				4.1	%				4.65	%
Expected return on plan assets	6.38	%				6.13	%				7.23	%
Rate of compensation increase	3.94	%				3.5	%				3.75	%
(a)	Not applicable due to changes in plan made on August 1, 2009 that were effective beginning January 1, 2010.
The expected return on plan assets assumption is derived by taking into consideration the target plan asset allocation, historical rates of return on those assets, projected future asset class returns and net outperformance of the market by active investment managers. An asset return model is used to develop an expected range of returns on plan investments over a 20 year period, with the expected rate of return selected from a best estimate range within the total range of projected results. The result is then rounded down to the nearest 25 basis points.
Accumulated Other Comprehensive Earnings (Deficit)
For the year ended December 31, 2014, the Company recorded a debit of $94 million, net of tax, to OCI. Of the $(522) million balance in OCI, $19 million is expected to be recognized as net periodic pension cost during 2015. For the year ended December 31, 2013, the Company recorded a charge of $81 million, net of tax, to OCI.
Items Measured at Fair Value
The Company classifies and discloses pension plan assets in one of the following three categories:
Level 1: Quoted market prices in active markets for identical assets.
Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.
Level 3: Unobservable inputs that are not corroborated by market data.
Plan Assets
The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall under United States pension plan assets at December 31, 2014 and 2013 (in millions):
	2014
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	99			$	39			$	—			$	138
Domestic passive index	—				61				—				61
International actively managed	81				34				—				115
International passive index	—				26				—				26
Fixed income and cash equivalents
Cash	2				—				—				2
Short-term debt	—				26				—				26
Corporate bonds	229				55				—				284
Government debt	98				—				—				98
Real estate investment trusts	28				—				—				28
Absolute return strategies	—				55				—				55
Real assets	—				50				—				50
Total United States plan assets	$	537			$	346			$	—			$	883
	2013
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	100			$	38			$	—			$	138
Domestic passive index	—				58				—				58
International actively managed	85				36				—				121
International passive index	—				25				—				25
Fixed income and cash equivalents
Short-term debt	—				27				—				27
Corporate bonds	213				54				—				267
Government debt	91				—				—				91
Real estate investment trusts	26				—				—				26
Absolute return strategies	—				80				—				80
Real assets	—				25				—				25
Total United States plan assets	$	515			$	343			$	—			$	858
The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall under non-United States pension plan assets at December 31, 2014 and 2013 (in millions):
	2014
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	—			$	30			$	—			$	30
Domestic passive index	—				—				—				—
International actively managed	—				51				—				51
International passive index	—				35				—				35
Fixed income and cash equivalents
Cash and cash equivalents	—				28				—				28
Corporate bonds	—				193				—				193
Government Debt	—				—				—				—
Absolute return strategies	—				93				—				93
Total non-United States plan assets	$	—			$	430			$	—			$	430
	2013
Asset Category	Level 1				Level 2				Level 3				Total
Equity
Domestic actively managed	$	—			$	34			$	—			$	34
Domestic passive index	—				4				—				4
International actively managed	—				61				—				61
International passive index	—				28				—				28
Fixed income and cash equivalents
Cash and cash equivalents	3				22				—				25
Corporate bonds	—				162				—				162
Government Debt	—				7				—				7
Absolute return strategies	—				101				—				101
Total non-United States plan assets	$	3			$	419			$	—			$	422
Investment Strategy
The current investment policy for the United States pension plan is to have 38% of assets invested in equities, 3% in real estate, 6% in real assets, and 47% in intermediate and long-term fixed income securities, and 6% in absolute return strategies. Assets are rebalanced quarterly to conform to policy tolerances. The Company actively evaluates the reasonableness of its asset mix given changes in the projected benefit obligation and market dynamics.
Estimated Future Benefit Payments
The following table shows estimated future benefit payments from the Company’s pension plans (in millions):
Year		Estimated
		Benefit
		Payments
2015		$106
2016		$102
2017		$103
2018		$101
2019		$103
2020-2023		$509
Contributions
Owens Corning expects to contribute $48 million in cash to the United States pension plan during 2015 and another $14 million to non-United States plans. Actual contributions to the plans may change as a result of a variety of factors, including changes in laws that impact funding requirements.
Defined Contribution Plans
The Company sponsors two defined contribution plans which are available to substantially all United States employees. The Company matches a percentage of employee contributions up to a maximum level and contributes 2% of an employee’s wages regardless of employee contributions. The Company recognized expense of $34 million, $29 million and $30 million during the years ended December 31, 2014, 2013 and 2012, respectively, related to these plans.
POSTEMPLOYMENT AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS
The Company maintains health care and life insurance benefit plans for certain retired employees and their dependents. The health care plans in the United States are non-funded and pay either (1) stated percentages of covered medically necessary expenses, after subtracting payments by Medicare or other providers and after stated deductibles have been met, or (2) fixed amounts of medical expense reimbursement.
Employees become eligible to participate in the United States health care plans upon retirement if they have accumulated 10 years of service after age 45, 48 or 50, depending on the category of employee. For employees hired after December 31, 2005, the Company does not provide subsidized retiree health care. Some of the plans are contributory, with some retiree contributions adjusted annually. The Company has reserved the right to change or eliminate these benefit plans subject to the terms of collective bargaining agreements.
The Company implemented an Employee Group Waiver Plan (EGWP) effective January 1, 2013 to manage its prescription drug benefits for certain retiree groups. The Company also negotiated with certain unionized employees to increase the eligibility age for retiree medical benefits and to eliminate the post-65 retiree reimbursement account benefit for employees retiring on or after January 1, 2014.
The following table provides a reconciliation of the change in the projected benefit obligation and the net amount recognized in the Consolidated Balance Sheets for the years ended December 31, 2014 and 2013 (in millions):
	December 31, 2014												December 31, 2013
	U.S.				Non-U.S.				Total				U.S.			Non-U.S.			Total
Change in Projected Benefit Obligation
Benefit obligation at beginning of period	$	228			$	16			$	244			$	252		$	21		$	273
Service cost	2				—				2				2			1			3
Interest cost	9				1				10				8			1			9
Actuarial loss (gain)	17				—				17				(18		)	(2		)	(20		)
Currency loss (gain)	—				(1		)		(1		)		—			—			—
Plan amendments	—				—				—				—			—			—
Benefits paid	(18		)		(1		)		(19		)		(18		)	(2		)	(20		)
Other	—				1				1				2			(3		)	(1		)
Benefit obligation at end of period	$	238			$	16			$	254			$	228		$	16		$	244
Funded status	$	(238	)		$	(16	)		$	(254	)		$	(228	)	$	(16	)	$	(244	)
Amounts Recognized in the Consolidated
Balance Sheets
Accrued benefit obligation – current	$	(18	)		$	(1	)		$	(19	)		$	(20	)	$	—		$	(20	)
Accrued benefit obligation – non-current	(220		)		(15		)		(235		)		(208		)	(16		)	(224		)
Net amount recognized	$	(238	)		$	(16	)		$	(254	)		$	(228	)	$	(16	)	$	(244	)
Amounts Recorded in Accumulated OCI
Net actuarial gain	$	(20	)		$	—			$	(20	)		$	21		$	6		$	27
Net prior service credit	(2		)		(5		)		(7		)		24			—			24
Net amount recognized	$	(22	)		$	(5	)		$	(27	)		$	45		$	6		$	51
Weighted-Average Assumptions Used to Determine Benefit Obligations
The following table presents the discount rates used to determine the benefit obligations:
	December 31,
	2014			2013
United States plans	3.7	%		4.35	%
Non-United States plans	3.7	%		4.45	%
Components of Net Periodic Postretirement Benefit Cost
The following table presents the components of net periodic postretirement benefit cost (in millions):
	Twelve Months Ended December 31,
	2014				2013				2012
Service cost	$	2			$	3			$	3
Interest cost	10				9				11
Amortization of prior service cost	(4		)		(4		)		(4		)
Amortization of actuarial gain	(2		)		(1		)		(3		)
Curtailment gain	—				—				(1		)
Net periodic postretirement benefit cost	$	6			$	7			$	6
Weighted-Average Assumptions Used to Determine Net Periodic Postretirement Benefit Cost
The following table presents the discount rates used to determine net periodic postretirement benefit cost:
	Twelve Months Ended December 31,
	2014			2013			2012
United States plans	4.35	%		3.5	%		4.35	%
Non-United States plans	4.45	%		3.8	%		4.1	%
The following table presents health care cost trend rates used to determine net periodic postretirement benefit cost, as well as information regarding the ultimate rate and the year in which their ultimate rate is reached:
	Twelve Months Ended December 31,
	2014			2013			2012
United States plans
Initial rate at end of year	7	%		7	%		7	%
Ultimate rate	5	%		5	%		5	%
Year in which ultimate rate is reached	2024			2023			2022
Non-United States plans
Initial rate at end of year	5.43	%		6.23	%		6.5	%
Ultimate rate	4.7	%		4.79	%		4.8	%
Year in which ultimate rate is reached	2019			2019			2019
The health care cost trend rate assumption can have a significant effect on the amounts reported. To illustrate, a one-percentage point change in the December 31, 2014 assumed health care cost trend rate would have the following effects (in millions):
	1-Percentage Point
	Increase				Decrease
Increase (decrease) in total service cost and interest cost components of net periodic postretirement benefit cost	$	1			$	—
Increase (decrease) of accumulated postretirement benefit obligation	$	10			$	(8	)
Accumulated Other Comprehensive Earnings (Deficit)
For the year ended December 31, 2014, the Company recorded other comprehensive loss of $(13) million, net of tax, to OCI. Approximately $4 million of the $27 million balance in accumulated OCI is expected to be recognized as net periodic postretirement benefit during 2015. For the year ended December 31, 2013, the Company recorded other comprehensive income of $7 million, net of tax, to OCI.
Estimated Future Benefit Payments
The following table shows estimated future benefit payments from the Company’s postretirement benefit plans (in millions):
Year	Estimated
	Benefit
	Payments
2015	$	19
2016	$	20
2017	$	20
2018	$	19
2019	$	19
2020-2024	$	88
Postemployment Benefits
The Company may also provide benefits to former or inactive employees after employment but before retirement under certain conditions. These benefits include continuation of benefits such as health care and life insurance coverage. The accrued postemployment benefits liability at December 31, 2014 and 2013 was $17 million and $18 million, respectively. The net periodic postemployment benefit expense was $1 million for each of the years ended December 31, 2014, 2013 and 2012.

CONTINGENT_LIABILITIES_AND_OTH

CONTINGENT LIABILITIES AND OTHER MATTERS	12 Months Ended
	Dec. 31, 2014
Loss Contingency [Abstract]
CONTINGENT LIABILITIES AND OTHER MATTERS	CONTINGENT LIABILITIES AND OTHER MATTERS
	The Company is involved in various legal proceedings relating to employment, product liability and other matters (collectively, “Proceedings”). The Company regularly reviews the status of such Proceedings along with legal counsel. Liabilities for such Proceedings are recorded when it is probable that the liability has been incurred and when the amount of the liability can be reasonably estimated. Liabilities are adjusted when additional information becomes available. Management believes that the amount of any reasonably possible losses in excess of any amounts accrued, if any, with respect to such Proceedings or any other know claim, including the matters described below under the caption Environmental Matters (the “Environmental Matters”) will not be material to the Company’s financial statements. Management believes that the ultimate disposition of the Proceedings and the Environmental Matters will not have a material adverse effect on the Company’s operations or financial condition taken as a whole.
	Litigation
	The Company is involved in litigation from time to time in the regular course of its business. The Company believes that adequate provisions for resolution of all contingencies, claims and pending litigation have been made for probable losses that are reasonably estimable. The Company does not believe that the ultimate outcome of these actions will have a material adverse effect on its financial condition, results of operations or cash flows.
	Environmental Matters
	The Company has been deemed by the United States Environmental Protection Agency to be a Potentially Responsible Party (“PRP”) with respect to certain sites under the Comprehensive Environmental Response Compensation and Liability Act. The Company has also been deemed a PRP under similar state or local laws and in other instances other PRPs have brought suits against it as a PRP for contribution under such federal, state, or local laws. At December 31, 2014, the Company had environmental remediation liabilities as a PRP at 21 sites where it has a continuing legal obligation to either complete remedial actions or contribute to the completion of remedial actions as part of a group of PRPs. Environmental liability estimates may be affected by changing determinations of what constitutes an environmental exposure or an acceptable level of cleanup. To the extent that the required remediation procedures or timing of those procedures change, additional contamination is identified, or the financial condition of other PRPs is adversely affected, the estimate of our environmental liabilities may change. For these sites the Company estimates a reserve to reflect environmental liabilities that have been asserted or are probable of assertion, in which liabilities are probable and reasonably estimable. At December 31, 2014, our reserve for such liabilities was $3 million. Changes in required remediation procedures or timing of those procedures at existing legacy sites, or discovery of contamination at additional sites, could result in increases to our environmental obligations.
	Kearny, New Jersey Manufacturing Facility
	In the third quarter of 2012, the Company's Roofing segment experienced a flood at its Kearny, New Jersey manufacturing facility as a result of Hurricane Sandy. The facility is insured for property damage and business interruption losses related to such events, subject to deductibles and policy limits. The facility returned to full operating capacity in the third quarter of 2013. In the fourth quarter of 2013, the Company settled its insurance claims for a net $78 million. The proceeds received on settlement substantially cover all costs/losses incurred.
	For the year ended December 31, 2014, the Company incurred losses related to clean up and repair costs in the amount of $1 million reported in Cost of Sales and $5 million reported in Other expense (income), net, on the Consolidated Statements of Earnings (Loss). For the year ended December 31, 2013, the Company incurred losses related to clean up activities and business interruption in the amount of $27 million reported in Costs of Sales, and $16 million reported in Other expenses (income), net, on the Consolidated Statements of Earnings (Loss). These expenses were more than offset by the $58 million of insurance proceeds recorded in Other expenses (income), net on the Consolidated Statements of Earnings (Loss). For the year ended December 31, 2012, the Company incurred losses related to clean up activities and business interruption in the amount of $6 million reported in Costs of Sales, and $23 million reported in Other expenses (income), net, on the Consolidated Statements of Earnings (Loss), partially offset by $20 million of insurance proceeds recorded in Other expenses (income), net on the Consolidated Statements of Earnings (Loss).

STOCK_COMPENSATION

STOCK COMPENSATION	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK COMPENSATION	STOCK COMPENSATION
	2013 Stock Plan
	On April 18, 2013, the Company’s stockholders approved the Owens Corning 2013 Stock Plan (the “2013 Stock Plan”) which replaced the 2010 Stock Plan. The 2013 Stock Plan authorizes grants of stock options, stock appreciation rights, restricted stock awards, restricted stock units, bonus stock awards and performance stock awards. Under the 2013 Stock Plan, 1.5 million shares of common stock may be granted in addition to the shares of Company common stock that rolled over from the 2010 Stock Plan as of April 18, 2013. Such shares of common stock include shares that were available but not granted, or which were granted but were not issued or delivered due to expiration, termination, cancellation or forfeiture of such awards. There will be no future grants made under the 2010 Stock Plan. At December 31, 2014 the number of shares remaining available under the 2013 Stock Plan for all stock awards was 2.4 million.
	Stock Options
	The Company has granted stock options under its stockholder approved stock plans. The Company calculates a weighted-average grant-date fair value using a Black-Scholes valuation model for options granted. Compensation expense for options is measured based on the fair market value of the option on the date of grant, and is recognized on a straight-line basis over a four year vesting period. In general, the exercise price of each option awarded was equal to the market price of the Company’s common stock on the date of grant and an option’s maximum term is 10 years. The volatility assumption was based on a benchmark study of our peers prior to 2014 . Starting with the options granted in 2014 the volatility was based on the company’s historic volatility.
	During 2014, 374,500 stock options were granted with a weighted-average grant date fair value of $19.05. Assumptions used in the Company’s Black-Scholes valuation model to estimate the grant date fair value were expected volatility of 50.9%, expected dividends of 0%, expected term of 6.25 years and a risk-free interest rate of 1.9%.
	During 2013, 329,800 stock options were granted with a weighted-average grant date fair value of $18.94. Assumptions used in the Company’s Black-Scholes valuation model to estimate the grant date fair value were expected volatility of 45.3%, expected dividends of 0%, expected term of 6.26 years and a risk-free interest rate of 1.1%.
	During 2012, 409,700 stock options were granted with a weighted-average grant date fair value of $15.85. Assumptions used in the Company’s Black-Scholes valuation model to estimate the grant date fair value were expected volatility of 45.8%, expected dividends of 0%, expected term of 6.26 years and a risk-free interest rate of 1.1%.
	During the years ended December 31, 2014, 2013 and 2012, the Company recognized expense of $6 million, $5 million and $5 million respectively, related to the Company’s stock options. As of December 31, 2014 there was $9 million of total unrecognized compensation cost related to stock options. That cost is expected to be recognized over a weighted-average period of 2.55 years. The total aggregate intrinsic value of options outstanding as of December 31, 2014, 2013, and 2012 was $16 million, $31 million and $28 million, respectively. The total aggregate intrinsic value of options exercisable as of December 31, 2014, 2013, and 2012 was $15 million, $27 million and $28 million, respectively. Cash received from option exercises was $8 million, $15 million and $12 million for the years ended December 31, 2014, 2013 and 2012, respectively. Tax benefits realized from tax deductions associated with option exercises totaled $2 million, $3 million and $2 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	The following table summarizes the Company’s stock option activity:
		Twelve Months Ended December 31, 2014					Twelve Months Ended December 31, 2013					Twelve Months Ended December 31, 2012
		Number of		Weighted-			Number of		Weighted-			Number of			Weighted-
		Options		Average			Options		Average			Options			Average
				Exercise Price					Exercise Price						Exercise Price
	Beginning Balance	2,748,720		$	29.55		3,025,220		$	27.78		3,293,545			$	26.26
	Granted	374,500		37.65			329,800		42.16			409,700			33.73
	Exercised	(328,875	)	25.23			(549,800	)	26.88			(520,120	)		22.65
	Forfeited	(35,400	)	38.09			(56,500	)	34.58			(157,905	)		28.48
	Expired	(4,050	)	34.5			—		—			—			—
	Ending Balance	2,754,895		$	31.04		2,748,720		$	29.55		3,025,220			$	27.78
	The following table summarizes information about the Company’s options outstanding and exercisable:
	Options Outstanding								Options Exercisable
					Weighted-Average				Number		Weighted-Average
									Exercisable at
	Range of		Options		Remaining	Exercise Price			Dec. 31, 2014		Remaining		Exercise Price
	Exercise		Outstanding		Contractual						Contractual
	Prices				Life						Life
	$13.89 - $42.16		2,754,895		4.99	$	31.04		1,934,695		3.72		$	28.18
	Restricted Stock Awards and Restricted Stock Units
	The Company has granted restricted stock awards and restricted stock units (collectively referred to as “restricted stock”) under its stockholder approved stock plans. Compensation expense for restricted stock is measured based on the market price of the stock at date of grant and is recognized on a straight-line basis over the four year vesting period. Stock restrictions are subject to alternate vesting plans for death, disability, approved early retirement and involuntary termination, over various periods ending in 2015.
	During the years ended December 31, 2014, 2013 and 2012, the Company recognized expense of $17 million, $16 million and $15 million respectively, related to the Company’s restricted stock. As of December 31, 2014, there was $24 million of total unrecognized compensation cost related to restricted stock. That cost is expected to be recognized over a weighted-average period of 2.53 years. The total grant date fair value of shares vested during the years ended December 31, 2014, 2013 and 2012, was $15 million, $16 million and $12 million, respectively.
	A summary of the status of the Company’s plans that had restricted stock issued as of December 31, 2014, 2013 and 2012 and changes during the twelve months ended December 31, 2014, 2013 and 2012 are presented below:
		Twelve Months Ended December 31, 2014					Twelve Months Ended December 31, 2013					Twelve Months Ended December 31, 2012
		Number of		Weighted-			Number of		Weighted-			Number of			Weighted-
		Shares		Average			Shares		Average			Shares			Average
				Grant Date					Grant Date						Grant Date
				Fair Value					Fair Value						Fair Value
	Beginning Balance	1,735,824		$	32.49		1,875,065		$	27.14		1,941,742			$	23.83
	Granted	522,994		36.72			512,398		41.01			638,618			33.43
	Vested	(459,359	)	32.49			(573,920	)	26			(544,528	)		22.38
	Forfeited	(71,718	)	37.17			(77,719	)	34.62			(160,767	)		28.36
	Ending Balance	1,727,741		$	33.58		1,735,824		$	32.49		1,875,065			$	27.14
	Performance Stock Awards and Performance Stock Units
	The Company has granted performance stock awards and performance stock units (collectively referred to as “PSUs”) as a part of its long-term incentive plan. Outstanding grants issued from 2013 forward will be fully settled in stock and outstanding grants issued in 2012 will be settled 50% in stock and 50% in cash. The amount of the stock and/or cash ultimately distributed is contingent on meeting various company or stockholder return goals.
	Compensation expense for PSUs settled in stock is measured based on the grant date fair value and is recognized on a straight-line basis over the vesting period. Compensation expense for PSUs settled in cash is measured based on the fair value at the end of each quarter and is recognized on a straight-line basis over the vesting period. Vesting will be accelerated in the case of death or disability and awards earned will be paid at the end of the three-year period.
	The Company granted PSUs in 2014, 2013 and 2012. The 2014, 2013, and 2012 grants vest after a three-year period based on the Company’s total stockholder return relative to the performance of the components of the S&P 500 Index for the respective three-year period. The amount of PSUs earned will vary from 0% to 200% of PSUs awarded depending on the relative stockholder return performance.
	For all PSUs, respectively, during the period ended December 31, 2014, 2013 and 2012, the Company recognized expense of $6 million, $7 million and $13 million. As of December 31, 2014, there was $10 million of total unrecognized compensation cost related to PSUs. That cost is expected to be recognized over a weighted-average period of 1.7 years. The total grant date fair value of shares vested during the years ended December 31, 2014, 2013 and 2012, was $1 million, $9 million and $11 million, respectively.
	2014 Grant
	For the 2014 grant, the fair value of PSUs was estimated at the grant date using a Monte Carlo simulation that used various assumptions that include expected volatility of 36.00%, a risk free interest rate of 0.68% and an expected term of 2.9 years. Expected volatility was based on a benchmark study of our peers. The risk-free interest rate was based on zero coupon United States Treasury bills at the grant date. The expected term represents the period from the grant date to the end of the three-year performance period.
	2013 Grant
	For the 2013 grant, the fair value of the PSUs was estimated at the grant date using a Monte Carlo simulation that used various assumptions that include expected volatility of 36.7%, a risk free interest rate of 0.4% and an expected term of 2.9 years. Expected volatility was based on a benchmark study of our peers. The risk-free interest rate was based on zero coupon United States Treasury bills at the grant date. The expected term represents the period from the grant date to the end of the three-year performance period.
	2012 Grant
	For the 2012 grant, the portion of the PSUs settled in cash will be revalued every reporting period until the award is fully vested. As a result, compensation expense recognized will be adjusted and previous surplus compensation expense recognized will be reversed or additional expense will be recognized. For the period ended December 31, 2014, the Company estimated the fair value of the award based on the Company’s total stockholder return relative to the performance of the components of the S&P 500 Index for the respective three-year period.
	For the 2012 grant, the fair value of the portion of PSUs settled in stock was estimated at the grant date using a Monte Carlo simulation that used various assumptions that include expected volatility of 48.2%, a risk free interest rate of 0.3% and an expected term of 2.91 years. Expected volatility was based on a benchmark study of our peers. The risk-free interest rate was based on zero coupon United States Treasury bills at the grant date. The expected term represents the period from the grant date to the end of the three-year performance period.
		Twelve Months Ended December 31, 2014					Twelve Months Ended December 31, 2013					Twelve Months Ended December 31, 2012
		Number of		Weighted-			Number of		Weighted-			Number of			Weighted-
		PSUs		Average			PSUs		Average			PSUs			Average
				Grant Date					Grant  Date						Grant  Date
				Fair Value					Fair Value						Fair Value
	Beginning Balance	410,500		$	53.04		412,910		$	49.14		508,616			$	42.24
	Granted	248,950		44.43			207,050		56.71			256,400			47.97
	Vested	(199,450	)	52.11			(167,610	)	48.61			(260,580	)		36.52
	Forfeited/canceled	(43,750	)	41.71			(41,850	)	50.39			(91,526	)		43.45
	Ending Balance	416,250		$	49.53		410,500		$	53.04		412,910			$	49.14
2013 Employee Stock Purchase Plan
On April 18, 2013, the Company’s stockholders approved the Owens Corning Employee Stock Purchase Plan (“ESPP”). The ESPP is a tax qualified plan under Section 423 of the Internal Revenue Code. The purchase price of shares purchased under the ESPP is equal to 85% of the lower of the fair market value of shares of Owens Corning common stock at the beginning or ending of the offering period, which is a six month period ending on May 31 and November 30 of each year. There were 2 million shares available for purchase under the ESPP as of its approval date. The Company recognized expense related to the ESPP of $2 million and $1 million for the years ended December 31, 2014 and 2013, respectively. As of December 31, 2014, the Company had $1 million of total unrecognized compensation costs related to the ESPP. For the years ended December 31, 2014 and 2013, our employees purchased 0.2 million shares at an average price of $34.10 and 0.1 million shares at an average price of $33.29, respectively. Under the outstanding ESPP as of February 9, 2015, employees have contributed $1 million to purchase shares for the current purchase period ending May 31, 2015.

ACCUMULATED_OTHER_COMPREHENSIV

ACCUMULATED OTHER COMPREHENSIVE INCOME	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME	ACCUMULATED OTHER COMPREHENSIVE INCOME
	A summary of the balances within each classification of accumulated OCI (deficit) as of December 31, 2014 and 2013 (in millions):
		Cash Flow				Defined				OCI			Foreign			Total
		Hedge				Benefit				Valuation			Currency
		Activity				Pension				Allowance			Translation
						Plan				activity			Adjustment
						Activity
	Balance as of December 31, 2012, net of tax	$	(1	)		$	(279	)		$	(114	)	$	30		$	(364	)
	Amounts classified into AOCI, net of tax	$	1			$	15			$	(1	)	$	(28	)	$	(13	)
	Amounts reclassified from AOCI, net of tax					80				—			—			80
	Change in AOCI, net of tax	1				95				(1		)	(28		)	67
	Balance as of December 31, 2013, net of tax	$	—			$	(184	)		$	(115	)	$	2		$	(297	)
	Amounts classified into AOCI, net of tax	$	(5	)		$	(111	)		$	(7	)	$	(136	)	(259		)
	Amounts reclassified from AOCI, net of tax	—				5				—			1			6
	Change in AOCI, net of tax	(5		)		(106		)		(7		)	(135		)	(253		)
	Balance as of December 31, 2014, net of tax	$	(5	)		$	(290	)		$	(122	)	$	(133	)	$	(550	)
	The following table presents the impact and respective location of AOCI reclassifications on the Consolidated Statements of Earnings (Loss), net of tax (in millions):
				Twelve Months Ended December 31,
		Location		2014				2013
	Foreign Currency Translation Adjustment	Other (income) expenses, net		$	1			$	—
	Defined benefit pension plan activity	Cost of sales		4				61
	Defined benefit pension plan activity	Marketing and administrative		1				19
		expenses
	Total reclassifications from AOCI			$	6			$	80

WARRANTS

WARRANTS	12 Months Ended
	Dec. 31, 2014
Warrants and Rights Note Disclosure [Abstract]
WARRANTS	WARRANTS
	The Company issued 17.5 million Series A warrants (representing the right to purchase one share of the Company’s common stock for $43.00) and 7.8 million Series B warrants (representing the right to purchase one share of the Company’s common stock for $45.25) on October 31, 2006, all of which expired on October 31, 2013 and were no longer outstanding as of December 31, 2013.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE
	The following table summarizes the number of shares outstanding as well as our basic and diluted earnings per share for the years ended December 31, 2014, 2013 and 2012 (in millions, except per share amounts):
		Twelve Months Ended December 31,
		2014		2013		2012
	Net earnings (loss) attributable to Owens Corning	$	226	$	204	$	(19	)
	Weighted-average number of shares outstanding used for basic earnings per share	117.5		118.2		119.4
	Non-vested restricted and performance shares	0.4		0.4		—
	Options to purchase common stock	0.4		0.5		—
	Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share	118.3		119.1		119.4
	Earnings (loss) per common share attributable to Owens Corning common stockholders:
	Basic	$	1.92	$	1.73	$	(0.16	)
	Diluted	$	1.91	$	1.71	$	(0.16	)
	Basic earnings (loss) per share is calculated by dividing earnings (loss) attributable to Owens Corning by the weighted-average number of shares of the Company’s common stock outstanding during the period. Outstanding shares consist of issued shares less treasury stock.
	On April 19, 2012, the Company approved a new share buy-back program under which the Company is authorized to repurchase up to 10 million shares of the Company’s outstanding common stock (the “2012 Repurchase Program”). The Repurchase Program authorizes the Company to repurchase shares through the open market, privately negotiated, or other transactions. The actual number of shares repurchased will depend on timing, market conditions and other factors and will be at the Company’s discretion. During the year ended December 31, 2014, 0.9 million shares were repurchased under the Repurchase Program. As of December 31, 2014, 7.7 million shares remain available for repurchase under the Repurchase Program.
	For the year ended December 31, 2014, the number of shares used in the calculation of diluted earnings (loss) per share did not include 1.0 million options to purchase common stock, due to their anti-dilutive effect.
	For the year ended December 31, 2013, the number of shares used in the calculation of diluted earnings (loss) per share did not include 0.6 million options to purchase common stock, due to their anti-dilutive effect.
	For the year ended December 31, 2012, the number of shares used in the calculation of diluted earnings (loss) per share did not include 0.2 million performance shares, 0.5 million non-vested restricted shares, 0.6 million options to purchase common stock, 17.5 million common equivalent shares from Series A Warrants or 7.8 million common equivalent shares from Series B Warrants due to their anti-dilutive effect.

FAIR_VALUE_MEASUREMENT

FAIR VALUE MEASUREMENT	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENT	FAIR VALUE MEASUREMENT
	Items Measured at Fair Value
	The Company classifies and discloses assets and liabilities carried at fair value in one of the following three categories:
	Level 1: Quoted market prices in active markets for identical assets or liabilities.
	Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.
	Level 3: Unobservable inputs that are not corroborated by market data.
	The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall, for assets and liabilities measured on a recurring basis as of December 31, 2014 (in millions):
		Total		Quoted Prices		Significant		Significant
		Measured		in Active		Other		Unobservable
		at Fair		Markets for		Observable		Inputs
		Value		Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets:
	Cash equivalents	$	10	$	10	$	—	$	—
	Term deposits	2		2		—		—
	Derivative assets	1		—		1		—
	Total assets	$	13	$	12	$	1	$	—
	Liabilities:
	Derivative liabilities	$	8	$	—	$	8	$	—
	Total liabilities	$	8	$	—	$	8	$	—
	The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall, for assets and liabilities measured on a recurring basis as of December 31, 2013 (in millions):
		Total		Quoted Prices		Significant		Significant
		Measured		in Active		Other		Unobservable
		at Fair		Markets for		Observable		Inputs
		Value		Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets:
	Cash equivalents	$	20	$	20	$	—	$	—
	Term deposits	2		2
	Derivative assets	1		—		1		—
	Total assets	$	23	$	22	$	1	$	—
	Liabilities:
	Derivative liabilities	$	4	$	—	$	4	$	—
	Total liabilities	$	4	$	—	$	4	$	—
	Cash equivalents, by their nature, utilize Level 1 inputs in determining fair value. The Company measures the value of its natural gas hedge contracts. foreign currency forward contracts, and interest rate swap contracts using Level 2 inputs. The fair value of the Company’s natural gas hedges is determined by a mark to market valuation based on forward curves using observable market prices and the fair value of its foreign currency forward contracts is determined using observable market transactions in over-the-counter markets. Also the fair value of the Company’s interest rate swap hedges is determined by a mark to market valuation based on forward interest rate curves using published rates.
	Items Disclosed at Fair Value
	Contingent consideration
	In connection with our third quarter 2014 acquisition discussed in Note 9, the Company recorded contingent consideration pertaining to amounts payable to the former owners related to a put/call option that is to be determined based on a multiple of 2016 EBITDA that contains a cap of $7 million and a floor of $4 million. The fair value of the put/call option was estimated to be $5 million and has been recorded in other liabilities on the Consolidated Balance Sheets. The valuation of contingent consideration uses assumptions the Company believes would be made by a market participant and has been based on significant inputs not observable in the market. The significant unobservable input used in the fair value measurement of our contingent consideration includes our internal forecast of business performance, which is a Level 3 input.
	Assets held for sale
	At December 31, 2014 the Company had nonfinancial assets, principally property, plant and equipment, with a net book value of $11 million which were accounted for at fair value on a nonrecurring basis. These assets were tested for impairment and the Company recognized losses of $3 million in the year ended December 31, 2014, primarily in connection with the final closing of our Alcala, Spain facility as announced in our 2012 Composites cost reduction actions. The Company has determined that the fair value measurements of these nonfinancial assets are level 3 in the fair value hierarchy. The valuation of property, plant and equipment uses assumptions the Company believes would be made by a market participant and has been based on significant inputs not observable in the market. The significant unobservable input used in the fair value measurement of property, plant and equipment includes recent market transactions for similar assets.
	Long-term debt
	The fair value of the Company’s long-term debt has been calculated based on quoted market prices for the same or similar issues, or on the current rates offered to the Company for debt of the same remaining maturities.
	As of December 31, 2014, the Company’s 6.50% senior notes due 2016 were trading at approximately 109% of par value, the 7.00% senior notes due 2036 were trading at approximately 124% of par value, the 9.00% senior notes due 2019 were trading at approximately 119% of par value , the 4.20% senior notes due 2022 were trading at approximately 101% of par value, and the 4.20% senior notes due 2024 were trading at approximately 99% of par value. The Company determined that the book value of the remaining long-term debt instruments approximates market value. This approach, using level 1 inputs and utilizing indicative market rates for a new debt issuance, approximated the fair value of the remaining long-term debt at $153 million.
	As of December 31, 2013, the Company’s 6.50% senior notes due 2016 were trading at approximately 112% of par value, the 7.00% senior notes due 2036 were trading at approximately 109% of par value, the 9.00% senior notes due 2019 were trading at approximately 127% of par value and the 4.20% senior notes due 2022 were trading at approximately 102% of par value. Using level 1 inputs and utilizing indicative market rates for a new debt issuance, approximated the fair value of the remaining long-term debt at $268 million.

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES
		Twelve Months Ended December 31,
		2014				2013				2012
	Earnings before taxes:
	United States	$	106			$	196			$	31
	Foreign	126				77				(71		)
	Total	$	232			$	273			$	(40	)
	Income tax expense (benefit):
	Current
	United States	$	(2	)		$	(2	)		$	1
	State and local	—				(2		)		(2		)
	Foreign	22				30				20
	Total current	20				26				19
	Deferred
	United States	(6		)		56				(22		)
	State and local	8				2				2
	Foreign	(17		)		(16		)		(27		)
	Total deferred	(15		)		42				(47		)
	Total income tax expense (benefit)	$	5			$	68			$	(28	)
	The reconciliation between the United States federal statutory rate and the Company’s effective income tax rate from continuing operations is:
		Twelve Months Ended December 31,
		2014			2013			2012
	United States federal statutory rate	35	%		35	%		(35	)%
	State and local income taxes, net of federal tax benefit	1			2			(5	)
	Foreign tax rate differential	(15	)		(11	)		(60	)
	US tax expense/benefit on foreign earnings/loss	(5	)		(2	)		(62	)
	Valuation allowance	(1	)		17			127
	Loss on liquidation	—			(10	)		—
	Uncertain tax positions and settlements	(18	)		(1	)		(2	)
	Other, net	5			(5	)		(33	)
	Effective tax rate	2	%		25	%		(70	)%
	As of December 31, 2014, the Company has not recorded a deferred tax liability of approximately $511 million for foreign withholding and United States federal income taxes on approximately $1.4 billion of accumulated undistributed earnings of its foreign subsidiaries and affiliates as they are considered by management to be permanently reinvested.
	The cumulative temporary differences giving rise to the deferred tax assets and liabilities at December 31, 2014 and 2013 are as follows (in millions):
		2014								2013
		Deferred				Deferred				Deferred			Deferred
		Tax				Tax				Tax			Tax
		Assets				Liabilities				Assets			Liabilities
	Other employee benefits	$	155			$	—			$	153		$	—
	Pension plans	159				—				115			—
	Operating loss carryforwards	1,046				—				1,117			—
	Depreciation	—				327				—			338
	Amortization	—				366				—			370
	State and local taxes	4				—				6			—
	Other	113				—				135			—
	Subtotal	1,477				693				1,526			708
	Valuation allowances	(227		)		—				(270		)	—
	Total deferred taxes	$	1,250			$	693			$	1,256		$	708
	The Company had current deferred tax assets of $135 million and $138 million which are included in other current assets in the Consolidated Balance Sheets as of December 31, 2014 and 2013, respectively.
	The following table summarizes the amount and expiration dates of our deferred tax assets related to operating loss and credit carryforwards at December 31, 2014 (in millions):
		Expiration		Amounts
		Dates
	US federal loss carryforwards	2026 – 2032		$	692
	US state loss carryforwards (a)	2014 – 2032		82
	Foreign loss and tax credit carryforwards	Indefinite		104
	Foreign loss and tax credit carryforwards (a)	2014 – 2033		129
	US alternative minimum tax credit	Indefinite		25
	Other US federal and state tax credits	2028 – 2033		14
	Total operating loss and tax credit carryforwards			$	1,046
	(a)	As of December 31, 2014, $14 million US state and $11 million foreign deferred tax assets related to loss carryforwards are set to expire over the next three years.
	At December 31, 2014, the Company had federal, state and foreign net operating loss carryforwards of $2.2 billion, $2.4 billion and $0.9 billion, respectively. In order to fully utilize our operating loss and tax credit carryforwards, the Company will need to generate federal, state, and foreign earnings before taxes of approximately $2.4 billion, $2.6 billion, and $900 million, respectively. Certain of these loss carryforwards are subject to limitation as a result of the changes of control that resulted from the Company’s emergence from bankruptcy in 2006 and the acquisition of certain foreign entities in 2007. However, the Company believes that these limitations on its loss carryforwards will not result in a forfeiture of any of the carryforwards.
	Deferred income taxes are provided for temporary differences between amounts of assets and liabilities for financial reporting purposes and the basis of such assets and liabilities as measured under enacted tax laws and regulations, as well as NOLs, tax credit and other carryforwards. A valuation allowance will be recorded to reduce deferred tax assets if, based on all available evidence, it is considered more likely than not that some portion or all of the recorded deferred tax assets will not be realized in future periods. To the extent the reversal of deferred tax liabilities is relied upon in our assessment of the realizability of deferred tax assets, they will reverse in the same period and jurisdiction as the temporary differences giving rise to the deferred tax assets. As of December 31, 2014, the Company had federal, state, and foreign net deferred tax assets before valuation allowances of $481 million, $61 million, and $242 million, respectively.
	The valuation allowance of $227 million as of December 31, 2014 is related to tax assets of $13 million and $214 million for certain state and foreign jurisdictions, respectively. Realization of deferred tax assets depends on achieving a certain minimum level of future taxable income. Management currently believes that it is at least reasonably possible that the minimum level of taxable income will be met within the next 12 months to reduce the valuation allowance of certain foreign jurisdictions by a range of zero to $14 million. The valuation allowance of $270 million as of December 31, 2013 related to tax assets of $12 million and $258 million for certain state and foreign jurisdictions, respectively.
	The Company, or one of its subsidiaries, files income tax returns in the United States and other foreign jurisdictions. The Company is no longer subject to U.S. federal tax examinations for years before 2011 or state and foreign examinations for years before 2008. Due to the potential for resolution of federal, state and foreign examinations, and the expiration of various statutes of limitation, it is reasonably possible that the gross unrecognized tax benefits balance may change within the next 12 months by a range of zero to $6 million.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
	Twelve Months Ended December 31,
	2014				2013				2012
Balance at beginning of period	$	155			$	161			$	170
Tax positions related to the current year
Gross additions	2				2				12
Tax positions related to prior years
Gross additions	10				4				7
Gross reductions	(57		)		(1		)		(14		)
Settlements	(1		)		(3		)		(13		)
Lapses on statutes of limitations	(3		)		(8		)		(1		)
Balance at end of period	$	106			$	155			$	161
The Company classifies all interest and penalties as income tax expense. As of December 31, 2014, 2013 and 2012, the Company recognized $8 million, $6 million and $10 million respectively, in liabilities for tax related interest and penalties on its Consolidated Balance Sheets and $2 million, $(3) million and $(3) million, respectively, of interest and penalty expense on its Consolidated Statements of Earnings (Loss). If these unrecognized tax benefits were to be recognized as of December 31, 2014, the Company’s income tax expense would decrease by about $78 million.

QUARTERLY_FINANCIAL_INFORMATIO

QUARTERLY FINANCIAL INFORMATION (unaudited)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
QUARTERLY FINANCIAL INFORMATION (unaudited)	QUARTERLY FINANCIAL INFORMATION (unaudited)
	Select quarterly financial information is presented in the tables below for the quarterly periods of 2014 and 2013, respectively (in millions, except per share amounts):
		Quarter
		First			Second		Third		Fourth
	2014
	Net sales	$	1,278		$	1,355	$	1,382	$	1,261
	Cost of sales	1,044			1,107		1,131		1,018
	Gross margin	234			248		251		243
	Earnings before interest and taxes	108			73		107		104
	Interest expense, net	27			31		28		28
	Loss on extinguishment of debt	—			—		—		46
	Income tax expense (benefit)	(39		)	21		27		(4		)
	Net earnings attributable to Owens Corning	$	120		$	21	$	52	$	33
	BASIC EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING COMMON STOCKHOLDERS	$	1.02		$	0.18	$	0.44	$	0.28
	DILUTED EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING STOCKHOLDERS	$	1.01		$	0.18	$	0.44	$	0.28
	DIVIDEND PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING STOCKHOLDERS	$	0.16		$	0.16	$	0.16	$	0.16
		Quarter
		First			Second		Third		Fourth
	2013
	Net sales	$	1,350		$	1,347	$	1,320	$	1,278
	Cost of sales	1,137			1,080		1,067		1,045
	Gross margin	213			267		253		233
	Earnings before interest and taxes	57			118		106		104
	Interest expense, net	29			29		29		25
	Income tax expense (benefit)	6			39		26		(3		)
	Net earnings attributable to Owens Corning	$	22		$	49	$	51	$	82
	BASIC EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING COMMON STOCKHOLDERS	$	0.19		$	0.41	$	0.43	$	0.7
	DILUTED EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING STOCKHOLDERS	$	0.18		$	0.41	$	0.43	$	0.69

CONDENSED_CONSOLIDATING_FINANC

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
CONDENSED CONSOLIDATING FINANCIAL STATEMENTS	CONDENSED CONSOLIDATING FINANCIAL STATEMENTS
	The following Condensed Consolidating Financial Statements present the financial information required with respect to those entities which guarantee certain of the Company’s debt. The Condensed Consolidating Financial Statements are presented on the equity method. Under this method, the investments in subsidiaries are recorded at cost and adjusted for the Company’s share of the subsidiaries’ cumulative results of operations, capital contributions, distributions and other equity changes. The principal elimination entries eliminate investment in subsidiaries and intercompany balances and transactions.
	The Company discovered that interest payments on Parent loans were inappropriately classified as cash inflows rather than cash outflows in the Parent’s 2013 Condensed Consolidating Statement of Cash Flows. The misclassification impacted previously reported Parent and Guarantor Subsidiaries’ net cash flow from operations and net cash flow from financing activities by $242 million. The effect of correcting these classification errors was not material to the 2013 consolidating financial information, and the related amounts presented for 2013 have been revised.
	Guarantor and Nonguarantor Financial Statements
	The Senior Notes and the Senior Revolving Credit Facility are guaranteed, fully, unconditionally and jointly and severally, by each of Owens Corning’s current and future 100% owned material domestic subsidiaries that is a borrower or a guarantor under Owens Corning’s Credit Agreement, which permits changes to the named guarantors in certain situations (collectively, the “Guarantor Subsidiaries”). The remaining subsidiaries have not guaranteed the Senior Notes and the Senior Revolving Credit Facility (collectively, the “Nonguarantor Subsidiaries”).
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENT OF EARNINGS (LOSS)
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2014
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET SALES	$	—		$	3,646		$	2,005		$	(375	)	$	5,276
	COST OF SALES	(12		)	3,022			1,665			(375		)	4,300
	Gross margin	12			624			340			—			976
	OPERATING EXPENSES
	Marketing and administrative expenses	112			247			128			—			487
	Science and technology expenses	—			58			18			—			76
	Charges related to cost reduction actions	1			5			31			—			37
	Other expenses (income), net	(38		)	17			5			—			(16		)
	Total operating expenses	75			327			182			—			584
	EARNINGS BEFORE INTEREST AND TAXES	(63		)	297			158			—			392
	Interest expense, net	106			3			5			—			114
	Loss on extinguishment of debt	46			—			—			—			46
	EARNINGS (LOSS) BEFORE TAXES	(215		)	294			153			—			232
	Less: Income tax expense (benefit)	(81		)	85			1			—			5
	EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES AND AFFILIATES	(134		)	209			152			—			227
	Equity in net earnings of subsidiaries	360			151			—			(511		)	—
	Equity in net earnings of affiliates	—			—			1			—			1
	NET EARNINGS (LOSS)	226			360			153			(511		)	228
	Less: Net earnings attributable to noncontrolling interests	—			—			2			—			2
	NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	226		$	360		$	151		$	(511	)	$	226
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENT OF EARNINGS (LOSS)
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2013
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET SALES	$	—		$	3,730		$	1,988		$	(423	)	$	5,295
	COST OF SALES	(10		)	3,085			1,677			(423		)	4,329
	Gross margin	10			645			311			—			966
	OPERATING EXPENSES
	Marketing and administrative expenses	123			267			140			—			530
	Science and technology expenses	—			58			19			—			77
	Charges related to cost reduction actions	—			—			8			—			8
	Other expenses (income), net	(27		)	(39		)	32			—			(34		)
	Total operating expenses	96			286			199			—			581
	EARNINGS BEFORE INTEREST AND TAXES	(86		)	359			112			—			385
	Interest expense, net	104			2			6			—			112
	EARNINGS (LOSS) BEFORE TAXES	(190		)	357			106			—			273
	Less: Income tax expense (benefit)	(72		)	121			19			—			68
	EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES AND AFFILIATES	(118		)	236			87			—			205
	Equity in net earnings of subsidiaries	322			86			—			(408		)	—
	Equity in net earnings of affiliates	—			—			—			—			—
	NET EARNINGS (LOSS)	204			322			87			(408		)	205
	Less: Net earnings attributable to noncontrolling interests	—			—			1			—			1
	NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	204		$	322		$	86		$	(408	)	$	204
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2012
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET SALES	$	—		$	3,616		$	1,932		$	(376	)	$	5,172
	COST OF SALES	(9		)	3,015			1,745			(376		)	4,375
Gross margin	9			601			187			—			797
OPERATING EXPENSES
Marketing and administrative expenses	112			259			138			—			509
Science and technology expenses	—			61			18			—			79
Charges related to cost reduction actions	—			—			51			—			51
Other expenses (income)	(37		)	24			23			—			10
Total operating expenses	75			344			230			—			649
EARNINGS BEFORE INTEREST AND TAXES	(66		)	257			(43		)	—			148
Interest expense, net	102			2			10			—			114
Loss on extinguishment of debt	74			—			—			—			74
EARNINGS (LOSS) BEFORE TAXES	(242		)	255			(53		)	—			(40		)
Less: Income tax expense (benefit)	(92		)	64			—			—			(28		)
EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES AND AFFILIATES	(150		)	191			(53		)	—			(12		)
Equity in net earnings of subsidiaries	131			(55		)	—			(76		)	—
Equity in net earnings (loss) of affiliates	—			(5		)	1			—			(4		)
NET EARNINGS (LOSS)	(19		)	131			(52		)	(76		)	(16		)
Less: Net earnings attributable to noncontrolling interests	—			—			3			—			3
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	(19	)	$	131		$	(55	)	$	(76	)	$	(19	)
OWENS CORNING AND SUBSIDIARIES
CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS (LOSS)
FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2014
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
NET EARNINGS (LOSS)	$	226		$	360		$	153		$	(511	)	$	228
Currency translation adjustment	(134		)	—			—			—			(134		)
Pension and other postretirement adjustment (net of tax)	(113		)	—			—			—			(113		)
Deferred income (loss) on hedging (net of tax)	(6		)	—			—			—			(6		)
COMPREHENSIVE EARNINGS (LOSS)	(27		)	360			153			(511		)	(25		)
Less: Comprehensive earnings attributable to noncontrolling interests	—			—			2			—			2
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	(27	)	$	360		$	151		$	(511	)	$	(27	)
OWENS CORNING AND SUBSIDIARIES
CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS (LOSS)
FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2013
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
NET EARNINGS (LOSS)	$	204		$	322		$	87		$	(408	)	$	205
Currency translation adjustment	(28		)	—			—			—			(28		)
Pension and other postretirement adjustment (net of tax)	94			—			—			—			94
Deferred income (loss) on hedging (net of tax)	1			—			—			—			1
COMPREHENSIVE EARNINGS (LOSS)	271			322			87			(408		)	272
Less: Comprehensive earnings attributable to noncontrolling interests	—			—			1			—			1
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	271		$	322		$	86		$	(408	)	$	271
OWENS CORNING AND SUBSIDIARIES
CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS
FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2012
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
NET EARNINGS (LOSS)	$	(19	)	$	131		$	(52	)	$	(76	)	$	(16	)
Currency translation adjustment	5			—			—			—			5
Pension and other postretirement adjustment (net of tax)	(56		)	—			—			—			(56		)
Deferred income (loss) on hedging (net of tax)	2			—			—			—			2
COMPREHENSIVE EARNINGS (LOSS)	(68		)	131			(52		)	(76		)	(65		)
Less: Comprehensive earnings attributable to noncontrolling interests	—			—			3			—			3
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	(68	)	$	131		$	(55	)	$	(76	)	$	(68	)
OWENS CORNING AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2014
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	—		$	1		$	66		$	—		$	67
Receivables, net	—			—			674			—			674
Due from affiliates	—			2,858			—			(2,858		)	—
Inventories	—			527			290			—			817
Assets held for sale – current	—			—			16			—			16
Other current assets	7			132			94			—			233
Total current assets	7			3,518			1,140			(2,858		)	1,807
Investment in subsidiaries	7,504			2,590			558			(10,652		)	—
Due from affiliates	—			—			881			(881		)	—
Property, plant and equipment, net	359			1,397			1,143			—			2,899
Goodwill	—			1,127			41			—			1,168
Intangible assets	—			989			238			(210		)	1,017
Deferred income taxes	35			380			29			—			444
Other non-current assets	30			62			128			—			220
TOTAL ASSETS	$	7,935		$	10,063		$	4,158		$	(14,601	)	$	7,555
LIABILITIES AND EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	47		$	667		$	235		$	—		$	949
Due to affiliates	1,913			—			945			(2,858		)	—
Short-term debt	—			25			6			—			31
Long-term debt – current portion	—			1			2			—			3
Total current liabilities	1,960			693			1,188			(2,858		)	983
Long-term debt, net of current portion	1,851			15			125			—			1,991
Due to affiliates	—			881			—			(881		)	—
Pension plan liability	310			—			137			—			447
Other employee benefits liability	—			237			15			—			252
Deferred income taxes	—			—			22			—			22
Other liabilities	122			175			43			(210		)	130
OWENS CORNING
STOCKHOLDERS’ EQUITY
Preferred stock	—			—			—			—			—
Common stock	1			—			—			—			1
Additional paid in capital	3,954			6,483			1,927			(8,410		)	3,954
Accumulated earnings	805			1,579			663			(2,242		)	805
Accumulated other comprehensive deficit	(550		)	—			—			—			(550		)
Cost of common stock in treasury	(518		)	—			—			—			(518		)
Total Owens Corning stockholders’ equity	3,692			8,062			2,590			(10,652		)	3,692
Noncontrolling interests	—			—			38			—			38
Total equity	3,692			8,062			2,628			(10,652		)	3,730
TOTAL LIABILITIES AND EQUITY	$	7,935		$	10,063		$	4,158		$	(14,601	)	$	7,555
OWENS CORNING AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2013
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	—		$	3		$	54		$	—		$	57
Receivables, net	—			—			683			—			683
Due from affiliates	—			2,664			—			(2,664		)	—
Inventories	—			487			323			—			810
Assets held for sale – current	—			—			29			—			29
Other current assets	45			140			84			—			269
Total current assets	45			3,294			1,173			(2,664		)	1,848
Investment in subsidiaries	7,229			2,558			558			(10,345		)	—
Due from affiliates	—			67			959			(1,026		)	—
Property, plant and equipment, net	362			1,313			1,257			—			2,932
Goodwill	—			1,127			39			—			1,166
Intangible assets	—			1,015			271			(246		)	1,040
Deferred income taxes	14			416			6			—			436
Other non-current assets	31			64			130			—			225
TOTAL ASSETS	$	7,681		$	9,854		$	4,393		$	(14,281	)	$	7,647
LIABILITIES AND EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	15		$	608		$	365		$	—		$	988
Due to affiliates	1,688			—			976			(2,664		)	—
Short-term debt	—			—			1			—			1
Long-term debt – current portion	—			2			1			—			3
Total current liabilities	1,703			610			1,343			(2,664		)	992
Long-term debt, net of current portion	1,814			26			184			—			2,024
Due to affiliates	—			959			67			(1,026		)	—
Pension plan liability	213			—			123			—			336
Other employee benefits liability	—			226			16			—			242
Deferred income taxes	—			—			23			—			23
Other liabilities	158			246			42			(246		)	200
OWENS CORNING
STOCKHOLDERS’ EQUITY
Preferred stock	—			—			—			—			—
Common stock	1			—			—			—			1
Additional paid in capital	3,938			6,572			2,045			(8,617		)	3,938
Accumulated earnings	655			1,215			513			(1,728		)	655
Accumulated other comprehensive deficit	(297		)	—			—			—			(297		)
Cost of common stock in treasury	(504		)	—			—			—			(504		)
Total Owens Corning stockholders’ equity	3,793			7,787			2,558			(10,345		)	3,793
Noncontrolling interests	—			—			37			—			37
Total equity	3,793			7,787			2,595			(10,345		)	3,830
TOTAL LIABILITIES AND EQUITY	$	7,681		$	9,854		$	4,393		$	(14,281	)	$	7,647
OWENS CORNING AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2014
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES	$	(110	)	$	470		$	81		$	—		$	441
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	(13		)	(219		)	(131		)	—			(363		)
Derivative settlements	—			—			5			—			5
Proceeds from the sale of assets or affiliates	44			—			21			—			65
Investment in subsidiaries and affiliates, net	—			(5		)	(7		)	—			(12		)
Purchases of alloy	—			—			(28		)	—			(28		)
Proceeds from the sale of alloy	4			—			43			—			47
Net cash flow used for investing activities	35			(224		)	(97		)	—			(286		)
NET CASH FLOW USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	1,226			—			50			—			1,276
Payments on senior revolving credit and receivables securitization facilities	(1,238		)	—			(106		)	—			(1,344		)
Proceeds from long-term debt	390			—			—			—			390
Payments on long-term debt	(400		)	—			(2		)	—			(402		)
Dividends paid	(56		)	—			—			—			(56		)
Net increase (decrease) in short-term debt	—			25			5			—			30
Purchases of treasury stock	(44		)	—			—			—			(44		)
Other	8			—			—			—			8
Other intercompany loans	189			(273		)	84			—			—
Net cash flow used for financing activities	75			(248		)	31			—			(142		)
Effect of exchange rate changes on cash	—			—			(3		)	—			(3		)
Net increase in cash and cash equivalents	—			(2		)	12			—			10
Cash and cash equivalents at beginning of period	—			3			54			—			57
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	1		$	66		$	—		$	67
OWENS CORNING AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2013
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES	$	(116	)	$	298		$	225		$	—		$	407
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	(10		)	(143		)	(182		)	—			(335		)
Investment in subsidiaries and affiliates, net	—			(51		)	(11		)	—			(62		)
Proceeds from Hurricane Sandy insurance claims	—			58			—			—			58
Deposit related to sale of Hangzhou, China plant	—			—			34			—			34
Purchases of alloy	—			—			(18		)	—			(18		)
Proceeds from sale of alloy	16			—			—			—			16
Net cash flow used for investing activities	6			(136		)	(177		)	—			(307		)
NET CASH FLOW USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	940			—			123			—			1,063
Payments on senior revolving credit and receivables securitization facilities	(1,002		)	—			(101		)	—			(1,103		)
Payments on long-term debt	—			—			(2		)	—			(2		)
Net increase (decrease) in short-term debt	—			—			(4		)	—			(4		)
Purchases of treasury stock	(63		)	—			—			—			(63		)
Other	13			—			—			—			13
Other intercompany loans	222			(162		)	(60		)	—			—
Net cash flow used for financing activities	110			(162		)	(44		)	—			(96		)
Effect of exchange rate changes on cash	—			—			(2		)	—			(2		)
Net increase in cash and cash equivalents	—			—			2			—			2
Cash and cash equivalents at beginning of period	—			3			52			—			55
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	3		$	54		$	—		$	57
OWENS CORNING AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2012
(in millions)
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries
NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES	$	(108	)	$	239		$	199		$	—		$	330
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	(14		)	(174		)	(116		)	—			(304		)
Proceeds from the sale of assets or affiliates	—			5			5			—			10
Proceeds from Hurricane Sandy insurance claims	—			20			—			—			20
Purchases of alloy	(21		)	—			(7		)	—			(28		)
Proceeds from sale of alloy	42			—			7			—			49
Net cash flow used for investing activities	7			(149		)	(111		)	—			(253		)
NET CASH FLOW USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	1,564			—			313			—			1,877
Payments on senior revolving credit and receivables securitization facilities	(1,627		)	—			(330		)	—			(1,957		)
Proceeds from long-term debt	599			—			—			—			599
Payments on long-term debt	(430		)	—			(11		)	—			(441		)
Purchase of noncontrolling interest	—			(22		)	—			—			(22		)
Net increase (decrease) in short-term debt	(8		)	—			(15		)	—			(23		)
Purchases of treasury stock	(113		)	—			—			—			(113		)
Other	4			—			—			—			4
Other intercompany loans	112			(65		)	(47		)	—			—
Net cash flow used for financing activities	101			(87		)	(90		)	—			(76		)
Effect of exchange rate changes on cash	—			—			2			—			2
Net increase in cash and cash equivalents	—			3			—			—			3
Cash and cash equivalents at beginning of period	—			—			52			—			52
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	3		$	52		$	—		$	55

SCHEDULE_II_VALUATION_AND_QUAL

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES	SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS AND RESERVES FOR THE YEARS ENDED December 31, 2014, 2013 AND 2012
	(in millions)
		Balance at		Charged to			Charged to			Deductions				Acquisitions		Balance
		Beginning		Costs and			Other							and		at End
		of Period		Expenses			Accounts							Divestitures		of Period
	FOR THE YEAR ENDED DECEMBER 31, 2014
	Allowance for doubtful accounts	$	14	$	2		$	—		$	(6	)	(a)	$	—	$	10
	Tax valuation allowance	$	270	$	(15	)	$	(17	)	$	(11	)				$	227
	FOR THE YEAR ENDED DECEMBER 31, 2013
	Allowance for doubtful accounts	$	17	$	3		$	—		$	(6	)	(a)	$	—	$	14
	Tax valuation allowance	$	228	$	46		$	—		$	(4	)		$	—	$	270
	FOR THE YEAR ENDED DECEMBER 31, 2012
	Allowance for doubtful accounts	$	15	$	3		$	—		$	(1	)	(a)	$	—	$	17
	Tax valuation allowance	$	187	$	51		$	—		$	(10	)		$	—	$	228
	(a)	Uncollectible accounts written off, net of recoveries.

BUSINESS_AND_SUMMARY_OF_SIGNIF1

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (POLICIES)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Business Description, General and Basis of Presentation	Description of Business
	Owens Corning, a Delaware corporation, is a leading global producer of glass fiber reinforcements and other materials for composite systems and of residential and commercial building materials. In the fourth quarter of 2014, Owens Corning announced organizational changes to streamline the Company's management structure and reduce costs. As a a result of this action, the Building Materials Group organizational structure was eliminated. The Company now operates within three segments: Composites, which includes the Company’s Reinforcements and Downstream businesses; Insulation and Roofing. Through these lines of business, Owens Corning manufactures and sells products worldwide. The Company maintains leading market positions in all of its major product categories.
	General
	On February 5, 2015, the Board of Directors declared a quarterly dividend of $0.17 per common share payable on April 2, 2015 to shareholders of record as of March 13, 2015.
	In the fourth quarter of 2014, the Company recorded additional income tax expense of $6 million related to prior periods. The effect was not material to the current or any previously issued financial statements.
	In the second quarter of 2014, the Company determined that cash flows from operating activities and cash flows used in financing activities were each overstated by $11 million for the period ended December 31, 2013, due to the misclassification of non-cash debt fair value hedge adjustments. The effect of the misclassification was not material to any previously issued financial statements. The Consolidated Statement of Cash Flows for the twelve months ended December 31, 2013 has been revised to reduce cash flows from operating activities and cash flows used in financing activities by $11 million.
	Basis of Presentation
	Unless the context requires otherwise, the terms “Owens Corning,” “Company,” “we” and “our” in this report refer to Owens Corning and its subsidiaries.
	The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States.
Principles of Consolidation	Principles of Consolidation
	The Consolidated Financial Statements of the Company include the accounts of majority-owned subsidiaries. Intercompany accounts and transactions are eliminated.
Reclassifications	Reclassifications
	Certain reclassifications have been made to the 2013 and 2012 Consolidated Financial Statements and Notes to the Consolidated Financial Statements to conform to the classifications used in 2014.
Use of Estimates and Assumptions	Use of Estimates and Assumptions
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates.
Revenue Recognition	Revenue Recognition
	Revenue is recognized when title and risk of loss pass to the customer and collectability is reasonably assured. Provisions for discounts and rebates to customers, returns, warranties and other adjustments are provided in the same period that the related sales are recorded and are based on historical experience, current conditions and contractual obligations, as applicable.
Cost of Sales	Cost of Sales
	Cost of sales includes material, labor, energy and manufacturing overhead costs, including depreciation and amortization expense associated with the manufacture and distribution of the Company’s products. Distribution costs include inbound freight costs; purchasing and receiving costs; inspection costs; warehousing costs; shipping and handling costs, which include costs incurred relating to preparing, packaging, and shipping products to customers; and other costs of the Company’s distribution network. All shipping and handling costs billed to the customer are included as net sales in the Consolidated Statements of Earnings (Loss).
Marketing and Administrative Expenses	Marketing and Administrative Expenses
	Marketing and administrative expenses include selling and administrative costs, including depreciation and amortization expense, not directly associated with the manufacture and distribution of the Company’s products.
	Included in marketing and administrative expenses are marketing and advertising costs, which are expensed the first time the advertisement takes place. Marketing and advertising costs include advertising, and marketing communications.
Science and Technology Expenses	Science and Technology Expenses
	The Company incurs certain expenses related to science and technology. These expenses include salaries, building and equipment costs, utilities, administrative expenses, materials and supplies associated with the improvement and development of the Company’s products and manufacturing processes. These costs are expensed as incurred.
Earnings (Loss) per Share	Earnings (Loss) per Share
	Basic earnings (loss) per share are computed using the weighted-average number of common shares outstanding during the period. Diluted earnings (loss) per share reflect the dilutive effect of common equivalent shares and increased shares that would result from the conversion of equity securities. The effects of anti-dilution are not presented.
Cash and Cash Equivalents	Cash and Cash Equivalents
	The Company defines cash and cash equivalents as cash and time deposits with original maturities of three months or less when purchased.
Accounts Receivable	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful accounts is an estimate of the amount of probable credit losses in our existing accounts receivable. Account balances are charged off against the allowance when the Company believes it is probable the receivable will not be recovered.
Inventory Valuation	Inventory Valuation
	Inventory costs include material, labor, and manufacturing overhead costs, including depreciation and amortization expense associated with the manufacture and distribution of the Company’s products. Inventories are stated at lower of cost or market value and expense estimates are made for excess and obsolete inventories. Cost is determined by the first-in, first-out (“FIFO”) method.
Investments in Affiliates	Investments in Affiliates
	The Company accounts for investments in affiliates of 20% to 50% ownership when the Company does not have a controlling financial interest using the equity method under which the Company’s share of earnings and losses of the affiliate is reflected in earnings and dividends are credited against the investment in affiliate when declared.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	Goodwill assets are not amortized but are tested for impairment on at least an annual basis. In the current year, as part of the annual assessment, the Company used a quantitative approach to determine whether the fair value of a reporting unit was less than its carrying amount.
	As part of our testing process for goodwill the Company estimates fair values using a discounted cash flow approach from the perspective of a market participant. Significant estimates in the discounted cash flow approach are cash flow forecasts of our reporting units, the discount rate, the terminal business value and the projected income tax rate. The cash flow forecasts of the reporting units are based upon management’s long-term view of our markets and are the forecasts that are used by senior management and the Board of Directors to evaluate operating performance. The discount rate utilized is management’s estimate of what the market’s weighted average cost of capital is for a company with a similar debt rating and stock volatility, as measured by beta. The projected income tax rates utilized are the statutory tax rates for the countries where each reporting unit operates. The terminal business value is determined by applying a business growth factor to the latest year for which a forecast exists. As part of our goodwill quantitative testing process, we would evaluate whether there are reasonably likely changes to management’s estimates that would have a material impact on the results of the goodwill impairment testing.
	Other indefinite-lived intangible assets are not amortized but are tested for impairment on at least an annual basis or when determined to have a finite useful life. Substantially all of the indefinite-lived intangible assets are in trademarks and trade names. The Company uses the royalty relief approach to determine whether it is more likely than not that the fair value of these assets is less than its carrying amount. This review is performed annually, or when circumstances arise which indicate there may be impairment. When applying the royalty relief approach, the Company performs a discounted cash flow analysis based on the value derived from owning these trademarks and trade names and being relieved from paying royalty to third parties. Significant assumptions used include projected cash flows, discount rate, projected income tax rate and terminal business value. These inputs are considered Level 3 inputs under the fair value hierarchy as they are the Company’s own data, and are unobservable in the marketplace.
	Identifiable intangible assets with a determinable useful life are amortized over that determinable life.
Properties and Depreciation	Properties and Depreciation
	Property, plant and equipment are stated at cost and depreciated over their estimated useful lives using the straight-line method. Property, plant and equipment accounts are relieved of the cost and related accumulated depreciation when assets are disposed of or otherwise retired.
	Precious metals used in our production tooling are included in property, plant and equipment and are depleted as they are consumed during the production process. Depletion typically represents an annual expense of less than 3% of the outstanding value and is recorded in cost of sales on the Consolidated Statements of Earnings (Loss).
	For the years ended December 31, 2014, 2013 and 2012 depreciation expense was $283 million, $310 million and $328 million, respectively. In 2013, depreciation expense included $20 million of accelerated depreciation related to the change in useful life of assets recorded as a result of our assessment of the future utility of an incomplete Insulation facility located in Cordele, Georgia. In 2014 and 2013, depreciation expense included $1 million and $9 million of accelerated depreciation related to cost reduction actions further explained in Note 15 to the Consolidated Financial Statements. In 2014, depreciation expense also included $3 million of impairment losses on held for sale assets.
	The range of useful lives for the major components of the Company’s plant and equipment is as follows:
	Buildings and leasehold improvements	15 – 40 years
	Machinery and equipment
	Furnaces	4 – 15 years
	Information systems	5 – 10 years
	Equipment	5 – 20 years
	Expenditures for normal maintenance and repairs are expensed as incurred.
Asset Impairments	Asset Impairments
	The Company evaluates tangible and intangible long-lived assets for impairment when triggering events have occurred. This requires significant assumptions including projected cash flows, projected income tax rate and terminal business value. These inputs are considered Level 3 inputs under the fair value hierarchy as they are the Company’s own data, and are unobservable in the marketplace. Changes in management intentions, market conditions or operating performance could indicate that impairment charges might be necessary that would be material to the Company’s Consolidated Financial Statements in any given period.
Income Taxes	Income Taxes
	The Company recognizes current tax liabilities and assets for the estimated taxes payable or refundable on the tax returns for the current year. Deferred tax balances reflect the impact of temporary differences between the carrying amount of assets and liabilities and their tax basis. Amounts are stated at enacted tax rates expected to be in effect when taxes are actually paid or recovered. In addition, realization of certain deferred tax assets is dependent upon our ability to generate future taxable income. The Company records a valuation allowance to reduce its deferred tax assets to the amount that it believes is more likely than not to be realized. In addition, the Company estimates tax reserves to cover potential taxing authority claims for income taxes and interest attributable to audits of open tax years.
Taxes Collected From Customers and Remitted to Government Authorities and Taxes Paid to Vendors	Taxes Collected from Customers and Remitted to Government Authorities and Taxes Paid to Vendors
	Taxes are assessed by various governmental authorities at different rates on many different types of transactions. The Company charges sales tax or Value Added Tax (“VAT”) on sales to customers where applicable, as well as captures and claims back all available VAT that has been paid on purchases. VAT is recorded in separate payable or receivable accounts and does not affect revenue or cost of sales line items in the income statement. VAT receivable is recorded as a percentage of qualifying purchases at the time the vendor invoice is processed. VAT payable is recorded as a percentage of qualifying sales at the time an Owens Corning sale to a customer subject to VAT occurs. Amounts are paid to the taxing authority according to the method and collection prescribed by local regulations. Where applicable, VAT payable is netted against VAT receivable. The Company also pays sales tax to vendors who include a tax, required by government regulations, to the purchase price charged to the Company.
Pension and Other Postretirement Benefits	Pension and Other Postretirement Benefits
	Accounting for pensions and other postretirement benefits involves estimating the cost of benefits to be provided well into the future and attributing that cost over the time period each employee works. To accomplish this, extensive use is made of assumptions about investment returns, discount rates, inflation, mortality, turnover and medical costs.
Derivative Financial Instruments	Derivative Financial Instruments
	The Company recognizes all derivative instruments as either assets or liabilities at fair value on the balance sheet. To the extent that a derivative is effective as a cash flow hedge, the change in fair value of the derivative is deferred in accumulated other comprehensive income/deficit (“OCI”). Any portion considered to be ineffective is reported in earnings immediately. To the extent that a derivative is effective as a fair value hedge, the change in the fair value of the derivative is offset by the change in the fair value of the item being hedged in the Consolidated Statements of Earnings (Loss). See Note 4 to the Consolidated Financial Statements for further discussion.
Foreign Currency	Foreign Currency
	The functional currency of the Company’s subsidiaries is generally the applicable local currency. Assets and liabilities of foreign subsidiaries are translated into United States dollars at the period-end rate of exchange, and their Statements of Earnings (Loss) and Statements of Cash Flows are converted on an ongoing basis at the monthly average rate. The resulting translation adjustment is included in accumulated OCI in the Consolidated Balance Sheets and Consolidated Statements of Stockholders’ Equity. Transaction gains and losses that arise from exchange rate fluctuations on transactions denominated in a currency other than the functional currency are included in the Consolidated Statements of Earnings (Loss) as incurred.
Accounting Pronouncements	Accounting Pronouncements
	In January 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" ("ASU 2014-08"). ASU 2014-08 changes the criteria for reporting discontinued operations and requires new disclosures for discontinued operations and for significant disposals of components of an entity that do not qualify for discontinued operations reporting. The adoption impacted the presentation of the consolidated financial statements related to disposals in 2014.
	In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” (“ASU 2014-09”). ASU 2014-09 outlines a new, single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. This new revenue recognition model provides a five-step analysis in determining when and how revenue is recognized. The new model will require revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration a company expects to receive in exchange for those goods or services. The Company is currently assessing the impact that adopting this new accounting guidance will have on its consolidated financial statements and footnote disclosures. ASU 2014-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is not permitted. Accordingly, the standard is effective for the Company on January 1, 2017.

BUSINESS_AND_SUMMARY_OF_SIGNIF2

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (TABLE)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Property, Plant and Equipment	The range of useful lives for the major components of the Company’s plant and equipment is as follows:
	Buildings and leasehold improvements	15 – 40 years
	Machinery and equipment
	Furnaces	4 – 15 years
	Information systems	5 – 10 years
	Equipment	5 – 20 years
	Property, plant and equipment consist of the following (in millions):
		December 31, 2014			December 31, 2013
	Land	$	196		$	210
	Buildings and leasehold improvements	789			811
	Machinery and equipment	3,405			3,353
	Construction in progress	233			173
		4,623			4,547
	Accumulated depreciation	(1,724		)	(1,615		)
	Property, plant and equipment, net	$	2,899		$	2,932

SEGMENT_INFORMATION_TABLE

SEGMENT INFORMATION (TABLE)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	The following table summarizes our net sales by segment and geographic region (in millions). External customer sales are attributed to geographic region based upon the location from which the product is shipped to the external customer.
		Twelve Months Ended December 31,
		2014			2013			2012
	Reportable Segments
	Composites	$	1,935		$	1,845		$	1,859
	Insulation	1,746			1,642			1,468
	Roofing	1,748			1,967			2,014
	Total reportable segments	5,429			5,454			5,341
	Corporate eliminations	(153		)	(159		)	(169		)
	NET SALES	$	5,276		$	5,295		$	5,172
Schedule of Revenues by Geographical Areas
	External Customer Sales by Geographic Region
	United States	$	3,557		$	3,644		$	3,504
	Europe	575			545			558
	Asia Pacific	636			627			639
	Canada and other	508			479			471
	NET SALES	$	5,276		$	5,295		$	5,172
Schedule of Earnings before Interest and Taxes	The following table summarizes EBIT by segment (in millions):
		Twelve Months Ended December 31,
		2014			2013			2012
	Reportable Segments
	Composites	$	149		$	98		$	91
	Insulation	108			40			-38
	Roofing	232			386			331
	Total reportable segments	489			524			384
	Charges related to cost reduction actions	(37		)	(8		)	(51		)
	Other items related to cost reduction actions	1			(18		)	(85		)
	Net loss on sale of European Stone Business	(20		)	—			—
	Impairment loss on Alcala, Spain facility held for sale	(3		)	—			—
	Gain on sale of Hangzhou, China facility	45			—			—
	Net gain (loss) related to Hurricane Sandy insurance activity	(6		)	15			(9		)
	Accelerated depreciation related to a change in the useful life of assets at our incomplete Cordele, Georgia facility	—			(20		)	—
	General corporate expense	(77		)	(108		)	(91		)
	EBIT	$	392		$	385		$	148
Reconciliation of Assets from Segment to Consolidated	The following table summarizes total assets by segment and property, plant and equipment by geographic region (in millions):
		December 31,
	TOTAL ASSETS	2014			2013
	Reportable Segments
	Composites	$	2,387		$	2,417
	Insulation	2,844			2,858
	Roofing	1,138			1,153
	Total reportable segments	6,369			6,428
	Cash and cash equivalents	67			57
	Current and noncurrent Deferred income taxes	580			573
	Investments in affiliates	53			51
	Assets held for sale – current	16			29
	Corporate property, plant and equipment, other assets and eliminations	470			509
	CONSOLIDATED TOTAL ASSETS	$	7,555		$	7,647
Schedule of Property, Plant and Equipment by Geographical Areas
		December 31,
	PROPERTY, PLANT AND EQUIPMENT BY GEOGRAPHIC REGION	2014			2013
	United States	$	1,773		$	1,688
	Europe	404			520
	Canada	111			131
	Asia Pacific	377			375
	Other	234			218
	TOTAL PROPERTY, PLANT AND EQUIPMENT	$	2,899		$	2,932
Schedule of Depreciation and Amortization by Segment	The following table summarizes the provision for depreciation and amortization by segment (in millions):
		Twelve Months Ended December 31,
		2014			2013			2012
	Reportable Segments
	Composites	$	129		$	130		$	123
	Insulation	101			104			105
	Roofing	39			38			38
	Total reportable segments	269			272			266
	General corporate depreciation and amortization (a)	35			60			83
	CONSOLIDATED PROVISION FOR DEPRECIATION AND AMORTIZATION	$	304		$	332		$	349
	(a)	2014 includes $1 million of accelerated depreciation related to our decision to close a facility in Japan and optimize a facility in Canada. 2013 includes $9 million of accelerated depreciation related to cost reduction actions and $20 million of accelerated depreciation related to the change in useful life of assets recorded as a result of our assessment of the future utility of an incomplete Insulation facility located in Cordele, Georgia. 2012 includes $55 million of accelerated depreciation charges related to cost reduction actions.
Schedule of Additions to Property, Plant and Equipment by Segment	The following table summarizes additions to property, plant and equipment by segment (in millions):
		Twelve Months Ended December 31,
		2014			2013			2012
	Reportable Segments
	Composites	$	239		$	155		$	167
	Insulation	78			107			86
	Roofing	41			60			41
	Total reportable segments	358			322			294
	General corporate additions	33			31			38
	CONSOLIDATED ADDITIONS TO PROPERTY, PLANT AND EQUIPMENT	$	391		$	353		$	332

INVENTORIES_TABLE

INVENTORIES (TABLE)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	Inventories consist of the following (in millions):
		December 31,
		2014		2013
	Finished goods	$	568	$	580
	Materials and supplies	249		230
	Total inventories	$	817	$	810

DERIVATIVE_FINANCIAL_INSTRUMEN1

DERIVATIVE FINANCIAL INSTRUMENTS (TABLE)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Assets and Liabilities at Fair Value	The following table presents the fair value and respective location of derivatives and hedging instruments on the Consolidated Balance Sheets (in millions):
			Fair Value at
		Location	December 31, 2014			December 31, 2013
	Derivative assets designated as hedging instruments:
	Cash flow hedges:
	Natural gas, electricity, and foreign exchange contracts	Other current assets	$	—		$	1
	Amount of gain recognized in OCI (effective portion)	OCI	$	—		$	1
	Derivative liabilities designated as hedging instruments:
	Cash flow hedges:
	Natural gas, electricity, and foreign exchange contracts	Accounts payable and	$	9		$	—
		accrued liabilities
	Amount of loss recognized in OCI (effective portion)	OCI	$	8		$	—
	Fair value hedges:
	Interest rate swaps	Other Liabilities	$	(3	)	$	3
	Derivative assets not designated as hedging instruments:
	Foreign exchange contracts	Other current assets	$	1		$	—
	Derivative liabilities not designated as hedging instruments:
	Foreign exchange contracts	Accounts payable and	$	2		$	1
		accrued liabilities
Schedule of Fair Value Derivative Instruments Statements of Earnings Location	The following table presents the impact and respective location of derivative activities on the Consolidated Statements of Earnings (Loss) (in millions):
			Twelve Months Ended December 31,
		Location	2014			2013			2012
	Derivative activity designated as hedging instruments:
	Natural gas and electricity:
	Amount of loss reclassified from OCI into earnings (effective portion)	Cost of sales	$	—		$	1		$	5
	Interest rate swaps:
	Amount of (gain) loss recognized in earnings (ineffective portion)	Interest	$	—		$	(1	)	$	—
		expense, net
	Derivative activity not designated as hedging instruments:
	Natural gas and electricity:
	Amount of (gain) loss recognized in earnings	Other expenses	$	1		$	—		$	—
		(income), net
	Foreign currency exchange contract:
	Amount of (gain) loss recognized in earnings (a)	Other expenses	$	1		$	12		$	17
		(income), net
	(a)	(Gains) / losses related to foreign currency derivatives were substantially offset by net revaluation impacts on foreign denominated balance sheet exposures, which were also recorded in Other (income) expenses, net.

GOODWILL_AND_OTHER_INTANGIBLE_1

GOODWILL AND OTHER INTANGIBLE ASSETS (TABLE)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	Intangible assets and goodwill consist of the following (in millions):
	31-Dec-14	Weighted		Gross				Accumulated				Net
		Average		Carrying				Amortization				Carrying
		Useful		Amount								Amount
		Life
	Amortizable intangible assets:
	Customer relationships	19		$	172			$	(72	)		$	100
	Technology	20		193				(83		)		110
	Franchise and other agreements	12		39				(18		)		21
	Indefinite-lived intangible assets:
	Trademarks			786				—				786
	Total intangible assets			$	1,190			$	(173	)		$	1,017
	Goodwill			$	1,168
	31-Dec-13	Weighted		Gross				Accumulated				Net
		Average		Carrying				Amortization				Carrying
		Useful		Amount								Amount
		Life
	Amortizable intangible assets:
	Customer relationships	19		$	181			$	(68	)		$	113
	Technology	20		194				(74		)		120
	Franchise and other agreements	14		37				(16		)		21
	Indefinite-lived intangible assets:
	Trademarks			786				—				786
	Total intangible assets			$	1,198			$	(158	)		$	1,040
	Goodwill			$	1,166
Schedule of Finite-Lived Intangible Assets	The changes in the gross carrying amount of amortizable intangible assets by asset group are as follows (in millions):
		Customer relationships				Technology				Franchise and other agreements				Trademarks		Total
	Balance at December 31, 2013	$	181			$	194			$	37			$	786	$	1,198
	Acquisitions (see Note 9)	4				—				1				—		5
	Additional Franchises and Agreements	—				—				1				—		1
	Divestiture (see Note 10)	(13		)		(1		)		—				—		(14		)
	Balance at December 31, 2014	$	172			$	193			$	39			$	786	$	1,190
Schedule of Goodwill	The changes in the net carrying amount of goodwill by segment are as follows (in millions):
		Composites				Insulation				Roofing				Total
	Balance at December 31, 2013	$	57			$	886			$	223			$	1,166
	Acquisitions (see Note 9)	—				2				—				2
	Balance at December 31, 2014	$	57			$	888			$	223			$	1,168

PROPERTY_PLANT_AND_EQUIPMENT_T

PROPERTY, PLANT AND EQUIPMENT (TABLE)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The range of useful lives for the major components of the Company’s plant and equipment is as follows:
	Buildings and leasehold improvements	15 – 40 years
	Machinery and equipment
	Furnaces	4 – 15 years
	Information systems	5 – 10 years
	Equipment	5 – 20 years
	Property, plant and equipment consist of the following (in millions):
		December 31, 2014			December 31, 2013
	Land	$	196		$	210
	Buildings and leasehold improvements	789			811
	Machinery and equipment	3,405			3,353
	Construction in progress	233			173
		4,623			4,547
	Accumulated depreciation	(1,724		)	(1,615		)
	Property, plant and equipment, net	$	2,899		$	2,932

CHANGES_IN_NONCONTROLLING_INTE1

CHANGES IN NONCONTROLLING INTERESTS (TABLE)	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest [Abstract]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net	The following table discloses the changes in noncontrolling interests on Owens Corning stockholders’ equity and effects on net earnings attributable to Owens Corning (in millions):
		Twelve Months Ended December 31,
		2014		2013		2012
	Net earnings (loss) attributable to Owens Corning	$	226	$	204	$	(19	)
	Increase (decrease) in Owens Corning additional paid in capital for NEI purchase agreement	—		—		(16		)
	Change from net earnings (loss) attributable to Owens Corning and change in noncontrolling interests	$	226	$	204	$	(35	)

INVESTMENTS_IN_AFFILIATES_TABL

INVESTMENTS IN AFFILIATES (TABLE)	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Ownership Percentage in Affiliates	At December 31, 2014 and 2013, the Company’s ownership percentage in affiliates, which generally are engaged in the manufacture of fibrous glass and related products for the insulation, construction, reinforcements, and textile markets, included:
		December 31,
		2014		2013
	Arabian Fiberglass Insulation Company, Ltd. (Saudi Arabia)	49	%	49	%
	Fiberteq LLC (United States)	50	%	50	%
	Neptco LLC (United States)	0	%	50	%
Summarized Balance Sheet Information of Affiliates	The following tables provide summarized financial information on a combined 100% basis for the Company’s affiliates accounted for under the equity method (in millions):
		December 31,
		2014			2013
	Current assets	$	50		$	50
	Non-current assets	$	91		$	90
	Current liabilities	$	36		$	25
	Non-current liabilities	$	11		$	23
Summarized Statement of Earnings Information of Affiliates
		Twelve Months Ended December 31,
		2014			2013		2012
	Net sales	$	143		$	138	$	140
	Gross margin	$	11		$	7	$	11
	Net earnings	$	5		$	1	$	5

OPERATING_LEASES_TABLE

OPERATING LEASES (TABLE)	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	At December 31, 2014, the minimum future rental commitments under non-cancelable operating leases with initial maturities greater than one year payable over the remaining lives of the leases are (in millions):
	Period	Minimum
		Future Rental
		Commitments
	2015	$	53
	2016	$	44
	2017	$	32
	2018	$	20
	2019	$	14
	2020 and beyond	$	37

ACCOUNTS_PAYABLE_AND_ACCRUED_L1

ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (TABLE)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities consist of the following (in millions):
		December 31,
		2014		2013
	Accounts payable	$	542	$	547
	Payroll, vacation pay, and incentive compensation	112		161
	Payroll, property, and other taxes	93		95
	Other employee benefits liabilities	38		39
	Dividends payable	19		—
	Warranties (current portion)	17		19
	Legal and audit fees	8		7
	Accrued interest	9		8
	Charges related to cost reduction actions	36		32
	Deferred acquisition payments	—		5
	Other	75		75
	Total	$	949	$	988

WARRANTIES_TABLE

WARRANTIES (TABLE)	12 Months Ended
	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability	A reconciliation of the warranty liability is as follows (in millions):
		December 31,
		2014			2013
	Beginning balance	$	41		$	41
	Amounts accrued for current year	25			23
	Settlements of warranty claims	(26		)	(23		)
	Ending balance	$	40		$	41

COST_REDUCTION_ACTIONS_TABLE

COST REDUCTION ACTIONS (TABLE)	12 Months Ended
	Dec. 31, 2014
Cost Reductions Actions 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the status of the unpaid liabilities from the Company’s 2014 cost reduction actions (in millions):
		Beginning		Costs			Payments		Foreign Currency Translation			Ending		Cumulative
		Balance		Incurred								Balance		Charges
		December 31,										December 31,		Incurred
		2013										2014
	Severance	$	—	$	36		$	3	$	(2	)	$	31	$	36
	Contract Termination	—		3			—		—			3		3
	Total	$	—	$	39		$	3	$	(2	)	$	34	$	39
Cost Reduction Actions 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the status of the unpaid liabilities from the Company’s 2013 cost reduction actions (in millions):
		Beginning		Costs			Payments		Foreign Currency Translation			Ending		Cumulative
		Balance		Incurred								Balance		Charges
		December 31,										December 31,		Incurred
		2013										2014
	Severance	$	6	$	(2	)	$	4	$	—		$	—	$	4
	Total	$	6	$	(2	)	$	4	$	—		$	—	$	4
Cost Reduction Actions 2012 [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the status of the unpaid liabilities from the Company’s 2012 cost reduction actions (in millions):
		Beginning		Costs			Payments		Foreign Currency Translation			Ending		Cumulative
		Balance		Incurred								Balance		Charges
		December 31,										December 31,		Incurred
		2013										2014
	Severance	$	26	$	—		$	23	$	(1	)	$	2	$	53
	Total	$	26	$	—		$	23	$	(1	)	$	2	$	53

DEBT_TABLE

DEBT (TABLE)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Details of the Company’s outstanding long-term debt are as follows (in millions):
		December 31, 2014		December 31, 2013
	6.50% senior notes, net of discount, due 2016	$	158	$	400
	9.00% senior notes, net of discount, due 2019	143		248
	4.20% senior notes, net of discount, due 2022	600		599
	4.20% senior notes, net of discount, due 2024	392		—
	7.00% senior notes, net of discount, due 2036	540		540
	Accounts receivable securitization facility, maturing in 2016	106		162
	Senior revolving credit facility, maturing in 2018	—		12
	Various capital leases, due through and beyond 2050	47		49
	Various floating rate debt, maturing through 2017	—		1
	Fair value adjustment to debt	8		16
	Total long-term debt	1,994		2,027
	Less – current portion	3		3
	Long-term debt, net of current portion	$	1,991	$	2,024
Schedule of Maturities of Long-term Debt	The effects of the interest rate swap are not included in the table below.
	Period	Maturities
	2015	$	7
	2016	269
	2017	4
	2018	4
	2019	147
	2020 and beyond	1,563
	Total	$	1,994

PENSION_PLANS_TABLE

PENSION PLANS (TABLE)	12 Months Ended
	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Changes in Projected Benefit Obligations	The following tables provide a reconciliation of the change in the projected benefit obligation, the change in plan assets and the net amount recognized in the Consolidated Balance Sheets for the years ended December 31, 2014 and 2013 (in millions):
		December 31, 2014											December 31, 2013
		U.S.				Non-U.S.			Total				U.S.			Non-U.S.			Total
	Change in Projected Benefit Obligation
	Benefit obligation at beginning of period	$	1,070			$	546		$	1,616			$	1,187		$	554		$	1,741
	Service cost	8				5			13				9			6			15
	Interest cost	48				23			71				44			21			65
	Actuarial (gain) loss	159				63			222				(91		)	3			(88		)
	Currency (gain) loss	—				(44		)	(44		)		—			(8		)	(8		)
	Benefits paid	(92		)		(23		)	(115		)		(79		)	(21		)	(100		)
	Settlements / Curtailments	—				(2		)	(2		)		—			(7		)	(7		)
	Other	—				(4		)	(4		)		—			(2		)	(2		)
	Benefit obligation at end of period	$	1,193			$	564		$	1,757			$	1,070		$	546		$	1,616
Schedule of Changes in Fair Value of Plan Assets
		December 31, 2014											December 31, 2013
		U.S.				Non-U.S.			Total				U.S.			Non-U.S.			Total
	Change in Plan Assets
	Fair value of assets at beginning of period	$	858			$	422		$	1,280			$	856		$	404		$	1,260
	Actual return on plan assets	82				50			132				60			35			95
	Currency gain (loss)	—				(35		)	(35		)		—			(9		)	(9		)
	Company contributions	36				16			52				20			20			40
	Benefits paid	(92		)		(23		)	(115		)		(79		)	(21		)	(100		)
	Settlements/curtailments	—				(2		)	(2		)		—			(7		)	(7		)
	Other	(1		)		2			1				1			—			1
	Fair value of assets at end of period	$	883			$	430		$	1,313			$	858		$	422		$	1,280
	Funded status	$	(310	)		$	(134	)	$	(444	)		$	(212	)	$	(124	)	$	(336	)
Schedule of Amounts Recognized in Balance Sheet
		December 31, 2014											December 31, 2013
		U.S.				Non-U.S.			Total				U.S.			Non-U.S.			Total
	Amounts Recognized in the Consolidated Balance Sheets
	Prepaid pension cost	$	—			$	5		$	5			$	—		$	2		$	2
	Accrued pension cost – current	(1		)		(1		)	(2		)		—			(2		)	(2		)
	Accrued pension cost – non-current	(309		)		(138		)	(447		)		(212		)	(124		)	(336		)
	Net amount recognized	$	(310	)		$	(134	)	$	(444	)		$	(212	)	$	(124	)	$	(336	)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
	Amounts Recorded in Accumulated OCI
	Net actuarial loss	$	(415	)		$	(107	)	$	(522	)		$	(289	)	$	(78	)	$	(367	)
Schedule of Assumptions Used to Determine Benefit Obligations	The following table presents weighted average assumptions used to determine benefit obligations at the measurement dates noted:
		December 31,
		2014			2013
	United States Plans
	Discount rate	3.85	%		4.65	%
	Expected return on plan assets	7	%		7	%
	Non-United States Plans
	Discount rate	3.6	%		4.45	%
	Expected return on plan assets	6.27	%		6.38	%
	Rate of compensation increase	4.01	%		3.94	%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets	The following table presents information about the projected benefit obligation, accumulated benefit obligation (“ABO”) and plan assets of the Company’s pension plans (in millions):
		December 31, 2014											December 31, 2013
		U.S.				Non-U.S.			Total				U.S.			Non-U.S.			Total
	Plans with ABO in excess of fair value
	of plan assets:
	Projected benefit obligation	$	1,193			$	457		$	1,650			$	1,070		$	414		$	1,484
	Accumulated benefit obligation	$	1,193			$	441		$	1,634			$	1,070		$	400		$	1,470
	Fair value of plan assets	$	883			$	321		$	1,204			$	858		$	293		$	1,151
	Plans with fair value of assets in excess of ABO:
	Projected benefit obligation	$	—			$	107		$	107			$	—		$	132		$	132
	Accumulated benefit obligation	$	—			$	99		$	99			$	—		$	121		$	121
	Fair value of plan assets	$	—			$	109		$	109			$	—		$	129		$	129
	Total projected benefit obligation	$	1,193			$	564		$	1,757			$	1,070		$	546		$	1,616
	Total accumulated benefit obligation	$	1,193			$	540		$	1,733			$	1,070		$	521		$	1,591
	Total plan assets	$	883			$	430		$	1,313			$	858		$	422		$	1,280
Schedule of Net Benefit Costs	The following table presents the components of net periodic pension cost for the periods noted (in millions):
		Twelve Months Ended December 31,
		2014				2013			2012
	Service cost	$	13			$	15		$	15
	Interest cost	71				65			72
	Expected return on plan assets	(84		)		(84		)	(86		)
	Amortization of actuarial loss	11				20			29
	Net periodic benefit cost	$	11			$	16		$	30
Schedule of Assumptions Used to Determine Net Benefit Cost	The following table presents weighted-average assumptions used to determine net periodic pension costs for the periods noted:
		Twelve Months Ended December 31,
		2014					2013				2012
	United States Plans
	Discount rate	4.65	%				3.8	%			4.6	%
	Expected return on plan assets	7	%				7.5	%			7.25	%
	Rate of compensation increase	N/A			(a)		N/A		(a)		N/A			(a)
	Non-United States Plans
	Discount rate	4.45	%				4.1	%			4.65	%
	Expected return on plan assets	6.38	%				6.13	%			7.23	%
	Rate of compensation increase	3.94	%				3.5	%			3.75	%
	(a)	Not applicable due to changes in plan made on August 1, 2009 that were effective beginning January 1, 2010.
Schedule of Expected Benefit Payments	The following table shows estimated future benefit payments from the Company’s pension plans (in millions):
	Year		Estimated
			Benefit
			Payments
	2015		$106
	2016		$102
	2017		$103
	2018		$101
	2019		$103
	2020-2023		$509
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Allocation of Plan Assets	The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall under United States pension plan assets at December 31, 2014 and 2013 (in millions):
		2014
	Asset Category	Level 1				Level 2			Level 3				Total
	Equity
	Domestic actively managed	$	99			$	39		$	—			$	138
	Domestic passive index	—				61			—				61
	International actively managed	81				34			—				115
	International passive index	—				26			—				26
	Fixed income and cash equivalents
	Cash	2				—			—				2
	Short-term debt	—				26			—				26
	Corporate bonds	229				55			—				284
	Government debt	98				—			—				98
	Real estate investment trusts	28				—			—				28
	Absolute return strategies	—				55			—				55
	Real assets	—				50			—				50
	Total United States plan assets	$	537			$	346		$	—			$	883
		2013
	Asset Category	Level 1				Level 2			Level 3				Total
	Equity
	Domestic actively managed	$	100			$	38		$	—			$	138
	Domestic passive index	—				58			—				58
	International actively managed	85				36			—				121
	International passive index	—				25			—				25
	Fixed income and cash equivalents
	Short-term debt	—				27			—				27
	Corporate bonds	213				54			—				267
	Government debt	91				—			—				91
	Real estate investment trusts	26				—			—				26
	Absolute return strategies	—				80			—				80
	Real assets	—				25			—				25
	Total United States plan assets	$	515			$	343		$	—			$	858
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Allocation of Plan Assets	The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall under non-United States pension plan assets at December 31, 2014 and 2013 (in millions):
		2014
	Asset Category	Level 1				Level 2			Level 3				Total
	Equity
	Domestic actively managed	$	—			$	30		$	—			$	30
	Domestic passive index	—				—			—				—
	International actively managed	—				51			—				51
	International passive index	—				35			—				35
	Fixed income and cash equivalents
	Cash and cash equivalents	—				28			—				28
	Corporate bonds	—				193			—				193
	Government Debt	—				—			—				—
	Absolute return strategies	—				93			—				93
	Total non-United States plan assets	$	—			$	430		$	—			$	430
		2013
	Asset Category	Level 1				Level 2			Level 3				Total
	Equity
	Domestic actively managed	$	—			$	34		$	—			$	34
	Domestic passive index	—				4			—				4
	International actively managed	—				61			—				61
	International passive index	—				28			—				28
	Fixed income and cash equivalents
	Cash and cash equivalents	3				22			—				25
	Corporate bonds	—				162			—				162
	Government Debt	—				7			—				7
	Absolute return strategies	—				101			—				101
	Total non-United States plan assets	$	3			$	419		$	—			$	422

POSTEMPLOYMENT_AND_POSTRETIREM1

POSTEMPLOYMENT AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS (TABLE)	12 Months Ended
	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Changes in Projected Benefit Obligations	The following tables provide a reconciliation of the change in the projected benefit obligation, the change in plan assets and the net amount recognized in the Consolidated Balance Sheets for the years ended December 31, 2014 and 2013 (in millions):
		December 31, 2014											December 31, 2013
		U.S.				Non-U.S.				Total			U.S.			Non-U.S.			Total
	Change in Projected Benefit Obligation
	Benefit obligation at beginning of period	$	1,070			$	546			$	1,616		$	1,187		$	554		$	1,741
	Service cost	8				5				13			9			6			15
	Interest cost	48				23				71			44			21			65
	Actuarial (gain) loss	159				63				222			(91		)	3			(88		)
	Currency (gain) loss	—				(44		)		(44		)	—			(8		)	(8		)
	Benefits paid	(92		)		(23		)		(115		)	(79		)	(21		)	(100		)
	Settlements / Curtailments	—				(2		)		(2		)	—			(7		)	(7		)
	Other	—				(4		)		(4		)	—			(2		)	(2		)
	Benefit obligation at end of period	$	1,193			$	564			$	1,757		$	1,070		$	546		$	1,616
Schedule of Amounts Recognized in Balance Sheet
		December 31, 2014											December 31, 2013
		U.S.				Non-U.S.				Total			U.S.			Non-U.S.			Total
	Amounts Recognized in the Consolidated Balance Sheets
	Prepaid pension cost	$	—			$	5			$	5		$	—		$	2		$	2
	Accrued pension cost – current	(1		)		(1		)		(2		)	—			(2		)	(2		)
	Accrued pension cost – non-current	(309		)		(138		)		(447		)	(212		)	(124		)	(336		)
	Net amount recognized	$	(310	)		$	(134	)		$	(444	)	$	(212	)	$	(124	)	$	(336	)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
	Amounts Recorded in Accumulated OCI
	Net actuarial loss	$	(415	)		$	(107	)		$	(522	)	$	(289	)	$	(78	)	$	(367	)
Schedule of Assumptions Used to Determine Benefit Obligations	The following table presents weighted average assumptions used to determine benefit obligations at the measurement dates noted:
		December 31,
		2014			2013
	United States Plans
	Discount rate	3.85	%		4.65	%
	Expected return on plan assets	7	%		7	%
	Non-United States Plans
	Discount rate	3.6	%		4.45	%
	Expected return on plan assets	6.27	%		6.38	%
	Rate of compensation increase	4.01	%		3.94	%
Other Postretirement Benefits Other Than Pensions [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Changes in Projected Benefit Obligations	The following table provides a reconciliation of the change in the projected benefit obligation and the net amount recognized in the Consolidated Balance Sheets for the years ended December 31, 2014 and 2013 (in millions):
		December 31, 2014											December 31, 2013
		U.S.				Non-U.S.				Total			U.S.			Non-U.S.			Total
	Change in Projected Benefit Obligation
	Benefit obligation at beginning of period	$	228			$	16			$	244		$	252		$	21		$	273
	Service cost	2				—				2			2			1			3
	Interest cost	9				1				10			8			1			9
	Actuarial loss (gain)	17				—				17			(18		)	(2		)	(20		)
	Currency loss (gain)	—				(1		)		(1		)	—			—			—
	Plan amendments	—				—				—			—			—			—
	Benefits paid	(18		)		(1		)		(19		)	(18		)	(2		)	(20		)
	Other	—				1				1			2			(3		)	(1		)
	Benefit obligation at end of period	$	238			$	16			$	254		$	228		$	16		$	244
	Funded status	$	(238	)		$	(16	)		$	(254	)	$	(228	)	$	(16	)	$	(244	)
Schedule of Amounts Recognized in Balance Sheet
	Amounts Recognized in the Consolidated
	Balance Sheets
	Accrued benefit obligation – current	$	(18	)		$	(1	)		$	(19	)	$	(20	)	$	—		$	(20	)
	Accrued benefit obligation – non-current	(220		)		(15		)		(235		)	(208		)	(16		)	(224		)
	Net amount recognized	$	(238	)		$	(16	)		$	(254	)	$	(228	)	$	(16	)	$	(244	)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
	Amounts Recorded in Accumulated OCI
	Net actuarial gain	$	(20	)		$	—			$	(20	)	$	21		$	6		$	27
	Net prior service credit	(2		)		(5		)		(7		)	24			—			24
	Net amount recognized	$	(22	)		$	(5	)		$	(27	)	$	45		$	6		$	51
Schedule of Assumptions Used to Determine Benefit Obligations	The following table presents the discount rates used to determine the benefit obligations:
		December 31,
		2014			2013
	United States plans	3.7	%		4.35	%
	Non-United States plans	3.7	%		4.45	%
Schedule of Net Benefit Costs	The following table presents the components of net periodic postretirement benefit cost (in millions):
		Twelve Months Ended December 31,
		2014				2013				2012
	Service cost	$	2			$	3			$	3
	Interest cost	10				9				11
	Amortization of prior service cost	(4		)		(4		)		(4		)
	Amortization of actuarial gain	(2		)		(1		)		(3		)
	Curtailment gain	—				—				(1		)
	Net periodic postretirement benefit cost	$	6			$	7			$	6
Schedule of Assumptions Used to Determine Net Benefit Cost	The following table presents the discount rates used to determine net periodic postretirement benefit cost:
		Twelve Months Ended December 31,
		2014			2013			2012
	United States plans	4.35	%		3.5	%		4.35	%
	Non-United States plans	4.45	%		3.8	%		4.1	%
Schedule of Health Care Cost Trend Rates	The following table presents health care cost trend rates used to determine net periodic postretirement benefit cost, as well as information regarding the ultimate rate and the year in which their ultimate rate is reached:
		Twelve Months Ended December 31,
		2014			2013			2012
	United States plans
	Initial rate at end of year	7	%		7	%		7	%
	Ultimate rate	5	%		5	%		5	%
	Year in which ultimate rate is reached	2024			2023			2022
	Non-United States plans
	Initial rate at end of year	5.43	%		6.23	%		6.5	%
	Ultimate rate	4.7	%		4.79	%		4.8	%
	Year in which ultimate rate is reached	2019			2019			2019
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]	To illustrate, a one-percentage point change in the December 31, 2014 assumed health care cost trend rate would have the following effects (in millions):
		1-Percentage Point
		Increase				Decrease
	Increase (decrease) in total service cost and interest cost components of net periodic postretirement benefit cost	$	1			$	—
	Increase (decrease) of accumulated postretirement benefit obligation	$	10			$	(8	)
Schedule of Expected Benefit Payments	The following table shows estimated future benefit payments from the Company’s postretirement benefit plans (in millions):
	Year	Estimated
		Benefit
		Payments
	2015	$	19
	2016	$	20
	2017	$	20
	2018	$	19
	2019	$	19
	2020-2024	$	88

STOCK_COMPENSATION_TABLE

STOCK COMPENSATION (TABLE)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	The following table summarizes the Company’s stock option activity:
		Twelve Months Ended December 31, 2014					Twelve Months Ended December 31, 2013					Twelve Months Ended December 31, 2012
		Number of		Weighted-			Number of		Weighted-			Number of			Weighted-
		Options		Average			Options		Average			Options			Average
				Exercise Price					Exercise Price						Exercise Price
	Beginning Balance	2,748,720		$	29.55		3,025,220		$	27.78		3,293,545			$	26.26
	Granted	374,500		37.65			329,800		42.16			409,700			33.73
	Exercised	(328,875	)	25.23			(549,800	)	26.88			(520,120	)		22.65
	Forfeited	(35,400	)	38.09			(56,500	)	34.58			(157,905	)		28.48
	Expired	(4,050	)	34.5			—		—			—			—
	Ending Balance	2,754,895		$	31.04		2,748,720		$	29.55		3,025,220			$	27.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable	The following table summarizes information about the Company’s options outstanding and exercisable:
	Options Outstanding								Options Exercisable
					Weighted-Average				Number		Weighted-Average
									Exercisable at
	Range of		Options		Remaining	Exercise Price			Dec. 31, 2014		Remaining		Exercise Price
	Exercise		Outstanding		Contractual						Contractual
	Prices				Life						Life
	$13.89 - $42.16		2,754,895		4.99	$	31.04		1,934,695		3.72		$	28.18
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	A summary of the status of the Company’s plans that had restricted stock issued as of December 31, 2014, 2013 and 2012 and changes during the twelve months ended December 31, 2014, 2013 and 2012 are presented below:
		Twelve Months Ended December 31, 2014					Twelve Months Ended December 31, 2013					Twelve Months Ended December 31, 2012
		Number of		Weighted-			Number of		Weighted-			Number of			Weighted-
		Shares		Average			Shares		Average			Shares			Average
				Grant Date					Grant Date						Grant Date
				Fair Value					Fair Value						Fair Value
	Beginning Balance	1,735,824		$	32.49		1,875,065		$	27.14		1,941,742			$	23.83
	Granted	522,994		36.72			512,398		41.01			638,618			33.43
	Vested	(459,359	)	32.49			(573,920	)	26			(544,528	)		22.38
	Forfeited	(71,718	)	37.17			(77,719	)	34.62			(160,767	)		28.36
	Ending Balance	1,727,741		$	33.58		1,735,824		$	32.49		1,875,065			$	27.14
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest
		Twelve Months Ended December 31, 2014					Twelve Months Ended December 31, 2013					Twelve Months Ended December 31, 2012
		Number of		Weighted-			Number of		Weighted-			Number of			Weighted-
		PSUs		Average			PSUs		Average			PSUs			Average
				Grant Date					Grant  Date						Grant  Date
				Fair Value					Fair Value						Fair Value
	Beginning Balance	410,500		$	53.04		412,910		$	49.14		508,616			$	42.24
	Granted	248,950		44.43			207,050		56.71			256,400			47.97
	Vested	(199,450	)	52.11			(167,610	)	48.61			(260,580	)		36.52
	Forfeited/canceled	(43,750	)	41.71			(41,850	)	50.39			(91,526	)		43.45
	Ending Balance	416,250		$	49.53		410,500		$	53.04		412,910			$	49.14

ACCUMULATED_OTHER_COMPREHENSIV1

ACCUMULATED OTHER COMPREHENSIVE INCOME (TABLE)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	A summary of the balances within each classification of accumulated OCI (deficit) as of December 31, 2014 and 2013 (in millions):
		Cash Flow				Defined				OCI			Foreign			Total
		Hedge				Benefit				Valuation			Currency
		Activity				Pension				Allowance			Translation
						Plan				activity			Adjustment
						Activity
	Balance as of December 31, 2012, net of tax	$	(1	)		$	(279	)		$	(114	)	$	30		$	(364	)
	Amounts classified into AOCI, net of tax	$	1			$	15			$	(1	)	$	(28	)	$	(13	)
	Amounts reclassified from AOCI, net of tax					80				—			—			80
	Change in AOCI, net of tax	1				95				(1		)	(28		)	67
	Balance as of December 31, 2013, net of tax	$	—			$	(184	)		$	(115	)	$	2		$	(297	)
	Amounts classified into AOCI, net of tax	$	(5	)		$	(111	)		$	(7	)	$	(136	)	(259		)
	Amounts reclassified from AOCI, net of tax	—				5				—			1			6
	Change in AOCI, net of tax	(5		)		(106		)		(7		)	(135		)	(253		)
	Balance as of December 31, 2014, net of tax	$	(5	)		$	(290	)		$	(122	)	$	(133	)	$	(550	)
Reclassification out of Accumulated Other Comprehensive Income	The following table presents the impact and respective location of AOCI reclassifications on the Consolidated Statements of Earnings (Loss), net of tax (in millions):
				Twelve Months Ended December 31,
		Location		2014				2013
	Foreign Currency Translation Adjustment	Other (income) expenses, net		$	1			$	—
	Defined benefit pension plan activity	Cost of sales		4				61
	Defined benefit pension plan activity	Marketing and administrative		1				19
		expenses
	Total reclassifications from AOCI			$	6			$	80

EARNINGS_PER_SHARE_TABLE

EARNINGS PER SHARE (TABLE)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table summarizes the number of shares outstanding as well as our basic and diluted earnings per share for the years ended December 31, 2014, 2013 and 2012 (in millions, except per share amounts):
		Twelve Months Ended December 31,
		2014		2013		2012
	Net earnings (loss) attributable to Owens Corning	$	226	$	204	$	(19	)
	Weighted-average number of shares outstanding used for basic earnings per share	117.5		118.2		119.4
	Non-vested restricted and performance shares	0.4		0.4		—
	Options to purchase common stock	0.4		0.5		—
	Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share	118.3		119.1		119.4
	Earnings (loss) per common share attributable to Owens Corning common stockholders:
	Basic	$	1.92	$	1.73	$	(0.16	)
	Diluted	$	1.91	$	1.71	$	(0.16	)

FAIR_VALUE_MEASUREMENT_TABLE

FAIR VALUE MEASUREMENT (TABLE)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall, for assets and liabilities measured on a recurring basis as of December 31, 2014 (in millions):
		Total		Quoted Prices		Significant		Significant
		Measured		in Active		Other		Unobservable
		at Fair		Markets for		Observable		Inputs
		Value		Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets:
	Cash equivalents	$	10	$	10	$	—	$	—
	Term deposits	2		2		—		—
	Derivative assets	1		—		1		—
	Total assets	$	13	$	12	$	1	$	—
	Liabilities:
	Derivative liabilities	$	8	$	—	$	8	$	—
	Total liabilities	$	8	$	—	$	8	$	—
	The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall, for assets and liabilities measured on a recurring basis as of December 31, 2013 (in millions):
		Total		Quoted Prices		Significant		Significant
		Measured		in Active		Other		Unobservable
		at Fair		Markets for		Observable		Inputs
		Value		Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets:
	Cash equivalents	$	20	$	20	$	—	$	—
	Term deposits	2		2
	Derivative assets	1		—		1		—
	Total assets	$	23	$	22	$	1	$	—
	Liabilities:
	Derivative liabilities	$	4	$	—	$	4	$	—
	Total liabilities	$	4	$	—	$	4	$	—

INCOME_TAXES_TABLE

INCOME TAXES (TABLE)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	INCOME TAXES
		Twelve Months Ended December 31,
		2014				2013				2012
	Earnings before taxes:
	United States	$	106			$	196			$	31
	Foreign	126				77				(71		)
	Total	$	232			$	273			$	(40	)
	Income tax expense (benefit):
	Current
	United States	$	(2	)		$	(2	)		$	1
	State and local	—				(2		)		(2		)
	Foreign	22				30				20
	Total current	20				26				19
	Deferred
	United States	(6		)		56				(22		)
	State and local	8				2				2
	Foreign	(17		)		(16		)		(27		)
	Total deferred	(15		)		42				(47		)
	Total income tax expense (benefit)	$	5			$	68			$	(28	)
	The reconciliation between the United States federal statutory rate and the Company’s effective income tax rate from continuing operations is:
		Twelve Months Ended December 31,
		2014			2013			2012
	United States federal statutory rate	35	%		35	%		(35	)%
	State and local income taxes, net of federal tax benefit	1			2			(5	)
	Foreign tax rate differential	(15	)		(11	)		(60	)
	US tax expense/benefit on foreign earnings/loss	(5	)		(2	)		(62	)
	Valuation allowance	(1	)		17			127
	Loss on liquidation	—			(10	)		—
	Uncertain tax positions and settlements	(18	)		(1	)		(2	)
	Other, net	5			(5	)		(33	)
	Effective tax rate	2	%		25	%		(70	)%
	As of December 31, 2014, the Company has not recorded a deferred tax liability of approximately $511 million for foreign withholding and United States federal income taxes on approximately $1.4 billion of accumulated undistributed earnings of its foreign subsidiaries and affiliates as they are considered by management to be permanently reinvested.
	The cumulative temporary differences giving rise to the deferred tax assets and liabilities at December 31, 2014 and 2013 are as follows (in millions):
		2014								2013
		Deferred				Deferred				Deferred			Deferred
		Tax				Tax				Tax			Tax
		Assets				Liabilities				Assets			Liabilities
	Other employee benefits	$	155			$	—			$	153		$	—
	Pension plans	159				—				115			—
	Operating loss carryforwards	1,046				—				1,117			—
	Depreciation	—				327				—			338
	Amortization	—				366				—			370
	State and local taxes	4				—				6			—
	Other	113				—				135			—
	Subtotal	1,477				693				1,526			708
	Valuation allowances	(227		)		—				(270		)	—
	Total deferred taxes	$	1,250			$	693			$	1,256		$	708
	The Company had current deferred tax assets of $135 million and $138 million which are included in other current assets in the Consolidated Balance Sheets as of December 31, 2014 and 2013, respectively.
	The following table summarizes the amount and expiration dates of our deferred tax assets related to operating loss and credit carryforwards at December 31, 2014 (in millions):
		Expiration		Amounts
		Dates
	US federal loss carryforwards	2026 – 2032		$	692
	US state loss carryforwards (a)	2014 – 2032		82
	Foreign loss and tax credit carryforwards	Indefinite		104
	Foreign loss and tax credit carryforwards (a)	2014 – 2033		129
	US alternative minimum tax credit	Indefinite		25
	Other US federal and state tax credits	2028 – 2033		14
	Total operating loss and tax credit carryforwards			$	1,046
	(a)	As of December 31, 2014, $14 million US state and $11 million foreign deferred tax assets related to loss carryforwards are set to expire over the next three years.
	At December 31, 2014, the Company had federal, state and foreign net operating loss carryforwards of $2.2 billion, $2.4 billion and $0.9 billion, respectively. In order to fully utilize our operating loss and tax credit carryforwards, the Company will need to generate federal, state, and foreign earnings before taxes of approximately $2.4 billion, $2.6 billion, and $900 million, respectively. Certain of these loss carryforwards are subject to limitation as a result of the changes of control that resulted from the Company’s emergence from bankruptcy in 2006 and the acquisition of certain foreign entities in 2007. However, the Company believes that these limitations on its loss carryforwards will not result in a forfeiture of any of the carryforwards.
	Deferred income taxes are provided for temporary differences between amounts of assets and liabilities for financial reporting purposes and the basis of such assets and liabilities as measured under enacted tax laws and regulations, as well as NOLs, tax credit and other carryforwards. A valuation allowance will be recorded to reduce deferred tax assets if, based on all available evidence, it is considered more likely than not that some portion or all of the recorded deferred tax assets will not be realized in future periods. To the extent the reversal of deferred tax liabilities is relied upon in our assessment of the realizability of deferred tax assets, they will reverse in the same period and jurisdiction as the temporary differences giving rise to the deferred tax assets. As of December 31, 2014, the Company had federal, state, and foreign net deferred tax assets before valuation allowances of $481 million, $61 million, and $242 million, respectively.
	The valuation allowance of $227 million as of December 31, 2014 is related to tax assets of $13 million and $214 million for certain state and foreign jurisdictions, respectively. Realization of deferred tax assets depends on achieving a certain minimum level of future taxable income. Management currently believes that it is at least reasonably possible that the minimum level of taxable income will be met within the next 12 months to reduce the valuation allowance of certain foreign jurisdictions by a range of zero to $14 million. The valuation allowance of $270 million as of December 31, 2013 related to tax assets of $12 million and $258 million for certain state and foreign jurisdictions, respectively.
	The Company, or one of its subsidiaries, files income tax returns in the United States and other foreign jurisdictions. The Company is no longer subject to U.S. federal tax examinations for years before 2011 or state and foreign examinations for years before 2008. Due to the potential for resolution of federal, state and foreign examinations, and the expiration of various statutes of limitation, it is reasonably possible that the gross unrecognized tax benefits balance may change within the next 12 months by a range of zero to $6 million.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
	Twelve Months Ended December 31,
	2014				2013				2012
Balance at beginning of period	$	155			$	161			$	170
Tax positions related to the current year
Gross additions	2				2				12
Tax positions related to prior years
Gross additions	10				4				7
Gross reductions	(57		)		(1		)		(14		)
Settlements	(1		)		(3		)		(13		)
Lapses on statutes of limitations	(3		)		(8		)		(1		)
Balance at end of period	$	106			$	155			$	161
The Company classifies all interest and penalties as income tax expense. As of December 31, 2014, 2013 and 2012, the Company recognized $8 million, $6 million and $10 million respectively, in liabilities for tax related interest and penalties on its Consolidated Balance Sheets and $2 million, $(3) million and $(3) million, respectively, of interest and penalty expense on its Consolidated Statements of Earnings (Loss). If these unrecognized tax benefits were to be recognized as of December 31, 2014, the Company’s income tax expense would decrease by about $78 million.
Schedule of Components of Income Tax Expense (Benefit), By Jurisdiction
	Income tax expense (benefit):
	Current
	United States	$	(2	)		$	(2	)		$	1
	State and local	—				(2		)		(2		)
	Foreign	22				30				20
	Total current	20				26				19
	Deferred
	United States	(6		)		56				(22		)
	State and local	8				2				2
	Foreign	(17		)		(16		)		(27		)
	Total deferred	(15		)		42				(47		)
	Total income tax expense (benefit)	$	5			$	68			$	(28	)
Schedule of Effective Income Tax Rate Reconciliation	The reconciliation between the United States federal statutory rate and the Company’s effective income tax rate from continuing operations is:
		Twelve Months Ended December 31,
		2014			2013			2012
	United States federal statutory rate	35	%		35	%		(35	)%
	State and local income taxes, net of federal tax benefit	1			2			(5	)
	Foreign tax rate differential	(15	)		(11	)		(60	)
	US tax expense/benefit on foreign earnings/loss	(5	)		(2	)		(62	)
	Valuation allowance	(1	)		17			127
	Loss on liquidation	—			(10	)		—
	Uncertain tax positions and settlements	(18	)		(1	)		(2	)
	Other, net	5			(5	)		(33	)
	Effective tax rate	2	%		25	%		(70	)%
Schedule of Deferred Tax Assets and Liabilities	The cumulative temporary differences giving rise to the deferred tax assets and liabilities at December 31, 2014 and 2013 are as follows (in millions):
		2014								2013
		Deferred				Deferred				Deferred			Deferred
		Tax				Tax				Tax			Tax
		Assets				Liabilities				Assets			Liabilities
	Other employee benefits	$	155			$	—			$	153		$	—
	Pension plans	159				—				115			—
	Operating loss carryforwards	1,046				—				1,117			—
	Depreciation	—				327				—			338
	Amortization	—				366				—			370
	State and local taxes	4				—				6			—
	Other	113				—				135			—
	Subtotal	1,477				693				1,526			708
	Valuation allowances	(227		)		—				(270		)	—
	Total deferred taxes	$	1,250			$	693			$	1,256		$	708
Summary of Operating Loss and Tax Credit Carryforwards	The following table summarizes the amount and expiration dates of our deferred tax assets related to operating loss and credit carryforwards at December 31, 2014 (in millions):
		Expiration		Amounts
		Dates
	US federal loss carryforwards	2026 – 2032		$	692
	US state loss carryforwards (a)	2014 – 2032		82
	Foreign loss and tax credit carryforwards	Indefinite		104
	Foreign loss and tax credit carryforwards (a)	2014 – 2033		129
	US alternative minimum tax credit	Indefinite		25
	Other US federal and state tax credits	2028 – 2033		14
	Total operating loss and tax credit carryforwards			$	1,046
	(a)	As of December 31, 2014, $14 million US state and $11 million foreign deferred tax assets related to loss carryforwards are set to expire over the next three years.
Summary of Income Tax Contingencies	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
		Twelve Months Ended December 31,
		2014				2013				2012
	Balance at beginning of period	$	155			$	161			$	170
	Tax positions related to the current year
	Gross additions	2				2				12
	Tax positions related to prior years
	Gross additions	10				4				7
	Gross reductions	(57		)		(1		)		(14		)
	Settlements	(1		)		(3		)		(13		)
	Lapses on statutes of limitations	(3		)		(8		)		(1		)
	Balance at end of period	$	106			$	155			$	161

QUARTERLY_FINANCIAL_INFORMATIO1

QUARTERLY FINANCIAL INFORMATION (unaudited) (TABLE)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Financial Information	Select quarterly financial information is presented in the tables below for the quarterly periods of 2014 and 2013, respectively (in millions, except per share amounts):
		Quarter
		First			Second		Third		Fourth
	2014
	Net sales	$	1,278		$	1,355	$	1,382	$	1,261
	Cost of sales	1,044			1,107		1,131		1,018
	Gross margin	234			248		251		243
	Earnings before interest and taxes	108			73		107		104
	Interest expense, net	27			31		28		28
	Loss on extinguishment of debt	—			—		—		46
	Income tax expense (benefit)	(39		)	21		27		(4		)
	Net earnings attributable to Owens Corning	$	120		$	21	$	52	$	33
	BASIC EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING COMMON STOCKHOLDERS	$	1.02		$	0.18	$	0.44	$	0.28
	DILUTED EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING STOCKHOLDERS	$	1.01		$	0.18	$	0.44	$	0.28
	DIVIDEND PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING STOCKHOLDERS	$	0.16		$	0.16	$	0.16	$	0.16
		Quarter
		First			Second		Third		Fourth
	2013
	Net sales	$	1,350		$	1,347	$	1,320	$	1,278
	Cost of sales	1,137			1,080		1,067		1,045
	Gross margin	213			267		253		233
	Earnings before interest and taxes	57			118		106		104
	Interest expense, net	29			29		29		25
	Income tax expense (benefit)	6			39		26		(3		)
	Net earnings attributable to Owens Corning	$	22		$	49	$	51	$	82
	BASIC EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING COMMON STOCKHOLDERS	$	0.19		$	0.41	$	0.43	$	0.7
	DILUTED EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING STOCKHOLDERS	$	0.18		$	0.41	$	0.43	$	0.69

CONDENSED_CONSOLIDATING_FINANC1

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (TABLE)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Statement of Earnings (Loss)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET SALES	$	—		$	3,646		$	2,005		$	(375	)	$	5,276
	COST OF SALES	(12		)	3,022			1,665			(375		)	4,300
	Gross margin	12			624			340			—			976
	OPERATING EXPENSES
	Marketing and administrative expenses	112			247			128			—			487
	Science and technology expenses	—			58			18			—			76
	Charges related to cost reduction actions	1			5			31			—			37
	Other expenses (income), net	(38		)	17			5			—			(16		)
	Total operating expenses	75			327			182			—			584
	EARNINGS BEFORE INTEREST AND TAXES	(63		)	297			158			—			392
	Interest expense, net	106			3			5			—			114
	Loss on extinguishment of debt	46			—			—			—			46
	EARNINGS (LOSS) BEFORE TAXES	(215		)	294			153			—			232
	Less: Income tax expense (benefit)	(81		)	85			1			—			5
	EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES AND AFFILIATES	(134		)	209			152			—			227
	Equity in net earnings of subsidiaries	360			151			—			(511		)	—
	Equity in net earnings of affiliates	—			—			1			—			1
	NET EARNINGS (LOSS)	226			360			153			(511		)	228
	Less: Net earnings attributable to noncontrolling interests	—			—			2			—			2
	NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	226		$	360		$	151		$	(511	)	$	226
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENT OF EARNINGS (LOSS)
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2013
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET SALES	$	—		$	3,730		$	1,988		$	(423	)	$	5,295
	COST OF SALES	(10		)	3,085			1,677			(423		)	4,329
	Gross margin	10			645			311			—			966
	OPERATING EXPENSES
	Marketing and administrative expenses	123			267			140			—			530
	Science and technology expenses	—			58			19			—			77
	Charges related to cost reduction actions	—			—			8			—			8
	Other expenses (income), net	(27		)	(39		)	32			—			(34		)
	Total operating expenses	96			286			199			—			581
	EARNINGS BEFORE INTEREST AND TAXES	(86		)	359			112			—			385
	Interest expense, net	104			2			6			—			112
	EARNINGS (LOSS) BEFORE TAXES	(190		)	357			106			—			273
	Less: Income tax expense (benefit)	(72		)	121			19			—			68
	EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES AND AFFILIATES	(118		)	236			87			—			205
	Equity in net earnings of subsidiaries	322			86			—			(408		)	—
	Equity in net earnings of affiliates	—			—			—			—			—
	NET EARNINGS (LOSS)	204			322			87			(408		)	205
	Less: Net earnings attributable to noncontrolling interests	—			—			1			—			1
	NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	204		$	322		$	86		$	(408	)	$	204
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2012
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET SALES	$	—		$	3,616		$	1,932		$	(376	)	$	5,172
	COST OF SALES	(9		)	3,015			1,745			(376		)	4,375
	Gross margin	9			601			187			—			797
	OPERATING EXPENSES
	Marketing and administrative expenses	112			259			138			—			509
	Science and technology expenses	—			61			18			—			79
	Charges related to cost reduction actions	—			—			51			—			51
	Other expenses (income)	(37		)	24			23			—			10
	Total operating expenses	75			344			230			—			649
	EARNINGS BEFORE INTEREST AND TAXES	(66		)	257			(43		)	—			148
Interest expense, net	102			2			10			—			114
Loss on extinguishment of debt	74			—			—			—			74
EARNINGS (LOSS) BEFORE TAXES	(242		)	255			(53		)	—			(40		)
Less: Income tax expense (benefit)	(92		)	64			—			—			(28		)
EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES AND AFFILIATES	(150		)	191			(53		)	—			(12		)
Equity in net earnings of subsidiaries	131			(55		)	—			(76		)	—
Equity in net earnings (loss) of affiliates	—			(5		)	1			—			(4		)
NET EARNINGS (LOSS)	(19		)	131			(52		)	(76		)	(16		)
Less: Net earnings attributable to noncontrolling interests	—			—			3			—			3
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	(19	)	$	131		$	(55	)	$	(76	)	$	(19	)
Condensed Consolidating Statement Of Comprehensive Earnings
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET EARNINGS (LOSS)	$	226		$	360		$	153		$	(511	)	$	228
	Currency translation adjustment	(134		)	—			—			—			(134		)
	Pension and other postretirement adjustment (net of tax)	(113		)	—			—			—			(113		)
	Deferred income (loss) on hedging (net of tax)	(6		)	—			—			—			(6		)
	COMPREHENSIVE EARNINGS (LOSS)	(27		)	360			153			(511		)	(25		)
	Less: Comprehensive earnings attributable to noncontrolling interests	—			—			2			—			2
	COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	(27	)	$	360		$	151		$	(511	)	$	(27	)
	OWENS CORNING AND SUBSIDIARIES
	CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS (LOSS)
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2013
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET EARNINGS (LOSS)	$	204		$	322		$	87		$	(408	)	$	205
	Currency translation adjustment	(28		)	—			—			—			(28		)
	Pension and other postretirement adjustment (net of tax)	94			—			—			—			94
	Deferred income (loss) on hedging (net of tax)	1			—			—			—			1
	COMPREHENSIVE EARNINGS (LOSS)	271			322			87			(408		)	272
	Less: Comprehensive earnings attributable to noncontrolling interests	—			—			1			—			1
	COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	271		$	322		$	86		$	(408	)	$	271
	OWENS CORNING AND SUBSIDIARIES
	CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2012
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET EARNINGS (LOSS)	$	(19	)	$	131		$	(52	)	$	(76	)	$	(16	)
	Currency translation adjustment	5			—			—			—			5
	Pension and other postretirement adjustment (net of tax)	(56		)	—			—			—			(56		)
	Deferred income (loss) on hedging (net of tax)	2			—			—			—			2
	COMPREHENSIVE EARNINGS (LOSS)	(68		)	131			(52		)	(76		)	(65		)
	Less: Comprehensive earnings attributable to noncontrolling interests	—			—			3			—			3
	COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	$	(68	)	$	131		$	(55	)	$	(76	)	$	(68	)
Condensed Consolidating Balance Sheet
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	ASSETS
	CURRENT ASSETS
	Cash and cash equivalents	$	—		$	1		$	66		$	—		$	67
	Receivables, net	—			—			674			—			674
	Due from affiliates	—			2,858			—			(2,858		)	—
	Inventories	—			527			290			—			817
	Assets held for sale – current	—			—			16			—			16
	Other current assets	7			132			94			—			233
	Total current assets	7			3,518			1,140			(2,858		)	1,807
	Investment in subsidiaries	7,504			2,590			558			(10,652		)	—
	Due from affiliates	—			—			881			(881		)	—
	Property, plant and equipment, net	359			1,397			1,143			—			2,899
	Goodwill	—			1,127			41			—			1,168
	Intangible assets	—			989			238			(210		)	1,017
	Deferred income taxes	35			380			29			—			444
	Other non-current assets	30			62			128			—			220
	TOTAL ASSETS	$	7,935		$	10,063		$	4,158		$	(14,601	)	$	7,555
	LIABILITIES AND EQUITY
	CURRENT LIABILITIES
	Accounts payable and accrued liabilities	$	47		$	667		$	235		$	—		$	949
	Due to affiliates	1,913			—			945			(2,858		)	—
	Short-term debt	—			25			6			—			31
	Long-term debt – current portion	—			1			2			—			3
	Total current liabilities	1,960			693			1,188			(2,858		)	983
	Long-term debt, net of current portion	1,851			15			125			—			1,991
	Due to affiliates	—			881			—			(881		)	—
	Pension plan liability	310			—			137			—			447
	Other employee benefits liability	—			237			15			—			252
	Deferred income taxes	—			—			22			—			22
	Other liabilities	122			175			43			(210		)	130
	OWENS CORNING
	STOCKHOLDERS’ EQUITY
	Preferred stock	—			—			—			—			—
	Common stock	1			—			—			—			1
	Additional paid in capital	3,954			6,483			1,927			(8,410		)	3,954
	Accumulated earnings	805			1,579			663			(2,242		)	805
	Accumulated other comprehensive deficit	(550		)	—			—			—			(550		)
	Cost of common stock in treasury	(518		)	—			—			—			(518		)
	Total Owens Corning stockholders’ equity	3,692			8,062			2,590			(10,652		)	3,692
	Noncontrolling interests	—			—			38			—			38
	Total equity	3,692			8,062			2,628			(10,652		)	3,730
	TOTAL LIABILITIES AND EQUITY	$	7,935		$	10,063		$	4,158		$	(14,601	)	$	7,555
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF DECEMBER 31, 2013
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	ASSETS
	CURRENT ASSETS
	Cash and cash equivalents	$	—		$	3		$	54		$	—		$	57
	Receivables, net	—			—			683			—			683
	Due from affiliates	—			2,664			—			(2,664		)	—
	Inventories	—			487			323			—			810
	Assets held for sale – current	—			—			29			—			29
	Other current assets	45			140			84			—			269
	Total current assets	45			3,294			1,173			(2,664		)	1,848
	Investment in subsidiaries	7,229			2,558			558			(10,345		)	—
	Due from affiliates	—			67			959			(1,026		)	—
	Property, plant and equipment, net	362			1,313			1,257			—			2,932
	Goodwill	—			1,127			39			—			1,166
Intangible assets	—			1,015			271			(246		)	1,040
Deferred income taxes	14			416			6			—			436
Other non-current assets	31			64			130			—			225
TOTAL ASSETS	$	7,681		$	9,854		$	4,393		$	(14,281	)	$	7,647
LIABILITIES AND EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	15		$	608		$	365		$	—		$	988
Due to affiliates	1,688			—			976			(2,664		)	—
Short-term debt	—			—			1			—			1
Long-term debt – current portion	—			2			1			—			3
Total current liabilities	1,703			610			1,343			(2,664		)	992
Long-term debt, net of current portion	1,814			26			184			—			2,024
Due to affiliates	—			959			67			(1,026		)	—
Pension plan liability	213			—			123			—			336
Other employee benefits liability	—			226			16			—			242
Deferred income taxes	—			—			23			—			23
Other liabilities	158			246			42			(246		)	200
OWENS CORNING
STOCKHOLDERS’ EQUITY
Preferred stock	—			—			—			—			—
Common stock	1			—			—			—			1
Additional paid in capital	3,938			6,572			2,045			(8,617		)	3,938
Accumulated earnings	655			1,215			513			(1,728		)	655
Accumulated other comprehensive deficit	(297		)	—			—			—			(297		)
Cost of common stock in treasury	(504		)	—			—			—			(504		)
Total Owens Corning stockholders’ equity	3,793			7,787			2,558			(10,345		)	3,793
Noncontrolling interests	—			—			37			—			37
Total equity	3,793			7,787			2,595			(10,345		)	3,830
TOTAL LIABILITIES AND EQUITY	$	7,681		$	9,854		$	4,393		$	(14,281	)	$	7,647
Condensed Consolidating Statement of Cash Flows
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES	$	(110	)	$	470		$	81		$	—		$	441
	NET CASH FLOW USED FOR INVESTING ACTIVITIES
	Additions to plant and equipment	(13		)	(219		)	(131		)	—			(363		)
	Derivative settlements	—			—			5			—			5
	Proceeds from the sale of assets or affiliates	44			—			21			—			65
	Investment in subsidiaries and affiliates, net	—			(5		)	(7		)	—			(12		)
	Purchases of alloy	—			—			(28		)	—			(28		)
	Proceeds from the sale of alloy	4			—			43			—			47
	Net cash flow used for investing activities	35			(224		)	(97		)	—			(286		)
	NET CASH FLOW USED FOR FINANCING ACTIVITIES
	Proceeds from senior revolving credit and receivables securitization facilities	1,226			—			50			—			1,276
	Payments on senior revolving credit and receivables securitization facilities	(1,238		)	—			(106		)	—			(1,344		)
	Proceeds from long-term debt	390			—			—			—			390
	Payments on long-term debt	(400		)	—			(2		)	—			(402		)
	Dividends paid	(56		)	—			—			—			(56		)
	Net increase (decrease) in short-term debt	—			25			5			—			30
	Purchases of treasury stock	(44		)	—			—			—			(44		)
	Other	8			—			—			—			8
	Other intercompany loans	189			(273		)	84			—			—
	Net cash flow used for financing activities	75			(248		)	31			—			(142		)
	Effect of exchange rate changes on cash	—			—			(3		)	—			(3		)
	Net increase in cash and cash equivalents	—			(2		)	12			—			10
	Cash and cash equivalents at beginning of period	—			3			54			—			57
	CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	1		$	66		$	—		$	67
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2013
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES	$	(116	)	$	298		$	225		$	—		$	407
	NET CASH FLOW USED FOR INVESTING ACTIVITIES
	Additions to plant and equipment	(10		)	(143		)	(182		)	—			(335		)
	Investment in subsidiaries and affiliates, net	—			(51		)	(11		)	—			(62		)
	Proceeds from Hurricane Sandy insurance claims	—			58			—			—			58
	Deposit related to sale of Hangzhou, China plant	—			—			34			—			34
	Purchases of alloy	—			—			(18		)	—			(18		)
	Proceeds from sale of alloy	16			—			—			—			16
	Net cash flow used for investing activities	6			(136		)	(177		)	—			(307		)
	NET CASH FLOW USED FOR FINANCING ACTIVITIES
	Proceeds from senior revolving credit and receivables securitization facilities	940			—			123			—			1,063
	Payments on senior revolving credit and receivables securitization facilities	(1,002		)	—			(101		)	—			(1,103		)
	Payments on long-term debt	—			—			(2		)	—			(2		)
	Net increase (decrease) in short-term debt	—			—			(4		)	—			(4		)
	Purchases of treasury stock	(63		)	—			—			—			(63		)
	Other	13			—			—			—			13
	Other intercompany loans	222			(162		)	(60		)	—			—
	Net cash flow used for financing activities	110			(162		)	(44		)	—			(96		)
	Effect of exchange rate changes on cash	—			—			(2		)	—			(2		)
	Net increase in cash and cash equivalents	—			—			2			—			2
	Cash and cash equivalents at beginning of period	—			3			52			—			55
	CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	3		$	54		$	—		$	57
	OWENS CORNING AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	FOR THE TWELVE MONTHS ENDED DECEMBER 31, 2012
	(in millions)
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries
	NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES	$	(108	)	$	239		$	199		$	—		$	330
	NET CASH FLOW USED FOR INVESTING ACTIVITIES
	Additions to plant and equipment	(14		)	(174		)	(116		)	—			(304		)
Proceeds from the sale of assets or affiliates	—			5			5			—			10
Proceeds from Hurricane Sandy insurance claims	—			20			—			—			20
Purchases of alloy	(21		)	—			(7		)	—			(28		)
Proceeds from sale of alloy	42			—			7			—			49
Net cash flow used for investing activities	7			(149		)	(111		)	—			(253		)
NET CASH FLOW USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	1,564			—			313			—			1,877
Payments on senior revolving credit and receivables securitization facilities	(1,627		)	—			(330		)	—			(1,957		)
Proceeds from long-term debt	599			—			—			—			599
Payments on long-term debt	(430		)	—			(11		)	—			(441		)
Purchase of noncontrolling interest	—			(22		)	—			—			(22		)
Net increase (decrease) in short-term debt	(8		)	—			(15		)	—			(23		)
Purchases of treasury stock	(113		)	—			—			—			(113		)
Other	4			—			—			—			4
Other intercompany loans	112			(65		)	(47		)	—			—
Net cash flow used for financing activities	101			(87		)	(90		)	—			(76		)
Effect of exchange rate changes on cash	—			—			2			—			2
Net increase in cash and cash equivalents	—			3			—			—			3
Cash and cash equivalents at beginning of period	—			—			52			—			52
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	3		$	52		$	—		$	55

BUSINESS_AND_SUMMARY_OF_SIGNIF3

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (DETAIL) (USD $)

3 Months Ended

12 Months Ended

0 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

Feb. 05, 2015

segment

Property Plant And Equipment [Line Items]

Number of Reportable Segments

3

Dividend (dollars per share)

$0.64

$0

$0

Less: Income tax expense (benefit)

($4)

$27

$21

($39)

($3)

$26

$39

$6

$5

$68

($28)

Cash Flows From Operating Activities

441

407

330

Cash Flows From Financing Activities

142

96

76

Marketing and Advertising Expense

100

105

109

Amortization of Intangible Assets

21

22

21

Precious Metals Depletion Percentage

3.00%

3.00%

Depreciation

283

310

328

Accelerated Depreciation

0

20

0

Restructuring and Related Cost, Accelerated Depreciation

1

9

Foreign Currency Transaction Gain (Loss)

-4

-3

5

Other Noncurrent Assets [Member]

Property Plant And Equipment [Line Items]

Investments in Affiliates

53

51

53

51

Minimum [Member] | Building and Building Improvements [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

15 years

Minimum [Member] | Furnaces [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

4 years

Minimum [Member] | Technology Equipment [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

5 years

Minimum [Member] | Equipment [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

5 years

Maximum [Member] | Building and Building Improvements [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

40 years

Maximum [Member] | Furnaces [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

15 years

Maximum [Member] | Technology Equipment [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

10 years

Maximum [Member] | Equipment [Member]

Property Plant And Equipment [Line Items]

Property, Plant and Equipment Estimated Useful Lives

20 years

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]

Property Plant And Equipment [Line Items]

Impairment of Long-Lived Assets Held for Sale

3

Misclassification Of Non-cash Debt Fair Value Hedge Adjustments [Member]

Property Plant And Equipment [Line Items]

Cash Flows From Operating Activities

11

Cash Flows From Financing Activities

11

Restatement Adjustment [Member]

Property Plant And Equipment [Line Items]

Less: Income tax expense (benefit)

6

Restatement Adjustment [Member] | Misclassification Of Non-cash Debt Fair Value Hedge Adjustments [Member]

Property Plant And Equipment [Line Items]

Cash Flows From Operating Activities

11

Cash Flows From Financing Activities

$11

Subsequent Event [Member]

Property Plant And Equipment [Line Items]

Dividend (dollars per share)

$0.17

SEGMENT_INFORMATION_DETAIL

SEGMENT INFORMATION (DETAIL) (USD $)	3 Months Ended								12 Months Ended
	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		Dec. 31, 2011
									segment
Segment Reporting, Significant Reconciling Item [Line Items]
Number of Reportable Segments									3
Revenues									$5,276,000,000	$5,295,000,000		$5,172,000,000
Charges related to cost reduction actions									-37,000,000	-8,000,000		-51,000,000
Other Costs Related to Restructuring									1,000,000	-18,000,000		-85,000,000
Net gain (loss) related to Hurricane Sandy insurance activity									-6,000,000	15,000,000		-9,000,000
Accelerated depreciation related to a change in the useful life of assets at our incomplete Cordele, Georgia facility									0	-20,000,000		0
General corporate expense									-77,000,000	-108,000,000		-91,000,000
Earnings Before Interest And Taxes	104,000,000	107,000,000	73,000,000	108,000,000	104,000,000	106,000,000	118,000,000	57,000,000	392,000,000	385,000,000		148,000,000
Charges related to cost reduction actions									37,000,000	8,000,000		51,000,000
Total Assets	7,555,000,000				7,647,000,000				7,555,000,000	7,647,000,000
Cash and cash equivalents	67,000,000				57,000,000				67,000,000	57,000,000		55,000,000		52,000,000
Current and noncurrent Deferred income taxes	580,000,000				573,000,000				580,000,000	573,000,000
Investments in affiliates	53,000,000				51,000,000				53,000,000	51,000,000
Assets held for sale – current	16,000,000				29,000,000				16,000,000	29,000,000
Corporate property, plant and equipment, other assets and eliminations	470,000,000				509,000,000				470,000,000	509,000,000
Property, plant and equipment, net	2,899,000,000				2,932,000,000				2,899,000,000	2,932,000,000
Depreciation and amortization									304,000,000	332,000,000		349,000,000
Accelerated depreciation related to cost reduction actions									1,000,000	9,000,000
Additions to plant and equipment									391,000,000	353,000,000		332,000,000
Facility Closing [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Accelerated depreciation related to cost reduction actions									1,000,000
Cost Reduction Action [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Accelerated depreciation related to cost reduction actions										9,000,000
Change in Useful Life [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Accelerated depreciation related to cost reduction actions												55,000,000
Building Materials European Stone [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Net loss on sale of European Stone Business		-20,000,000								0		0
Alcala, Spain Facility [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Impairment loss on Alcala, Spain facility held for sale									-3,000,000	0		0
Hangzhou Facility [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Gain on sale of Hangzhou, China facility				45,000,000						0		0
United States [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									3,557,000,000	3,644,000,000		3,504,000,000
Property, plant and equipment, net	1,773,000,000				1,688,000,000				1,773,000,000	1,688,000,000
Europe [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									575,000,000	545,000,000		558,000,000
Property, plant and equipment, net	404,000,000				520,000,000				404,000,000	520,000,000
Asia Pacific [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									636,000,000	627,000,000		639,000,000
Property, plant and equipment, net	377,000,000				375,000,000				377,000,000	375,000,000
Other Geographical [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									508,000,000	479,000,000		471,000,000
Property, plant and equipment, net	234,000,000				218,000,000				234,000,000	218,000,000
Canada [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Property, plant and equipment, net	111,000,000				131,000,000				111,000,000	131,000,000
Composites [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									1,935,000,000	1,845,000,000		1,859,000,000
Income (Loss) from Operations before Interest and Taxes Attributable to Segments									149,000,000	98,000,000		91,000,000
Total Assets	2,387,000,000				2,417,000,000				2,387,000,000	2,417,000,000
Depreciation and amortization									129,000,000	130,000,000		123,000,000
Additions to plant and equipment									239,000,000	155,000,000		167,000,000
Insulation [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									1,746,000,000	1,642,000,000		1,468,000,000
Income (Loss) from Operations before Interest and Taxes Attributable to Segments									108,000,000	40,000,000		-38,000,000
Total Assets	2,844,000,000				2,858,000,000				2,844,000,000	2,858,000,000
Depreciation and amortization									101,000,000	104,000,000		105,000,000
Additions to plant and equipment									78,000,000	107,000,000		86,000,000
Roofing [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									1,748,000,000	1,967,000,000		2,014,000,000
Income (Loss) from Operations before Interest and Taxes Attributable to Segments									232,000,000	386,000,000		331,000,000
Total Assets	1,138,000,000				1,153,000,000				1,138,000,000	1,153,000,000
Depreciation and amortization									39,000,000	38,000,000		38,000,000
Additions to plant and equipment									41,000,000	60,000,000		41,000,000
Total Segments [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									5,429,000,000	5,454,000,000		5,341,000,000
Income (Loss) from Operations before Interest and Taxes Attributable to Segments									489,000,000	524,000,000		384,000,000
Total Assets	6,369,000,000				6,428,000,000				6,369,000,000	6,428,000,000
Depreciation and amortization									269,000,000	272,000,000		266,000,000
Additions to plant and equipment									358,000,000	322,000,000		294,000,000
Corporate Eliminations [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues									-153,000,000	-159,000,000		-169,000,000
General Corporate [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Depreciation and amortization									35,000,000	60,000,000	[1]	83,000,000	[1]
Additions to plant and equipment									33,000,000	31,000,000		38,000,000
Classification of Assets Relating to Reportable Segments [Member] | Composites [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Total Assets					38,000,000					38,000,000
Classification of Assets Relating to Reportable Segments [Member] | Restatement Adjustment [Member] | General Corporate [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Total Assets					($38,000,000)					($38,000,000)
[1]	2014 includes $1 million of accelerated depreciation related to our decision to close a facility in Japan and optimize a facility in Canada. 2013 includes $9 million of accelerated depreciation related to cost reduction actions and $20 million of accelerated depreciation related to the change in useful life of assets recorded as a result of our assessment of the future utility of an incomplete Insulation facility located in Cordele, Georgia. 2012 includes $55 million of accelerated depreciation charges related to cost reduction actions.

INVENTORIES_DETAIL

INVENTORIES (DETAIL) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]
Finished goods	$568	$580
Materials and supplies	249	230
Total inventories	$817	$810

DERIVATIVE_FINANCIAL_INSTRUMEN2

DERIVATIVE FINANCIAL INSTRUMENTS (BALANCE SHEET) (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Current Assets [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Natural Gas, Electricity, and Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	$0	$1
Other Current Assets [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	1	0
Other Comprehensive Income [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Gain Recognized in OCI, Effective Portion	0	1
Loss Recognized in OCI, Effective Portion	8	0
Accounts Payable and Accrued Liabilities [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Natural Gas, Electricity, and Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	9	0
Accounts Payable and Accrued Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	2	1
Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	($3)	$3

DERIVATIVE_FINANCIAL_INSTRUMEN3

DERIVATIVE FINANCIAL INSTRUMENTS (INCOME STMT) (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cost of Sales [Member] | Designated as Hedging Instrument [Member] | Natural Gas and Electricity Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI Into Income, Effective Portion	$0		$1		$5
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI Into Income, Effective Portion	0		-1		0
Other Expense [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas and Electricity Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Loss Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing	1		0		0
Other Expense [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments, Loss Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing	$1	[1]	$12	[1]	$17	[1]
[1]	(Gains) / losses related to foreign currency derivatives were substantially offset by net revaluation impacts on foreign denominated balance sheet exposures, which were also recorded in Other (income) expenses, net.

DERIVATIVE_FINANCIAL_INSTRUMEN4

DERIVATIVE FINANCIAL INSTRUMENTS NARRATIVE (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Derivative [Line Items]
Derivative Instruments, Loss Recognized in Income	$8
Natural Gas Contract [Member]
Derivative [Line Items]
Derivative, Remaining Maturity	15 months
Two Months [Member] | Natural Gas Contract [Member]
Derivative [Line Items]
Percent Of Exposures Hedged	0.75
Exposure Time	2 months
Four Months [Member] | Natural Gas Contract [Member]
Derivative [Line Items]
Percent Of Exposures Hedged	0.6
Exposure Time	4 months
Current Year [Member] | Electricity Contract [Member]
Derivative [Line Items]
Percent Of Exposures Hedged	0.75
Following Year [Member] | Electricity Contract [Member]
Derivative [Line Items]
Percent Of Exposures Hedged	0.65

GOODWILL_AND_OTHER_INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets [Line Items]
Gross Carrying Amount	$1,190	$1,198
Accumulated Amortization	-173	-158
Net Carrying Amount	1,017	1,040
Goodwill	1,168	1,166
2015	22
2016	22
2017	22
2018	22
2019	22
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Weighted Average Useful Life	25 years
Customer Relationships [Member]
Intangible Assets [Line Items]
Weighted Average Useful Life	19 years	19 years
Gross Carrying Amount	172	181
Accumulated Amortization	-72	-68
Net Carrying Amount	100	113
Technology [Member]
Intangible Assets [Line Items]
Weighted Average Useful Life	20 years	20 years
Gross Carrying Amount	193	194
Accumulated Amortization	-83	-74
Net Carrying Amount	110	120
Franchise Rights and Other Agreements [Member]
Intangible Assets [Line Items]
Weighted Average Useful Life	12 years	14 years
Gross Carrying Amount	39	37
Accumulated Amortization	-18	-16
Net Carrying Amount	21	21
Trademarks [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	786	786
Accumulated Amortization	0	0
Net Carrying Amount	$786	$786

GOODWILL_AND_OTHER_INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS (ROLLFORWARD) (DETAIL) (USD $)	12 Months Ended
	Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	$1,198,000,000
Acquisitions	5,000,000
Additional Franchises and Agreements	1,000,000
Divestitures	-14,000,000
Ending Balance	1,190,000,000
Goodwill [Roll Forward]
Beginning Balance	1,166,000,000
Acquisitions	2,000,000
Ending Balance	1,168,000,000
Composites [Member]
Goodwill [Roll Forward]
Beginning Balance	57,000,000
Acquisitions	0
Ending Balance	57,000,000
Insulation [Member]
Goodwill [Roll Forward]
Beginning Balance	886,000,000
Acquisitions	2,000,000
Ending Balance	888,000,000
Roofing [Member]
Goodwill [Roll Forward]
Beginning Balance	223,000,000
Acquisitions	0
Ending Balance	223,000,000
Customer Relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	181,000,000
Acquisitions	4,000,000
Additional Franchises and Agreements	0
Divestitures	-13,000,000
Ending Balance	172,000,000
Technology-Based Intangible Assets [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	194,000,000
Acquisitions	0
Additional Franchises and Agreements	0
Divestitures	-1,000,000
Ending Balance	193,000,000
Franchise Rights and Other Agreements [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	37,000,000
Acquisitions	1,000,000
Additional Franchises and Agreements	1,000,000
Divestitures	0
Ending Balance	39,000,000
Trademarks [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	786,000,000
Acquisitions	0
Additional Franchises and Agreements	0
Divestitures	0
Ending Balance	$786,000,000

PROPERTY_PLANT_AND_EQUIPMENT_D

PROPERTY, PLANT AND EQUIPMENT (DETAIL) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Property Plant And Equipment [Line Items]
Property, Plant, And Equipment, Gross	$4,623	$4,547
Accumulated depreciation	-1,724	-1,615
Property, plant and equipment, net	2,899	2,932
Precious Metals Percentage	15.00%	17.00%
Precious Metals Depletion Percentage	3.00%
Land [Member]
Property Plant And Equipment [Line Items]
Property, Plant, And Equipment, Gross	196	210
Buildings and Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property, Plant, And Equipment, Gross	789	811
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, Plant, And Equipment, Gross	3,405	3,353
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Property, Plant, And Equipment, Gross	$233	$173

CHANGES_IN_NONCONTROLLING_INTE2

CHANGES IN NONCONTROLLING INTERESTS (DETAIL) (USD $)	3 Months Ended								12 Months Ended
	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
Noncontrolling Interest [Abstract]
Noncontrolling Interest, Payments to Noncontrolling Interests									$22,000,000
Changes in subsidiary shares from noncontrolling interests									6,000,000		22,000,000
Net Income (Loss) Attributable to Parent	33,000,000	52,000,000	21,000,000	120,000,000	82,000,000	51,000,000	49,000,000	22,000,000	226,000,000	204,000,000	-19,000,000
Increase (decrease) in Owens Corning additional paid in capital for NEI purchase agreement									0	0	-16,000,000
Change from net earnings (loss) attributable to Owens Corning and change in noncontrolling interests									$226,000,000	$204,000,000	($35,000,000)

INVESTMENTS_IN_AFFILIATES_DETA

INVESTMENTS IN AFFILIATES (DETAIL) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Schedule Of Equity Method Investments
Current assets	$50,000,000	$50,000,000		$50,000,000
Non-current assets	91,000,000	90,000,000		91,000,000
Current liabilities	36,000,000	25,000,000		36,000,000
Non-current liabilities	11,000,000	23,000,000		11,000,000
Net sales	143,000,000	138,000,000	140,000,000
Gross margin	11,000,000	7,000,000	11,000,000
Net earnings	5,000,000	1,000,000	5,000,000
Dividends from Equity Method Investment	0	0	0
Undistributed Earnings from Equity Method Investees	0			0
Arabian Fiberglass [Member]
Schedule Of Equity Method Investments
Ownership Percentages In Affiliates	49.00%	49.00%		49.00%
Fiberteq LLC [Member]
Schedule Of Equity Method Investments
Ownership Percentages In Affiliates	50.00%	50.00%		50.00%
Neptco LLC [Member]
Schedule Of Equity Method Investments
Ownership Percentages In Affiliates	0.00%	50.00%		0.00%
Proceeds from sale of affiliate				$1,000,000

ACQUISITIONS_DETAIL

ACQUISITIONS (DETAIL) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Sep. 04, 2014	Sep. 04, 2014
Transaco [Member]
Business Acquisition [Line Items]
Total Consideration For Acquisition	$12
Acquisition Cash Payments Costs	7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	4	4
Goodwill	2	2
2014 Acquisition of Transaco [Member] | Other Liabilities [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$5	$5

DIVESTITURES_DETAIL

DIVESTITURES (DETAIL) (USD $)	3 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Sep. 13, 2013
Building Materials European Stone [Member]
Business Divestitures [Line Items]
Proceeds from Divestiture of Businesses	$2
Gain (Loss) on Disposition of Business	-20	0	0
Building Materials European Stone [Member] | Other Operating Income (Expense) [Member]
Business Divestitures [Line Items]
Gain (Loss) on Disposition of Business	20
Masonry Products [Member]
Business Divestitures [Line Items]
Proceeds from Divestiture of Businesses				44
Hangzhou Facility [Member]
Business Divestitures [Line Items]
Amount of Future Consideration Receivable							70
Gain (Loss) on Disposition of Property Plant Equipment		0	0		45
Hangzhou Facility [Member] | Other Current Assets [Member]
Business Divestitures [Line Items]
Proceeds from Divestiture of Businesses						14
Hangzhou Facility [Member] | Other Operating Income (Expense) [Member]
Business Divestitures [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment					$45

ASSETS_HELD_FOR_SALE_DETAIL

ASSETS HELD FOR SALE (DETAIL) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Long Lived Assets Held-for-sale [Line Item]
Assets held for sale – current	$16	$29
Assets Held for Sale Alcala [Member]
Long Lived Assets Held-for-sale [Line Item]
Assets held for sale – current	9
Assets Held for Sale Vado [Member]
Long Lived Assets Held-for-sale [Line Item]
Assets held for sale – current		7
Assets Held For Sale Hangzhou [Member]
Long Lived Assets Held-for-sale [Line Item]
Assets held for sale – current		$21

OPERATING_LEASES_DETAIL

OPERATING LEASES (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OperatingLeasesFutureMinimumPaymentsDueAbstract
Operating Lease Rent Expense	$91	$83	$79
2015	53
2016	44
2017	32
2018	20
2019	14
2020 and beyond	$37

ACCOUNTS_PAYABLE_AND_ACCRUED_L2

ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (DETAILS) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$542	$547
Payroll, vacation pay, and incentive compensation	112	161
Payroll, property, and other taxes	93	95
Other employee benefits liabilities	38	39
Dividends payable	19	0
Warranties (current portion)	17	19
Legal and audit fees	8	7
Accrued interest	9	8
Charges related to cost reduction actions	36	32
Deferred acquisition payments	0	5
Other	75	75
Accounts payable and accrued liabilities	$949	$988

WARRANTIES_DETAIL

WARRANTIES (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Movement In Standard And Extended Product Warranty Increase Decrease [Roll Forward]
Product warranty accrual, beginning balance	$41	$41
Amounts accrued for current year	25	23
Settlements of warranty claims	-26	-23
Product warranty accrual, ending balance	$40	$41

COST_REDUCTION_ACTIONS_DETAIL

COST REDUCTION ACTIONS (DETAIL) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Other Costs Related to Restructuring	($1,000,000)	$18,000,000	$85,000,000
Restructuring Reserve Roll Forward
Costs Incurred	37,000,000	8,000,000	51,000,000
Cost Reductions Actions 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs				9,000,000
Other Costs Related to Restructuring	1,000,000
Restructuring Costs					14,000,000
Restructuring Reserve Roll Forward
Beginning Balance	0				0
Costs Incurred	39,000,000
Payments	3,000,000
Foreign Currency Translation	-2,000,000
Ending Balance	34,000,000			34,000,000
Cumulative Charges Incurred	39,000,000			39,000,000
Cost Reductions Actions 2014 [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	16,000,000				11,000,000
Restructuring Reserve Roll Forward
Beginning Balance	0				0
Costs Incurred	36,000,000
Payments	3,000,000
Foreign Currency Translation	-2,000,000
Ending Balance	31,000,000			31,000,000
Cumulative Charges Incurred	36,000,000			36,000,000
Cost Reductions Actions 2014 [Member] | Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Contract Termination Charges	3,000,000				3,000,000
Restructuring Reserve Roll Forward
Beginning Balance	0				0
Costs Incurred	3,000,000
Payments	0
Foreign Currency Translation	0
Ending Balance	3,000,000			3,000,000
Cumulative Charges Incurred	3,000,000			3,000,000
Cost Reduction Actions 2013 [Member] | Composites [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost		6,000,000
Restructuring Reserve Roll Forward
Beginning Balance	6,000,000				6,000,000
Costs Incurred	-2,000,000
Payments	4,000,000
Foreign Currency Translation	0
Ending Balance	0	6,000,000		0
Cumulative Charges Incurred	4,000,000			4,000,000
Cost Reduction Actions 2013 [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					2,000,000
Cost Reduction Actions 2013 [Member] | Employee Severance [Member] | Composites [Member]
Restructuring Reserve Roll Forward
Beginning Balance	6,000,000				6,000,000
Costs Incurred	-2,000,000
Payments	4,000,000
Foreign Currency Translation	0
Ending Balance	0			0
Cumulative Charges Incurred	4,000,000			4,000,000
Cost Reduction Actions 2012 [Member]
Restructuring Reserve Roll Forward
Beginning Balance	26,000,000				26,000,000
Costs Incurred	0
Payments	23,000,000
Foreign Currency Translation	-1,000,000
Ending Balance	2,000,000			2,000,000
Cumulative Charges Incurred	53,000,000			53,000,000
Cost Reduction Actions 2012 [Member] | Employee Severance [Member]
Restructuring Reserve Roll Forward
Beginning Balance	26,000,000				26,000,000
Costs Incurred	0
Payments	23,000,000
Foreign Currency Translation	-1,000,000
Ending Balance	2,000,000			2,000,000
Cumulative Charges Incurred	$53,000,000			$53,000,000

DEBT_DETAIL

DEBT (DETAIL) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 12, 2014	Jun. 28, 2013	Oct. 17, 2012	Dec. 31, 2011	Oct. 31, 2006	Jun. 03, 2009	Nov. 30, 2013
Long-Term Debt [Line Items]
Long Term Debt	$1,994,000,000	$2,027,000,000
Fair Value Adjustment to Debt	8,000,000	16,000,000
Long Term Debt Current	3,000,000	3,000,000
Long Term Debt Noncurrent	1,991,000,000	2,024,000,000
Repayments of Long-term Debt	402,000,000	2,000,000	441,000,000
Interest Rate Swap Agreement Principal Amount					100,000,000
Short-term Debt [Abstract]
Short-term debt	31,000,000	1,000,000
Short Term Debt, Weighted Average Interest Rate	7.20%	2.20%
Maturities of Long-term Debt [Abstract]
2015	7,000,000
2016	269,000,000
2017	4,000,000
2018	4,000,000
2019	147,000,000
2020 and beyond	1,563,000,000
Senior Notes Due 2016 [Member]
Long-Term Debt [Line Items]
Long Term Debt	158,000,000	400,000,000
Long Term Debt Current				242,000,000		250,000,000
Debt Instrument Face Amount								650,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.50%	6.50%					6.50%
Debt Instrument, Redemption Price, Percentage	111.46%
Interest Expense, Long-term Debt				7,000,000
Senior Notes Due 2019 [Member]
Long-Term Debt [Line Items]
Long Term Debt	143,000,000	248,000,000
Long Term Debt Current				105,000,000		100,000,000
Debt Instrument Face Amount									350,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	9.00%	9.00%
Debt Instrument, Redemption Price, Percentage	122.98%
Repayments of Long-term Debt	52,000,000
Senior Notes Due 2019 [Member] | Gains (Losses) on Extinguishment of Debt [Member]
Long-Term Debt [Line Items]
Interest Expense, Long-term Debt				4,000,000
Unamortized Discount and Fee Amount				2,000,000
Tender Fee Amount				1,000,000
Senior Notes Due 2022 [Member]
Long-Term Debt [Line Items]
Long Term Debt	600,000,000	599,000,000
Debt Instrument Face Amount						600,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.20%	4.20%			4.20%
Senior Notes Due 2024 [Member]
Long-Term Debt [Line Items]
Long Term Debt	392,000,000	0
Debt Instrument Face Amount				400,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.20%	4.20%
Payments of Financing Costs				4,000,000
Senior Notes Due 2036 [Member]
Long-Term Debt [Line Items]
Long Term Debt	540,000,000	540,000,000
Debt Instrument Face Amount								540,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	7.00%	7.00%
Letter of Credit Under Receivables Purchase Agreement [Member]
Long-Term Debt [Line Items]
Long Term Debt	106,000,000	162,000,000
Long Term Debt Current	250,000,000									200,000,000
Line of Credit Facility, Amount Outstanding	38,000,000
Senior Revolving Credit Facility B [Member]
Long-Term Debt [Line Items]
Long Term Debt	0	12,000,000
Line of Credit Facility, Initiation Date	1-Nov-13
Line of Credit Facility, Maximum Borrowing Capacity										800,000,000
Line of Credit Facility, Expiration Date	1-Nov-18
Capital Lease Obligations [Member]
Long-Term Debt [Line Items]
Long Term Debt	47,000,000	49,000,000
Floating Rate Debt [Member]
Long-Term Debt [Line Items]
Long Term Debt	0	1,000,000
Letter of Credit [Member]
Long-Term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity										100,000,000
Line of Credit Facility, Amount Outstanding	$9,000,000

PENSION_PLANS_DETAIL

PENSION PLANS (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Target Plan Asset Allocations, Period	20 years
Defined Benefit Plans, Accumulated Other Comprehensive Income (Loss), After Tax [Abstract]
Defined Benefit Plan, Target Plan Asset Allocations Range Amount	25.00%
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Period	$1,070	$1,187
Defined Benefit Plan, Service Cost	8	9
Defined Benefit Plan, Interest Cost	48	44
Defined Benefit Plan, Actuarial (Gain) Loss	159	-91
Defined Benefit Plan, Currency (Gain) Loss	0	0
Defined Benefit Plan, Benefits Paid	-92	-79
Defined Benefit Plan, Settlements / Curtailments	0	0
Defined Benefit Plan, Other	0	0
Benefit Obligation at End of Period	1,193	1,070	1,187
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Period	858	856
Defined Benefit Plan, Actual Return on Plan Assets	82	60
Defined Benefit Plan, Currency Gain (Loss)	0	0
Defined Benefit Plan, Company Contributions	36	20
Defined Benefit Plan, Benefits Paid	-92	-79
Defined Benefit Plan, Settlements/Curtailments	0	0
Defined Benefit Plan, Other	-1	1
Fair Value of Assets at End of Period	883	858	856
Defined Benefit Plan, Funded Status of Plan	-310	-212
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Prepaid Pension Cost	0	0
Defined Benefit Plan, Accrued Pension Cost - Current	-1	0
Defined Benefit Plan, Accrued Pension Cost - Noncurrent	-309	-212
Defined Benefit Plan, Net Amount Recognized	-310	-212
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax [Abstract]
Defined Benefit, Net Actuarial Loss	-415	-289
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Projected Benefit Obligation	1,193	1,070
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Accumulated Benefit Obligation	1,193	1,070
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Fair Value of Plan Assets	883	858
Defined Benefit Plan, Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Projected Benefit Obligation	0	0
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Accumulated Benefit Obligation	0	0
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Fair Value of Plan Assets	0	0
Defined Benefit Plan, Accumulated Benefit Obligation	1,193	1,070
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.85%	4.65%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Return on Assets	7.00%	7.00%
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	8	9
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.65%	3.80%	4.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Return on Assets	7.00%	7.50%	7.25%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Percentage of Assets Invested in Equity	38.00%
Percentage of Assets Invested in Real Estate	3.00%
Percentage of Assets Invested in Real Assets	6.00%
Percentage of Assets Invested in Intermediate and Long-term Fixed income Securities	47.00%
Percentage of Assets Invested in Absolute Return Securities	6.00%
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Estimated Future Employer Contributions in Next Fiscal Year	48
United States Pension Plans of US Entity, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	537	515
United States Pension Plans of US Entity, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	346	343
United States Pension Plans of US Entity, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Actively Managed [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	138	138
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Actively Managed [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	99	100
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Actively Managed [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	39	38
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Actively Managed [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Passive Index [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	61	58
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Passive Index [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Passive Index [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	61	58
United States Pension Plans of US Entity, Defined Benefit [Member] | Domestic Passive Index [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | International Actively Managed [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	115	121
United States Pension Plans of US Entity, Defined Benefit [Member] | International Actively Managed [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	81	85
United States Pension Plans of US Entity, Defined Benefit [Member] | International Actively Managed [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	34	36
United States Pension Plans of US Entity, Defined Benefit [Member] | International Actively Managed [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | International Passive Index [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	26	25
United States Pension Plans of US Entity, Defined Benefit [Member] | International Passive Index [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | International Passive Index [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	26	25
United States Pension Plans of US Entity, Defined Benefit [Member] | International Passive Index [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	2
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	2
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Short-term Debt [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	26	27
United States Pension Plans of US Entity, Defined Benefit [Member] | Short-term Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Short-term Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	26	27
United States Pension Plans of US Entity, Defined Benefit [Member] | Short-term Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate bonds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	284	267
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	229	213
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	55	54
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Government Debt [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	98	91
United States Pension Plans of US Entity, Defined Benefit [Member] | Government Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	98	91
United States Pension Plans of US Entity, Defined Benefit [Member] | Government Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Government Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Investment Trusts [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	28	26
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Investment Trusts [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	28	26
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Investment Trusts [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Estate Investment Trusts [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Absolute Return Strategies [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	55	80
United States Pension Plans of US Entity, Defined Benefit [Member] | Absolute Return Strategies [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Absolute Return Strategies [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	55	80
United States Pension Plans of US Entity, Defined Benefit [Member] | Absolute Return Strategies [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	50	25
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	50	25
United States Pension Plans of US Entity, Defined Benefit [Member] | Real Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Period	546	554
Defined Benefit Plan, Service Cost	5	6
Defined Benefit Plan, Interest Cost	23	21
Defined Benefit Plan, Actuarial (Gain) Loss	63	3
Defined Benefit Plan, Currency (Gain) Loss	-44	-8
Defined Benefit Plan, Benefits Paid	-23	-21
Defined Benefit Plan, Settlements / Curtailments	-2	-7
Defined Benefit Plan, Other	-4	-2
Benefit Obligation at End of Period	564	546	554
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Period	422	404
Defined Benefit Plan, Actual Return on Plan Assets	50	35
Defined Benefit Plan, Currency Gain (Loss)	-35	-9
Defined Benefit Plan, Company Contributions	16	20
Defined Benefit Plan, Benefits Paid	-23	-21
Defined Benefit Plan, Settlements/Curtailments	-2	-7
Defined Benefit Plan, Other	2	0
Fair Value of Assets at End of Period	430	422	404
Defined Benefit Plan, Funded Status of Plan	-134	-124
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Prepaid Pension Cost	5	2
Defined Benefit Plan, Accrued Pension Cost - Current	-1	-2
Defined Benefit Plan, Accrued Pension Cost - Noncurrent	-138	-124
Defined Benefit Plan, Net Amount Recognized	-134	-124
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax [Abstract]
Defined Benefit, Net Actuarial Loss	-107	-78
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Projected Benefit Obligation	457	414
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Accumulated Benefit Obligation	441	400
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Fair Value of Plan Assets	321	293
Defined Benefit Plan, Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Projected Benefit Obligation	107	132
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Accumulated Benefit Obligation	99	121
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Fair Value of Plan Assets	109	129
Defined Benefit Plan, Accumulated Benefit Obligation	540	521
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.60%	4.45%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Return on Assets	6.27%	6.38%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.01%	3.94%
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	5	6
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.45%	4.10%	4.65%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Return on Assets	6.38%	6.13%	7.23%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.94%	3.50%	3.75%
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Estimated Future Employer Contributions in Next Fiscal Year	14
Foreign Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	3
Foreign Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	430	419
Foreign Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Domestic Actively Managed [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	30	34
Foreign Pension Plans, Defined Benefit [Member] | Domestic Actively Managed [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Domestic Actively Managed [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	30	34
Foreign Pension Plans, Defined Benefit [Member] | Domestic Actively Managed [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Domestic Passive Index [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	4
Foreign Pension Plans, Defined Benefit [Member] | Domestic Passive Index [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Domestic Passive Index [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	4
Foreign Pension Plans, Defined Benefit [Member] | Domestic Passive Index [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | International Actively Managed [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	51	61
Foreign Pension Plans, Defined Benefit [Member] | International Actively Managed [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | International Actively Managed [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	51	61
Foreign Pension Plans, Defined Benefit [Member] | International Actively Managed [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | International Passive Index [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	35	28
Foreign Pension Plans, Defined Benefit [Member] | International Passive Index [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | International Passive Index [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	35	28
Foreign Pension Plans, Defined Benefit [Member] | International Passive Index [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Cash [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	28	25
Foreign Pension Plans, Defined Benefit [Member] | Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	3
Foreign Pension Plans, Defined Benefit [Member] | Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	28	22
Foreign Pension Plans, Defined Benefit [Member] | Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Corporate bonds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	193	162
Foreign Pension Plans, Defined Benefit [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	193	162
Foreign Pension Plans, Defined Benefit [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Government Debt [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	7
Foreign Pension Plans, Defined Benefit [Member] | Government Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Government Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	7
Foreign Pension Plans, Defined Benefit [Member] | Government Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Absolute Return Strategies [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	93	101
Foreign Pension Plans, Defined Benefit [Member] | Absolute Return Strategies [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Foreign Pension Plans, Defined Benefit [Member] | Absolute Return Strategies [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	93	101
Foreign Pension Plans, Defined Benefit [Member] | Absolute Return Strategies [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Period	0	0
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Period	1,616	1,741
Defined Benefit Plan, Service Cost	13	15	15
Defined Benefit Plan, Interest Cost	71	65	72
Defined Benefit Plan, Actuarial (Gain) Loss	222	-88
Defined Benefit Plan, Currency (Gain) Loss	-44	-8
Defined Benefit Plan, Benefits Paid	-115	-100
Defined Benefit Plan, Settlements / Curtailments	-2	-7
Defined Benefit Plan, Other	-4	-2
Benefit Obligation at End of Period	1,757	1,616	1,741
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Period	1,280	1,260
Defined Benefit Plan, Actual Return on Plan Assets	132	95
Defined Benefit Plan, Currency Gain (Loss)	-35	-9
Defined Benefit Plan, Company Contributions	52	40
Defined Benefit Plan, Benefits Paid	-115	-100
Defined Benefit Plan, Settlements/Curtailments	-2	-7
Defined Benefit Plan, Other	1	1
Fair Value of Assets at End of Period	1,313	1,280	1,260
Defined Benefit Plan, Funded Status of Plan	-444	-336
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Prepaid Pension Cost	5	2
Defined Benefit Plan, Accrued Pension Cost - Current	-2	-2
Defined Benefit Plan, Accrued Pension Cost - Noncurrent	-447	-336
Defined Benefit Plan, Net Amount Recognized	-444	-336
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax [Abstract]
Defined Benefit, Net Actuarial Loss	-522	-367
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Projected Benefit Obligation	1,650	1,484
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Accumulated Benefit Obligation	1,634	1,470
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Fair Value of Plan Assets	1,204	1,151
Defined Benefit Plan, Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Projected Benefit Obligation	107	132
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Accumulated Benefit Obligation	99	121
Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations, Fair Value of Plan Assets	109	129
Defined Benefit Plan, Accumulated Benefit Obligation	1,733	1,591
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	13	15	15
Defined Benefit Plan, Expected Return on Plan Assets	-84	-84	-86
Defined Benefit Plan, Amortization of (Gains) Losses	11	20	29
Defined Benefit Plan, Net Periodic Benefit Cost	11	16	30
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2015	106
2016	102
2017	103
2018	101
2019	103
2020-2023	509
Pension Plans, Defined Benefit [Member] | Other Comprehensive Income [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Interest Cost	19	81
Defined Benefit Plans, Accumulated Other Comprehensive Income (Loss), After Tax [Abstract]
Amounts Recognized in Other Comprehensive Income (Loss), after Tax	94
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax	-522
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Contribution Plan Disclosure [Line Items]
Company Match Regardless of Employee Contribution	2.00%
Cost Recognized Related to Defined Benefit Plans	$34	$29	$30

POSTEMPLOYMENT_AND_POSTRETIREM2

POSTEMPLOYMENT AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Employee Eligible Age	10 years
Defined Benefit Plan, Qualifying Employee Age, Scenario 1	45 years
Defined Benefit Plan, Qualifying Employee Age, Scenario 2	48 years
Defined Benefit Plan, Qualifying Employee Age, Scenario 3	50 years
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Period	$228	$252
Defined Benefit Plan, Service Cost	2	2
Defined Benefit Plan, Interest Cost	9	8
Defined Benefit Plan, Actuarial Loss (Gain)	17	-18
Defined Benefit Plan, Currency Loss (Gain)	0	0
Defined Benefit Plan, Plan Amendments	0	0
Defined Benefit Plan, Benefits Paid	-18	-18
Defined Benefit Plan, Other	0	2
Benefit Obligation at End of Period	238	228	252
Defined Benefit Plan, Funded Status of Plan	-238	-228
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Accrued Benefit Obligation - Current	-18	-20
Pension and Other Postretirement Defined Benefit Plans, Accrued Benefit Obligation - Noncurrent	-220	-208
Defined Benefit Plan, Net Amount Recognized	-238	-228
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax [Abstract]
Defined Benefit Plan, Net Actuarial Gain	-20	21
Defined Benefit Plan, Net Prior Service Credit	-2	24
Defined Benefit Plan, Net Amount Recognized	-22	45
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.70%	4.35%
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	2	2
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.35%	3.50%	4.35%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Health Care Cost Trend Initial Rate at End of Year	7.00%	7.00%	7.00%
Defined Benefit Plan, Health Care Cost Trend Ultimate Rate	5.00%	5.00%	5.00%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2024	2023	2022
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Period	16	21
Defined Benefit Plan, Service Cost	0	1
Defined Benefit Plan, Interest Cost	1	1
Defined Benefit Plan, Actuarial Loss (Gain)	0	-2
Defined Benefit Plan, Currency Loss (Gain)	-1	0
Defined Benefit Plan, Plan Amendments	0	0
Defined Benefit Plan, Benefits Paid	-1	-2
Defined Benefit Plan, Other	1	-3
Benefit Obligation at End of Period	16	16	21
Defined Benefit Plan, Funded Status of Plan	-16	-16
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Accrued Benefit Obligation - Current	-1	0
Pension and Other Postretirement Defined Benefit Plans, Accrued Benefit Obligation - Noncurrent	-15	-16
Defined Benefit Plan, Net Amount Recognized	-16	-16
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax [Abstract]
Defined Benefit Plan, Net Actuarial Gain	0	6
Defined Benefit Plan, Net Prior Service Credit	-5	0
Defined Benefit Plan, Net Amount Recognized	-5	6
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.70%	4.45%
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	0	1
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.45%	3.80%	4.10%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Health Care Cost Trend Initial Rate at End of Year	5.43%	6.23%	6.50%
Defined Benefit Plan, Health Care Cost Trend Ultimate Rate	4.70%	4.79%	4.80%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2019	2019	2019
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Period	244	273
Defined Benefit Plan, Service Cost	2	3	3
Defined Benefit Plan, Interest Cost	10	9	11
Defined Benefit Plan, Actuarial Loss (Gain)	17	-20
Defined Benefit Plan, Currency Loss (Gain)	-1	0
Defined Benefit Plan, Plan Amendments	0	0
Defined Benefit Plan, Benefits Paid	-19	-20
Defined Benefit Plan, Other	1	-1
Benefit Obligation at End of Period	254	244	273
Defined Benefit Plan, Funded Status of Plan	-254	-244
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Accrued Benefit Obligation - Current	-19	-20
Pension and Other Postretirement Defined Benefit Plans, Accrued Benefit Obligation - Noncurrent	-235	-224
Defined Benefit Plan, Net Amount Recognized	-254	-244
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax [Abstract]
Defined Benefit Plan, Net Actuarial Gain	-20	27
Defined Benefit Plan, Net Prior Service Credit	-7	24
Defined Benefit Plan, Net Amount Recognized	-27	51
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	2	3	3
Defined Benefit Plan, Amortization of Prior Service Cost	-4	-4	-4
Defined Benefit Plan, Amortization of (Gains) Losses	-2	-1	-3
Defined Benefit Plan, Curtailments	0	0	-1
Defined Benefit Plan, Net Periodic Benefit Cost	6	7	6
Defined Benefit Plan, Effect of One Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	1
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	0
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	10
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	-8
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2015	19
2016	20
2017	20
2018	19
2019	19
2020-2024	88
Postemployment Benefits [Abstract]
Postemployment Benefits Liability	17	18
Postemployment Benefits, Period Expense	1	1	1
Other Postretirement Benefit Plans, Defined Benefit [Member] | Other Comprehensive Income [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Interest Cost	4
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Amounts Recognized in Other Comprehensive Income (Loss), after Tax	-13	7
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax	$27

CONTINGENT_LIABILITIES_AND_OTH1

CONTINGENT LIABILITIES AND OTHER MATTERS (DETAIL) (USD $)	12 Months Ended	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
	site
Unusual or Infrequent Item [Line Items]
Environmental Liability Sites	21
Environmental Liabilities Reserve	$3
Hurricane Sandy [Member]
Unusual or Infrequent Item [Line Items]
Proceeds from Insurance Settlement, Operating Activities		78
Hurricane Sandy [Member] | Cost of Sales [Member]
Unusual or Infrequent Item [Line Items]
Unusual or Infrequent Item, Anticipated Charges	1
Loss from Catastrophes Reported in Cost of Sales			27	6
Hurricane Sandy [Member] | Other Income [Member]
Unusual or Infrequent Item [Line Items]
Unusual or Infrequent Item, Anticipated Charges	5
Loss from Catastrophes Reported in Other (Income) Expenses			16	23
Proceeds from Insurance Premiums Collected			$58	$20

STOCK_COMPENSATION_DETAIL

STOCK COMPENSATION (DETAIL) (USD $)	12 Months Ended			0 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 09, 2015	Apr. 18, 2013
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward
Options, Outstanding, Number, Beginning Balance	2,748,720	3,025,220	3,293,545
Options, Outstanding, Number, Grants In Period	374,500	329,800	409,700
Options, Outstanding, Number, Options Exercised	-328,875	-549,800	-520,120
Options, Outstanding, Number, Forfeitures In Period	-35,400	-56,500	-157,905
Options, Outstanding, Number, Expirations In Period	-4,050	0	0
Options, Outstanding, Number, Ending Balance	2,754,895	2,748,720	3,025,220
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options, Outstanding, Weighted Average Exercise Price, Beginning of Period	$29.55	$27.78	$26.26
Options, Outstanding, Grants In Period Weighted Average Exercise Price	$37.65	$42.16	$33.73
Options, Outstanding, Exercises In Period Weighted Average Exercise Price	$25.23	$26.88	$22.65
Options, Outstanding, Forfeitures In Period Weighted Average Exercise Price	$38.09	$34.58	$28.48
Options, Outstanding, Expirations In Period Weighted Average Exercise Price	$34.50	$0	$0
Options, Outstanding, Weighted Average Exercise Price, End of Period	$31.04	$29.55	$27.78
Minimum [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercisable Options, Weighted Average Exercise Price	$13.89
Maximum [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercisable Options, Weighted Average Exercise Price	$42.16
Exercise Price Range One [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of Outstanding Options	2,754,895
Outstanding Options, Weighted Average Remaining Contractual Term	4 years 11 months 27 days
Outstanding Options, Weighted Average Exercise Price	$31.04
Number of Exercisable Options	1,934,695
Exercisable Options, Weighted Average Remaining Contractual Term	3 years 8 months 19 days
Exercisable Options, Weighted Average Exercise Price	$28.18
Stock Plan 2013 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares Available for Grant	2,400,000				1,500,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Maximum Term	10 years
Fair Value Assumptions, Expected Volatility Rate	50.90%	45.30%	45.80%
Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Fair Value Assumptions, Expected Term	6 years 3 months	6 years 3 months 4 days	6 years 3 months 4 days
Fair Value Assumptions, Risk Free Interest Rate	1.90%	1.10%	1.10%
Allocated Share-based Compensation Expense	$6	$5	$5
Unrecognized Compensation Cost Related to Stock Options	9
Weighted Average Period For Recognition of Compensation Cost	2 years 6 months 20 days
Intrinsic Value of Options Outstanding	16	31	28
Intrinsic Value of Options Exercisable	15	27	28
Cash Received from Exercise of Stock Options	8	15	12
Tax Benefit Realized from Exercise of Stock Options	2	3	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonoptions, Number, Grants In Period	374,500	329,800	409,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonoptions, Weighted Average Fair Value, Grants in Period	$19.05	$18.94	$15.85
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated Share-based Compensation Expense	17	16	15
Weighted Average Period For Recognition of Compensation Cost	2 years 6 months 12 days
Award Vesting Period	4 years
Total Unrecognized Compensation Cost Related to Restricted Stock	24
Grants in Period Fair Value	15	16	12
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonoptions, Number, Beginning Balance	1,735,824	1,875,065	1,941,742
Nonoptions, Number, Grants In Period	522,994	512,398	638,618
Nonoptions, Number, Vested In Period	-459,359	-573,920	-544,528
Nonoptions, Number, Forfeited In Period	-71,718	-77,719	-160,767
Nonoptions, Number, Ending Balance	1,727,741	1,735,824	1,875,065
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonoptions, Weighted Average Fair Value, Beginning Balance	$32.49	$27.14	$23.83
Nonoptions, Weighted Average Fair Value, Grants in Period	$36.72	$41.01	$33.43
Nonoptions, Weighted Average Fair Value, Vested	$32.49	$26	$22.38
Nonoptions, Weighted Average Fair Value, Forfeited	$37.17	$34.62	$28.36
Nonoptions, Weighted Average Fair Value, Ending Balance	$33.58	$32.49	$27.14
Performance Stock Units (PSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated Share-based Compensation Expense	6	7	13
Weighted Average Period For Recognition of Compensation Cost	1 year 8 months 12 days
Award Vesting Period	3 years
Total Unrecognized Compensation Cost Related to Restricted Stock	10
Grants in Period Fair Value	1	9	11
Performance Stock Paid In Stock	0.5
Performance Stock Paid In Cash	0.5
Performance Stock Payout Minimum	0
Performance Stock Payout Range Maximum	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonoptions, Number, Beginning Balance	410,500	412,910	508,616
Nonoptions, Number, Grants In Period	248,950	207,050	256,400
Nonoptions, Number, Vested In Period	-199,450	-167,610	-260,580
Nonoptions, Number, Forfeited In Period	-43,750	-41,850	-91,526
Nonoptions, Number, Ending Balance	416,250	410,500	412,910
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonoptions, Weighted Average Fair Value, Beginning Balance	$53.04	$49.14	$42.24
Nonoptions, Weighted Average Fair Value, Grants in Period	$44.43	$56.71	$47.97
Nonoptions, Weighted Average Fair Value, Vested	$52.11	$48.61	$36.52
Nonoptions, Weighted Average Fair Value, Forfeited	$41.71	$50.39	$43.45
Nonoptions, Weighted Average Fair Value, Ending Balance	$49.53	$53.04	$49.14
Performance Stock Units (PSUs) Stock 2014 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair Value Assumptions, Expected Volatility Rate	36.00%
Fair Value Assumptions, Expected Term	2 years 10 months 24 days
Fair Value Assumptions, Risk Free Interest Rate	0.68%
Employee Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares Available for Grant					2,000,000
Total Unrecognized Compensation Cost Related to Restricted Stock	1
Purchase Price, Percentage of Market Value					85.00%
Employee Emergence Equity Program Expense	2	1
Shares Purchased by Employees	200,000	100,000
Average Price of Shares Purchased	$34.10	$33.29
Employee Stock [Member] | Subsequent Event [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Value of Shares Purchased by Employees				$1
Performance Stock Units (PSUs) Stock 2013 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair Value Assumptions, Expected Volatility Rate		36.70%
Fair Value Assumptions, Expected Term		2 years 10 months 24 days
Fair Value Assumptions, Risk Free Interest Rate		0.40%
Performance Stock Units (PSUs) Stock 2012 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair Value Assumptions, Expected Volatility Rate			48.20%
Fair Value Assumptions, Expected Term			2 years 10 months 28 days
Fair Value Assumptions, Risk Free Interest Rate			0.30%

ACCUMULATED_OTHER_COMPREHENSIV2

ACCUMULATED OTHER COMPREHENSIVE INCOME (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Deficit, Beginning Balance	($297)	($364)
Amounts classified into AOCI, net of tax	-259	-13
Amounts reclassified from AOCI, net of tax	6	80
Change in AOCI, net of tax	-253	67
Accumulated Other Comprehensive Deficit, Ending Balance	-550	-297
Type of Expense From AOCI to the Statement of Earnings [Line Items]
Expense on the Statement of Earnings	6	80
Foreign Currency Translation Adjustment [Member] | Other (Income) Expenses, Net [Member]
Type of Expense From AOCI to the Statement of Earnings [Line Items]
Expense on the Statement of Earnings	1	0
Pension Plan [Member] | Cost of Sales [Member]
Type of Expense From AOCI to the Statement of Earnings [Line Items]
Expense on the Statement of Earnings	4	61
Pension Plan [Member] | General and Administrative Expense [Member]
Type of Expense From AOCI to the Statement of Earnings [Line Items]
Expense on the Statement of Earnings	1	19
Cash Flow Hedge Activity [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Deficit, Beginning Balance	0	-1
Amounts classified into AOCI, net of tax	-5	1
Amounts reclassified from AOCI, net of tax	0
Change in AOCI, net of tax	-5	1
Accumulated Other Comprehensive Deficit, Ending Balance	-5	0
Defined Benefit Pension Plans Activity [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Deficit, Beginning Balance	-184	-279
Amounts classified into AOCI, net of tax	-111	15
Amounts reclassified from AOCI, net of tax	5	80
Change in AOCI, net of tax	-106	95
Accumulated Other Comprehensive Deficit, Ending Balance	-290	-184
OCI Valuation Allowance activity [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Deficit, Beginning Balance	-115	-114
Amounts classified into AOCI, net of tax	-7	-1
Amounts reclassified from AOCI, net of tax	0	0
Change in AOCI, net of tax	-7	-1
Accumulated Other Comprehensive Deficit, Ending Balance	-122	-115
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Deficit, Beginning Balance	2	30
Amounts classified into AOCI, net of tax	-136	-28
Amounts reclassified from AOCI, net of tax	1	0
Change in AOCI, net of tax	-135	-28
Accumulated Other Comprehensive Deficit, Ending Balance	($133)	$2

WARRANTS_DETAIL

WARRANTS (DETAIL) (USD $)	Dec. 31, 2014
In Millions, except Per Share data, unless otherwise specified
Series A [Member]
ClassOfWarrantOrRightLineItems
Class of Warrant or Right, Outstanding	17.5
Class of Warrant or Right, Exercise Price of Warrants or Rights	$43
Series B [Member]
ClassOfWarrantOrRightLineItems
Class of Warrant or Right, Outstanding	7.8
Class of Warrant or Right, Exercise Price of Warrants or Rights	$45.25

EARNINGS_PER_SHARE_DETAIL

EARNINGS PER SHARE (DETAIL) (USD $)	3 Months Ended								12 Months Ended
In Millions, except 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	Apr. 19, 2012
Earnings Per Share [Abstract]
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	$33	$52	$21	$120	$82	$51	$49	$22	$226	$204	($19)
Weighted-average number of shares outstanding used for basic earnings per share									117,500,000	118,200,000	119,400,000
Non-vested restricted and performance shares									400,000	400,000	0
Options to purchase common stock									400,000	500,000	0
Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share									118,300,000	119,100,000	119,400,000
Basic (dollars per share)	$0.28	$0.44	$0.18	$1.02	$0.70	$0.43	$0.41	$0.19	$1.92	$1.73	($0.16)
Diluted (dollars per share)	$0.28	$0.44	$0.18	$1.01	$0.69	$0.43	$0.41	$0.18	$1.91	$1.71	($0.16)
Repurchase Program 2012 [Member]
Equity Class Of Treasury Stock [Line Items]
Number of Shares Authorized to be Repurchased												10,000,000
Remaining Number of Shares Authorized to be Repurchased	7,700,000								7,700,000
Combined Repurchase Programs [Member]
Equity Class Of Treasury Stock [Line Items]
Number of Shares Acquired During Period									900,000
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount									1,000,000	600,000	600,000
Performance Shares [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount											200,000
Restricted Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount											500,000
Series A Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount											17,500,000
Series B Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount											7,800,000

FAIR_VALUE_MEASUREMENT_DETAIL

FAIR VALUE MEASUREMENT (DETAIL) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Jun. 28, 2013	Sep. 04, 2014
Assets
Cash equivalents	$10,000,000	$20,000,000
Term deposits	2,000,000	2,000,000
Derivative assets	1,000,000	1,000,000
Total assets	13,000,000	23,000,000
Liabilities
Derivative liabilities	8,000,000	4,000,000
Total liabilities	8,000,000	4,000,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt Fair Value	153,000,000	268,000,000
Senior Notes Due 2016 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage Bearing Fixed Interest Percentage Rate	6.50%	6.50%	6.50%
Notes Payable Par Value	109.00%	112.00%
Senior Notes Due 2036 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage Bearing Fixed Interest Percentage Rate	7.00%	7.00%
Notes Payable Par Value	124.00%	109.00%
Senior Notes Due 2019 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage Bearing Fixed Interest Percentage Rate	9.00%	9.00%
Notes Payable Par Value	119.00%	127.00%
Senior Notes Due 2022 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage Bearing Fixed Interest Percentage Rate	4.20%	4.20%		4.20%
Notes Payable Par Value	101.00%	102.00%
Senior Notes Due 2024 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage Bearing Fixed Interest Percentage Rate	4.20%	4.20%
Notes Payable Par Value	99.00%
2014 Acquisition of Transaco [Member]
Liabilities
Contingent Consideration Cap	7,000,000
Contingent Consideration Floor	4,000,000
2014 Acquisition of Transaco [Member] | Other Liabilities [Member]
Liabilities
Contingent Consideration Fair Value					5,000,000
Fair Value, Inputs, Level 1 [Member]
Assets
Cash equivalents	10,000,000	20,000,000
Term deposits	2,000,000	2,000,000
Derivative assets	0	0
Total assets	12,000,000	22,000,000
Liabilities
Derivative liabilities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Assets
Cash equivalents	0	0
Term deposits	0
Derivative assets	1,000,000	1,000,000
Total assets	1,000,000	1,000,000
Liabilities
Derivative liabilities	8,000,000	4,000,000
Total liabilities	8,000,000	4,000,000
Fair Value, Inputs, Level 3 [Member]
Assets
Cash equivalents	0	0
Term deposits	0
Derivative assets	0	0
Total assets	0	0
Liabilities
Derivative liabilities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities
Property, Plant, Equipment Net Book Value	11,000,000
Impairment of Long-Lived Assets Held for Sale	$3,000,000

INCOME_TAXES_DETAIL

INCOME TAXES (DETAIL) (USD $)	3 Months Ended									12 Months Ended
	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	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Earnings Before Taxes, Domestic										$106,000,000		$196,000,000	$31,000,000
Earnings Before Taxes, Foreign										126,000,000		77,000,000	-71,000,000
EARNINGS (LOSS) BEFORE TAXES										232,000,000		273,000,000	-40,000,000
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)										-2,000,000		-2,000,000	1,000,000
Current State and Local Tax Expense (Benefit)										0		-2,000,000	-2,000,000
Current Foreign Tax Expense (Benefit)										22,000,000		30,000,000	20,000,000
Current Income Tax Expense (Benefit)										20,000,000		26,000,000	19,000,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)										-6,000,000		56,000,000	-22,000,000
Deferred State and Local Income Tax Expense (Benefit)										8,000,000		2,000,000	2,000,000
Deferred Foreign Income Tax Expense (Benefit)										-17,000,000		-16,000,000	-27,000,000
Deferred Income Tax Expense (Benefit)										-15,000,000		42,000,000	-47,000,000
Total income tax expense (benefit)	-4,000,000		27,000,000	21,000,000	-39,000,000	-3,000,000	26,000,000	39,000,000	6,000,000	5,000,000		68,000,000	-28,000,000
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
United States federal statutory rate										35.00%		35.00%	-35.00%
State and local income taxes, net of federal tax benefit										1,000,000		2,000,000	-5,000,000
Foreign tax rate differential										-15,000,000		-11,000,000	-60,000,000
US tax expense/benefit on foreign earnings/loss										-5,000,000		-2,000,000	-62,000,000
Valuation allowance										-1,000,000		17,000,000	127,000,000
Loss on liquidation										0		-10,000,000	0
Uncertain tax positions and settlements										-18,000,000		-1,000,000	-2,000,000
Other, net										5,000,000		-5,000,000	-33,000,000
Effective tax rate										2.00%		25.00%	-70.00%
Components of Deferred Tax Assets [Abstract]
Deferred Tax Assets, Other Employee Benefits	155,000,000					153,000,000				155,000,000		153,000,000
Deferred Tax Assets, Pension Plans	159,000,000					115,000,000				159,000,000		115,000,000
Deferred Tax Assets, Operating Loss Carryforwards	1,046,000,000					1,117,000,000				1,046,000,000		1,117,000,000
Deferred Tax Assets, State and Local	4,000,000					6,000,000				4,000,000		6,000,000
Deferred Tax Assets, Other	113,000,000					135,000,000				113,000,000		135,000,000
Deferred Tax Assets, Gross	1,477,000,000					1,526,000,000				1,477,000,000		1,526,000,000
Valuation Allowance, Amount	-227,000,000					-270,000,000				-227,000,000		-270,000,000
Deferred Tax Assets Total	1,250,000,000					1,256,000,000				1,250,000,000		1,256,000,000
Current Deferred Tax Assets	135,000,000					138,000,000				135,000,000		138,000,000
Components of Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Depreciation	327,000,000					338,000,000				327,000,000		338,000,000
Deferred Tax Liabilities, Amortization	366,000,000					370,000,000				366,000,000		370,000,000
Deferred Tax Liabilities Total	693,000,000					708,000,000				693,000,000		708,000,000
Deferred Tax Liability Not Recognized For Foreign Withholding and United States Federal Income Taxes on Undistributed Earnings of Foreign Subsidiaries	511,000,000									511,000,000
Undistributed Earnings of Foreign Subsidiaries	1,400,000,000									1,400,000,000
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
US federal loss carryforwards	692,000,000									692,000,000
US state loss carryforwards (a)	82,000,000	[1]								82,000,000	[1]
Foreign loss and tax credit carryforwards	104,000,000									104,000,000
Foreign loss and tax credit carryforwards (a)	129,000,000	[1]								129,000,000	[1]
US alternative minimum tax credit	25,000,000									25,000,000
Other US federal and state tax credits	14,000,000									14,000,000
US State Deferred Tax Asset Related to Loss Carryforwards Set to Expire	14,000,000									14,000,000
Foreign Deferred Tax Asset Related to Loss Carryforwards Set to Expire	11,000,000									11,000,000
Operating Loss Carryforwards Expiration Period										3 years
Federal Earnings Before Tax Needed										2,400,000,000
State Earnings Before Tax Needed										2,600,000,000
Foreign Earnings Before Tax Needed										900,000,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits Estimated Range of Change Lower Bound	0									0
Unrecognized Tax Benefits Estimated Range of Change Upper Bound	6,000,000									6,000,000
Unrecognized Tax Benefits, Beginning Balance					155,000,000				161,000,000	155,000,000		161,000,000	170,000,000
Tax Positions Related to Current Year, Gross Additions										2,000,000		2,000,000	12,000,000
Tax Positions Related to Prior Years, Gross Additions										10,000,000		4,000,000	7,000,000
Tax Positions Related to Prior Years, Gross Reductions										-57,000,000		-1,000,000	-14,000,000
Settlements										-1,000,000		-3,000,000	-13,000,000
Lapses on Statutes of Limitations										-3,000,000		-8,000,000	-1,000,000
Unrecognized Tax Benefits, Ending Balance	106,000,000					155,000,000				106,000,000		155,000,000	161,000,000
Income Tax Penalties and Interest [Abstract]
Income Tax Examination, Penalties and Interest Accrued	8,000,000					6,000,000				8,000,000		6,000,000	10,000,000
Income Tax Examination, Penalties and Interest Expense										2,000,000		-3,000,000	-3,000,000
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	78,000,000									78,000,000
Domestic Tax Authority [Member]
Components of Deferred Tax Assets [Abstract]
Deferred Tax Assets, Gross	481,000,000									481,000,000
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	2,200,000,000									2,200,000,000
State and Local Jurisdiction [Member]
Components of Deferred Tax Assets [Abstract]
Deferred Tax Assets, Gross	61,000,000									61,000,000
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	2,400,000,000									2,400,000,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Tax Positions Related to Current Year, Gross Additions										13,000,000		12,000,000
Foreign Tax Authority [Member]
Components of Deferred Tax Assets [Abstract]
Deferred Tax Assets, Gross	242,000,000									242,000,000
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract]
Operating Loss Carryforwards	900,000,000									900,000,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Tax Positions Related to Current Year, Gross Additions										214,000,000		258,000,000
Foreign Tax Authority [Member] | Minimum [Member] | Scenario, Forecast [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Reduction in Valuation Allowance														0
Foreign Tax Authority [Member] | Maximum [Member] | Scenario, Forecast [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Reduction in Valuation Allowance														$14,000,000
[1]	As of December 31, 2014, $14 million US state and $11 million foreign deferred tax assets related to loss carryforwards are set to expire over the next three years.

QUARTERLY_FINANCIAL_INFORMATIO2

QUARTERLY FINANCIAL INFORMATION (unaudited) (DETAIL) (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
Selected Quarterly Financial Information [Abstract]
NET SALES	$1,261	$1,382	$1,355	$1,278	$1,278	$1,320	$1,347	$1,350	$5,276	$5,295	$5,172
COST OF SALES	1,018	1,131	1,107	1,044	1,045	1,067	1,080	1,137	4,300	4,329	4,375
Gross margin	243	251	248	234	233	253	267	213	976	966	797
Earnings before interest and taxes	104	107	73	108	104	106	118	57	392	385	148
Interest expense, net	28	28	31	27	25	29	29	29	114	112	114
Loss on extinguishment of debt	46	0	0	0					-46	0	-74
Less: Income tax expense (benefit)	-4	27	21	-39	-3	26	39	6	5	68	-28
Net Income (Loss) Attributable to Parent	$33	$52	$21	$120	$82	$51	$49	$22	$226	$204	($19)
Basic (dollars per share)	$0.28	$0.44	$0.18	$1.02	$0.70	$0.43	$0.41	$0.19	$1.92	$1.73	($0.16)
Diluted (dollars per share)	$0.28	$0.44	$0.18	$1.01	$0.69	$0.43	$0.41	$0.18	$1.91	$1.71	($0.16)
Dividend (dollars per share)	$0.16	$0.16	$0.16	$0.16

CONDENSED_CONSOLIDATING_FINANC2

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (EARNINGS) (DETAIL) (USD $)	3 Months Ended								12 Months Ended
	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
Condensed Financial Statements Captions [Line Items]
NET SALES	$1,261,000,000	$1,382,000,000	$1,355,000,000	$1,278,000,000	$1,278,000,000	$1,320,000,000	$1,347,000,000	$1,350,000,000	$5,276,000,000	$5,295,000,000	$5,172,000,000
COST OF SALES	1,018,000,000	1,131,000,000	1,107,000,000	1,044,000,000	1,045,000,000	1,067,000,000	1,080,000,000	1,137,000,000	4,300,000,000	4,329,000,000	4,375,000,000
Gross margin	243,000,000	251,000,000	248,000,000	234,000,000	233,000,000	253,000,000	267,000,000	213,000,000	976,000,000	966,000,000	797,000,000
OPERATING EXPENSES
Marketing and administrative expenses									487,000,000	530,000,000	509,000,000
Science and technology expenses									76,000,000	77,000,000	79,000,000
Charges related to cost reduction actions									37,000,000	8,000,000	51,000,000
Other expenses (income), net									-16,000,000	-34,000,000	10,000,000
Total operating expenses									584,000,000	581,000,000	649,000,000
EARNINGS BEFORE INTEREST AND TAXES	104,000,000	107,000,000	73,000,000	108,000,000	104,000,000	106,000,000	118,000,000	57,000,000	392,000,000	385,000,000	148,000,000
Interest expense, net	28,000,000	28,000,000	31,000,000	27,000,000	25,000,000	29,000,000	29,000,000	29,000,000	114,000,000	112,000,000	114,000,000
Loss on extinguishment of debt	-46,000,000	0	0	0					46,000,000	0	74,000,000
EARNINGS (LOSS) BEFORE TAXES									232,000,000	273,000,000	-40,000,000
Income Tax Expense (Benefit)	-4,000,000	27,000,000	21,000,000	-39,000,000	-3,000,000	26,000,000	39,000,000	6,000,000	5,000,000	68,000,000	-28,000,000
EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES AND AFFILIATES									227,000,000	205,000,000	-12,000,000
Equity in net earnings of subsidiaries									0	0	0
Equity in net earnings of affiliates									1,000,000	0	-4,000,000
NET EARNINGS (LOSS)									228,000,000	205,000,000	-16,000,000
Less: Net earnings attributable to noncontrolling interests									2,000,000	1,000,000	3,000,000
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	33,000,000	52,000,000	21,000,000	120,000,000	82,000,000	51,000,000	49,000,000	22,000,000	226,000,000	204,000,000	-19,000,000
Parent Company [Member]
Condensed Financial Statements Captions [Line Items]
NET SALES									0	0	0
COST OF SALES									-12,000,000	-10,000,000	-9,000,000
Gross margin									12,000,000	10,000,000	9,000,000
OPERATING EXPENSES
Marketing and administrative expenses									112,000,000	123,000,000	112,000,000
Science and technology expenses									0	0	0
Charges related to cost reduction actions									1,000,000	0	0
Other expenses (income), net									-38,000,000	-27,000,000	-37,000,000
Total operating expenses									75,000,000	96,000,000	75,000,000
EARNINGS BEFORE INTEREST AND TAXES									-63,000,000	-86,000,000	-66,000,000
Interest expense, net									106,000,000	104,000,000	102,000,000
Loss on extinguishment of debt									46,000,000		74,000,000
EARNINGS (LOSS) BEFORE TAXES									-215,000,000	-190,000,000	-242,000,000
Income Tax Expense (Benefit)									-81,000,000	-72,000,000	-92,000,000
EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES AND AFFILIATES									-134,000,000	-118,000,000	-150,000,000
Equity in net earnings of subsidiaries									360,000,000	322,000,000	131,000,000
Equity in net earnings of affiliates									0	0	0
NET EARNINGS (LOSS)									226,000,000	204,000,000	-19,000,000
Less: Net earnings attributable to noncontrolling interests									0	0	0
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING									226,000,000	204,000,000	-19,000,000
Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
NET SALES									3,646,000,000	3,730,000,000	3,616,000,000
COST OF SALES									3,022,000,000	3,085,000,000	3,015,000,000
Gross margin									624,000,000	645,000,000	601,000,000
OPERATING EXPENSES
Marketing and administrative expenses									247,000,000	267,000,000	259,000,000
Science and technology expenses									58,000,000	58,000,000	61,000,000
Charges related to cost reduction actions									5,000,000	0	0
Other expenses (income), net									17,000,000	-39,000,000	24,000,000
Total operating expenses									327,000,000	286,000,000	344,000,000
EARNINGS BEFORE INTEREST AND TAXES									297,000,000	359,000,000	257,000,000
Interest expense, net									3,000,000	2,000,000	2,000,000
Loss on extinguishment of debt									0		0
EARNINGS (LOSS) BEFORE TAXES									294,000,000	357,000,000	255,000,000
Income Tax Expense (Benefit)									85,000,000	121,000,000	64,000,000
EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES AND AFFILIATES									209,000,000	236,000,000	191,000,000
Equity in net earnings of subsidiaries									151,000,000	86,000,000	-55,000,000
Equity in net earnings of affiliates									0	0	-5,000,000
NET EARNINGS (LOSS)									360,000,000	322,000,000	131,000,000
Less: Net earnings attributable to noncontrolling interests									0	0	0
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING									360,000,000	322,000,000	131,000,000
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
NET SALES									2,005,000,000	1,988,000,000	1,932,000,000
COST OF SALES									1,665,000,000	1,677,000,000	1,745,000,000
Gross margin									340,000,000	311,000,000	187,000,000
OPERATING EXPENSES
Marketing and administrative expenses									128,000,000	140,000,000	138,000,000
Science and technology expenses									18,000,000	19,000,000	18,000,000
Charges related to cost reduction actions									31,000,000	8,000,000	51,000,000
Other expenses (income), net									5,000,000	32,000,000	23,000,000
Total operating expenses									182,000,000	199,000,000	230,000,000
EARNINGS BEFORE INTEREST AND TAXES									158,000,000	112,000,000	-43,000,000
Interest expense, net									5,000,000	6,000,000	10,000,000
Loss on extinguishment of debt									0		0
EARNINGS (LOSS) BEFORE TAXES									153,000,000	106,000,000	-53,000,000
Income Tax Expense (Benefit)									1,000,000	19,000,000	0
EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES AND AFFILIATES									152,000,000	87,000,000	-53,000,000
Equity in net earnings of subsidiaries									0	0	0
Equity in net earnings of affiliates									1,000,000	0	1,000,000
NET EARNINGS (LOSS)									153,000,000	87,000,000	-52,000,000
Less: Net earnings attributable to noncontrolling interests									2,000,000	1,000,000	3,000,000
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING									151,000,000	86,000,000	-55,000,000
Consolidation Eliminations [Member]
Condensed Financial Statements Captions [Line Items]
NET SALES									-375,000,000	-423,000,000	-376,000,000
COST OF SALES									-375,000,000	-423,000,000	-376,000,000
Gross margin									0	0	0
OPERATING EXPENSES
Marketing and administrative expenses									0	0	0
Science and technology expenses									0	0	0
Charges related to cost reduction actions									0	0	0
Other expenses (income), net									0	0	0
Total operating expenses									0	0	0
EARNINGS BEFORE INTEREST AND TAXES									0	0	0
Interest expense, net									0	0	0
Loss on extinguishment of debt									0		0
EARNINGS (LOSS) BEFORE TAXES									0	0	0
Income Tax Expense (Benefit)									0	0	0
EARNINGS (LOSS) BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES AND AFFILIATES									0	0	0
Equity in net earnings of subsidiaries									-511,000,000	-408,000,000	-76,000,000
Equity in net earnings of affiliates									0	0	0
NET EARNINGS (LOSS)									-511,000,000	-408,000,000	-76,000,000
Less: Net earnings attributable to noncontrolling interests									0	0	0
NET EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING									($511,000,000)	($408,000,000)	($76,000,000)

CONDENSED_CONSOLIDATING_FINANC3

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (COMPREHENSIVE EARNINGS) (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements Captions [Line Items]
NET EARNINGS (LOSS)	$228	$205	($16)
Currency translation adjustment	-134	-28	5
Pension and Other Postretirement Adjustment (Net of Tax)	-113	94	-56
Deferred income (Loss) on Hedging Transactions (Net of Tax)	-6	1	2
COMPREHENSIVE EARNINGS (LOSS)	-25	272	-65
Less: Comprehensive earnings attributable to noncontrolling interests	2	1	3
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	-27	271	-68
Parent Company [Member]
Condensed Financial Statements Captions [Line Items]
NET EARNINGS (LOSS)	226	204	-19
Currency translation adjustment	-134	-28	5
Pension and Other Postretirement Adjustment (Net of Tax)	-113	94	-56
Deferred income (Loss) on Hedging Transactions (Net of Tax)	-6	1	2
COMPREHENSIVE EARNINGS (LOSS)	-27	271	-68
Less: Comprehensive earnings attributable to noncontrolling interests	0	0	0
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	-27	271	-68
Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
NET EARNINGS (LOSS)	360	322	131
Currency translation adjustment	0	0	0
Pension and Other Postretirement Adjustment (Net of Tax)	0	0	0
Deferred income (Loss) on Hedging Transactions (Net of Tax)	0	0	0
COMPREHENSIVE EARNINGS (LOSS)	360	322	131
Less: Comprehensive earnings attributable to noncontrolling interests	0	0	0
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	360	322	131
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
NET EARNINGS (LOSS)	153	87	-52
Currency translation adjustment	0	0	0
Pension and Other Postretirement Adjustment (Net of Tax)	0	0	0
Deferred income (Loss) on Hedging Transactions (Net of Tax)	0	0	0
COMPREHENSIVE EARNINGS (LOSS)	153	87	-52
Less: Comprehensive earnings attributable to noncontrolling interests	2	1	3
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	151	86	-55
Consolidation Eliminations [Member]
Condensed Financial Statements Captions [Line Items]
NET EARNINGS (LOSS)	-511	-408	-76
Currency translation adjustment	0	0	0
Pension and Other Postretirement Adjustment (Net of Tax)	0	0	0
Deferred income (Loss) on Hedging Transactions (Net of Tax)	0	0	0
COMPREHENSIVE EARNINGS (LOSS)	-511	-408	-76
Less: Comprehensive earnings attributable to noncontrolling interests	0	0	0
COMPREHENSIVE EARNINGS (LOSS) ATTRIBUTABLE TO OWENS CORNING	($511)	($408)	($76)

CONDENSED_CONSOLIDATING_FINANC4

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (BALANCE SHEET) (DETAIL) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$67		$57		$55	$52
Receivables, net	674		683
Due from affiliates, current	0		0
Inventories	817		810
Assets held for sale – current	16		29
Other current assets	233		269
Total current assets	1,807		1,848
Investment in subsidiaries	0		0
Due from affiliates, noncurrent	0		0
Property, plant and equipment, net	2,899		2,932
Goodwill	1,168		1,166
Intangible assets	1,017		1,040
Deferred income taxes	444		436
Other non-current assets	220		225
TOTAL ASSETS	7,555		7,647
CURRENT LIABILITIES
Accounts payable and accrued liabilities	949		988
Due to affiliates, current	0		0
Short-term debt	31		1
Long-term debt – current portion	3		3
Total current liabilities	983		992
Long-term debt, net of current portion	1,991		2,024
Due to affiliates, noncurrent	0		0
Pension plan liability	447		336
Other employee benefits liability	252		242
Deferred income taxes	22		23
Other liabilities	130		200
OWENS CORNING STOCKHOLDERS' EQUITY
Preferred stock	0	[1]	0	[1]
Common stock	1	[2]	1	[2]
Additional paid in capital	3,954		3,938
Accumulated earnings	805		655
Accumulated other comprehensive deficit	-550		-297		-364
Cost of common stock in treasury (c)	-518	[3]	-504	[3]
Total Owens Corning stockholders’ equity	3,692		3,793
Noncontrolling interests	38		37
Total equity	3,730		3,830		3,575	3,741
TOTAL LIABILITIES AND EQUITY	7,555		7,647
Parent Company [Member]
CURRENT ASSETS
Cash and cash equivalents	0		0		0	0
Receivables, net	0		0
Due from affiliates, current	0		0
Inventories	0		0
Assets held for sale – current	0		0
Other current assets	7		45
Total current assets	7		45
Investment in subsidiaries	7,504		7,229
Due from affiliates, noncurrent	0		0
Property, plant and equipment, net	359		362
Goodwill	0		0
Intangible assets	0		0
Deferred income taxes	35		14
Other non-current assets	30		31
TOTAL ASSETS	7,935		7,681
CURRENT LIABILITIES
Accounts payable and accrued liabilities	47		15
Due to affiliates, current	1,913		1,688
Short-term debt	0		0
Long-term debt – current portion	0		0
Total current liabilities	1,960		1,703
Long-term debt, net of current portion	1,851		1,814
Due to affiliates, noncurrent	0		0
Pension plan liability	310		213
Other employee benefits liability	0		0
Deferred income taxes	0		0
Other liabilities	122		158
OWENS CORNING STOCKHOLDERS' EQUITY
Preferred stock	0		0
Common stock	1		1
Additional paid in capital	3,954		3,938
Accumulated earnings	805		655
Accumulated other comprehensive deficit	-550		-297
Cost of common stock in treasury (c)	-518		-504
Total Owens Corning stockholders’ equity	3,692		3,793
Noncontrolling interests	0		0
Total equity	3,692		3,793
TOTAL LIABILITIES AND EQUITY	7,935		7,681
Guarantor Subsidiaries [Member]
CURRENT ASSETS
Cash and cash equivalents	1		3		3	0
Receivables, net	0		0
Due from affiliates, current	2,858		2,664
Inventories	527		487
Assets held for sale – current	0		0
Other current assets	132		140
Total current assets	3,518		3,294
Investment in subsidiaries	2,590		2,558
Due from affiliates, noncurrent	0		67
Property, plant and equipment, net	1,397		1,313
Goodwill	1,127		1,127
Intangible assets	989		1,015
Deferred income taxes	380		416
Other non-current assets	62		64
TOTAL ASSETS	10,063		9,854
CURRENT LIABILITIES
Accounts payable and accrued liabilities	667		608
Due to affiliates, current	0		0
Short-term debt	25		0
Long-term debt – current portion	1		2
Total current liabilities	693		610
Long-term debt, net of current portion	15		26
Due to affiliates, noncurrent	881		959
Pension plan liability	0		0
Other employee benefits liability	237		226
Deferred income taxes	0		0
Other liabilities	175		246
OWENS CORNING STOCKHOLDERS' EQUITY
Preferred stock	0		0
Common stock	0		0
Additional paid in capital	6,483		6,572
Accumulated earnings	1,579		1,215
Accumulated other comprehensive deficit	0		0
Cost of common stock in treasury (c)	0		0
Total Owens Corning stockholders’ equity	8,062		7,787
Noncontrolling interests	0		0
Total equity	8,062		7,787
TOTAL LIABILITIES AND EQUITY	10,063		9,854
Non Guarantor Subsidiaries [Member]
CURRENT ASSETS
Cash and cash equivalents	66		54		52	52
Receivables, net	674		683
Due from affiliates, current	0		0
Inventories	290		323
Assets held for sale – current	16		29
Other current assets	94		84
Total current assets	1,140		1,173
Investment in subsidiaries	558		558
Due from affiliates, noncurrent	881		959
Property, plant and equipment, net	1,143		1,257
Goodwill	41		39
Intangible assets	238		271
Deferred income taxes	29		6
Other non-current assets	128		130
TOTAL ASSETS	4,158		4,393
CURRENT LIABILITIES
Accounts payable and accrued liabilities	235		365
Due to affiliates, current	945		976
Short-term debt	6		1
Long-term debt – current portion	2		1
Total current liabilities	1,188		1,343
Long-term debt, net of current portion	125		184
Due to affiliates, noncurrent	0		67
Pension plan liability	137		123
Other employee benefits liability	15		16
Deferred income taxes	22		23
Other liabilities	43		42
OWENS CORNING STOCKHOLDERS' EQUITY
Preferred stock	0		0
Common stock	0		0
Additional paid in capital	1,927		2,045
Accumulated earnings	663		513
Accumulated other comprehensive deficit	0		0
Cost of common stock in treasury (c)	0		0
Total Owens Corning stockholders’ equity	2,590		2,558
Noncontrolling interests	38		37
Total equity	2,628		2,595
TOTAL LIABILITIES AND EQUITY	4,158		4,393
Consolidation Eliminations [Member]
CURRENT ASSETS
Cash and cash equivalents	0		0		0	0
Receivables, net	0		0
Due from affiliates, current	-2,858		-2,664
Inventories	0		0
Assets held for sale – current	0		0
Other current assets	0		0
Total current assets	-2,858		-2,664
Investment in subsidiaries	-10,652		-10,345
Due from affiliates, noncurrent	-881		-1,026
Property, plant and equipment, net	0		0
Goodwill	0		0
Intangible assets	-210		-246
Deferred income taxes	0		0
Other non-current assets	0		0
TOTAL ASSETS	-14,601		-14,281
CURRENT LIABILITIES
Accounts payable and accrued liabilities	0		0
Due to affiliates, current	-2,858		-2,664
Short-term debt	0		0
Long-term debt – current portion	0		0
Total current liabilities	-2,858		-2,664
Long-term debt, net of current portion	0		0
Due to affiliates, noncurrent	-881		-1,026
Pension plan liability	0		0
Other employee benefits liability	0		0
Deferred income taxes	0		0
Other liabilities	-210		-246
OWENS CORNING STOCKHOLDERS' EQUITY
Preferred stock	0		0
Common stock	0		0
Additional paid in capital	-8,410		-8,617
Accumulated earnings	-2,242		-1,728
Accumulated other comprehensive deficit	0		0
Cost of common stock in treasury (c)	0		0
Total Owens Corning stockholders’ equity	-10,652		-10,345
Noncontrolling interests	0		0
Total equity	-10,652		-10,345
TOTAL LIABILITIES AND EQUITY	($14,601)		($14,281)
[1]	10 shares authorized; none issued or outstanding at December 31, 2014 and December 31, 2013
[2]	400 shares authorized; 135.5 issued and 117.8 outstanding at December 31, 2014 and December 31, 2013
[3]	17.7 shares at December 31, 2014 and December 31, 2013

CONDENSED_CONSOLIDATING_FINANC5

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (CASH FLOWS) (DETAIL) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Adjustments to reconcile net earnings (loss) to cash provided by operating activities:
Net cash flow provided by operating activities	$441	$407	$330
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	-363	-335	-304
Derivative settlements	5	0	0
Proceeds from the sale of assets or affiliates	65	0	10
Investment in subsidiaries and affiliates, net	-12	-62	0
Proceeds from Hurricane Sandy insurance claims	0	58	20
Deposit related to sale of Hangzhou, China plant	0	34	0
Purchases of alloy	-28	-18	-28
Proceeds from the sale of alloy	47	16	49
Net cash flow used for investing activities	-286	-307	-253
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	1,276	1,063	1,877
Payments on senior revolving credit and receivables securitization facilities	-1,344	-1,103	-1,957
Proceeds from long-term debt	390	0	599
Payments on long-term debt	-402	-2	-441
Dividends paid	-56	0	0
Purchase of noncontrolling interest	0	0	-22
Net increase (decrease) in short-term debt	30	-4	-23
Purchases of treasury stock	-44	-63	-113
Other	8	13	4
Other intercompany loans	0	0	0
Net cash flow provided by used for financing activities	-142	-96	-76
Effect of exchange rate changes on cash	-3	-2	2
Net increase in cash and cash equivalents	10	2	3
Cash and cash equivalents at beginning of period	57	55	52
Cash and cash equivalents at end of period	67	57	55
Parent Company [Member]
Adjustments to reconcile net earnings (loss) to cash provided by operating activities:
Net cash flow provided by operating activities	-110	-116	-108
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	-13	-10	-14
Derivative settlements	0
Proceeds from the sale of assets or affiliates	44		0
Investment in subsidiaries and affiliates, net	0	0
Proceeds from Hurricane Sandy insurance claims		0	0
Deposit related to sale of Hangzhou, China plant		0
Purchases of alloy	0	0	-21
Proceeds from the sale of alloy	4	16	42
Net cash flow used for investing activities	35	6	7
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	1,226	940	1,564
Payments on senior revolving credit and receivables securitization facilities	-1,238	-1,002	-1,627
Proceeds from long-term debt	390		599
Payments on long-term debt	-400	0	-430
Dividends paid	-56
Purchase of noncontrolling interest			0
Net increase (decrease) in short-term debt	0	0	-8
Purchases of treasury stock	-44	-63	-113
Other	8	13	4
Other intercompany loans	189	222	112
Net cash flow provided by used for financing activities	75	110	101
Effect of exchange rate changes on cash	0	0	0
Net increase in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Guarantor Subsidiaries [Member]
Adjustments to reconcile net earnings (loss) to cash provided by operating activities:
Net cash flow provided by operating activities	470	298	239
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	-219	-143	-174
Derivative settlements	0
Proceeds from the sale of assets or affiliates	0		5
Investment in subsidiaries and affiliates, net	-5	-51
Proceeds from Hurricane Sandy insurance claims		58	20
Deposit related to sale of Hangzhou, China plant		0
Purchases of alloy	0	0	0
Proceeds from the sale of alloy	0		0
Net cash flow used for investing activities	-224	-136	-149
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	0	0	0
Payments on senior revolving credit and receivables securitization facilities	0	0	0
Proceeds from long-term debt	0		0
Payments on long-term debt	0	0	0
Dividends paid	0
Purchase of noncontrolling interest			-22
Net increase (decrease) in short-term debt	25	0	0
Purchases of treasury stock	0	0	0
Other	0	0	0
Other intercompany loans	-273	-162	-65
Net cash flow provided by used for financing activities	-248	-162	-87
Effect of exchange rate changes on cash	0	0	0
Net increase in cash and cash equivalents	-2	0	3
Cash and cash equivalents at beginning of period	3	3	0
Cash and cash equivalents at end of period	1	3	3
Non Guarantor Subsidiaries [Member]
Adjustments to reconcile net earnings (loss) to cash provided by operating activities:
Net cash flow provided by operating activities	81	225	199
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	-131	-182	-116
Derivative settlements	5
Proceeds from the sale of assets or affiliates	21		5
Investment in subsidiaries and affiliates, net	-7	-11
Proceeds from Hurricane Sandy insurance claims		0	0
Deposit related to sale of Hangzhou, China plant		34
Purchases of alloy	-28	-18	-7
Proceeds from the sale of alloy	43		7
Net cash flow used for investing activities	-97	-177	-111
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	50	123	313
Payments on senior revolving credit and receivables securitization facilities	-106	-101	-330
Proceeds from long-term debt	0		0
Payments on long-term debt	-2	-2	-11
Dividends paid	0
Purchase of noncontrolling interest			0
Net increase (decrease) in short-term debt	5	-4	-15
Purchases of treasury stock	0	0	0
Other	0	0	0
Other intercompany loans	84	-60	-47
Net cash flow provided by used for financing activities	31	-44	-90
Effect of exchange rate changes on cash	-3	-2	2
Net increase in cash and cash equivalents	12	2	0
Cash and cash equivalents at beginning of period	54	52	52
Cash and cash equivalents at end of period	66	54	52
Consolidation Eliminations [Member]
Adjustments to reconcile net earnings (loss) to cash provided by operating activities:
Net cash flow provided by operating activities	0	0	0
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	0	0	0
Derivative settlements	0
Proceeds from the sale of assets or affiliates	0		0
Investment in subsidiaries and affiliates, net	0	0
Proceeds from Hurricane Sandy insurance claims		0	0
Deposit related to sale of Hangzhou, China plant		0
Purchases of alloy	0	0	0
Proceeds from the sale of alloy	0		0
Net cash flow used for investing activities	0	0	0
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	0	0	0
Payments on senior revolving credit and receivables securitization facilities	0	0	0
Proceeds from long-term debt	0		0
Payments on long-term debt	0	0	0
Dividends paid	0
Purchase of noncontrolling interest			0
Net increase (decrease) in short-term debt	0	0	0
Purchases of treasury stock	0	0	0
Other	0	0	0
Other intercompany loans	0	0	0
Net cash flow provided by used for financing activities	0	0	0
Effect of exchange rate changes on cash	0	0	0
Net increase in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Misclassification of Interest Payments on Parent Loans [Member] | Parent Company [Member]
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Net Cash Provided by (Used in) Operating and Financing Activities		242
Misclassification of Interest Payments on Parent Loans [Member] | Guarantor Subsidiaries [Member]
NET CASH FLOW PROVIDED BY USED FOR FINANCING ACTIVITIES
Net Cash Provided by (Used in) Operating and Financing Activities		$242

SCHEDULE_II_VALUATION_AND_QUAL1

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (DETAILS) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$14	$17		$15
Charged to Costs and Expenses	2	3		3
Charged to Other Accounts	0	0		0
Deductions	-6	-6	[1]	-1	[1]
Acquisitions and Divestitures	0	0		0
Balance at End of Period	10	14		17
Tax Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	270	228		187
Charged to Costs and Expenses	-15	46		51
Charged to Other Accounts	-17	0		0
Deductions	-11	-4		-10
Acquisitions and Divestitures		0		0
Balance at End of Period	$227	$270		$228
[1]	Uncollectible accounts written off, net of recoveries.