Owens Corning (OC) 10-Q 23 Oct 13 2013 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	Owens Corning
Entity Central Index Key	1370946
Document Type	10-Q
Document Period End Date	30-Sep-13
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
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 Common Stock Shares Outstanding	118,510,793

CONSOLIDATED_STATEMENTS_OF_EAR

CONSOLIDATED STATEMENTS OF EARNINGS (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED STATEMENTS OF EARNINGS
NET SALES	$1,320	$1,276	$4,017	$4,013
COST OF SALES	1,067	1,074	3,284	3,386
Gross margin	253	202	733	627
OPERATING EXPENSES
Marketing and administrative expenses	128	115	395	380
Science and technology expenses	19	20	57	60
Charges related to cost reduction actions	6	0	8	36
Other expenses, net	-6	8	-8	19
Total operating expenses	147	143	452	495
Earnings before interest and taxes	106	59	281	132
Interest expense, net	29	29	87	85
EARNINGS BEFORE TAXES	77	30	194	47
Less: Income tax expense (benefit)	26	-14	71	8
Equity in net earnings of affiliates	0	0	0	0
NET EARNINGS	51	44	123	39
Less: Net earnings attributable to noncontrolling interests	0	0	1	2
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	$51	$44	$122	$37
Earnings Per Share Abstract
Basic	$0.43	$0.37	$1.03	$0.31
Diluted	$0.43	$0.37	$1.02	$0.31
Weighted Average Common Shares [Abstract]
Basic	118	117.9	118.4	119.8
Diluted	118.8	118.8	119.3	120.6

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income Abstract
NET EARNINGS	$51	$44	$123	$39
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	15	28	-30	9
Pension and other postretirement adjustment (net of tax)	2	-1	11	-2
Deferred loss on hedging transactions (net of tax)	0	2	0	3
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total	68	73	104	49
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest	0	0	1	2
Comprehensive Income, Net of Tax, Attributable to Parent, Total	$68	$73	$103	$47

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEET (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$51		$55		$51	$52
Receivables, less allowances	758		600
Inventories	834		786
Other current assets	270		176
Total current assets	1,913		1,617
Property, plant and equipment, net	2,905		2,903
Goodwill balance	1,166		1,143
Intangible assets	1,046		1,045
Deferred income taxes	482		604
Other non-current assets	215		256
TOTAL ASSETS	7,727		7,568
CURRENT LIABILITIES
Accounts Payable and Accrued Liabilities, Current	938		907
Short-term debt	8		5
Long-term debt - current portion	3		4
Total current liabilities	949		916
Long-term debt, net of current portion	2,175		2,076
Pension plan liability	452		480
Other employee benefits liability	265		274
Deferred income tax liability	35		38
Other liabilities	200		209
Commitments and Contingencies
OWENS CORNING STOCKHOLDERS' EQUITY
Preferred stock	0	[1]	0	[1]
Additional paid in capital	3,961		3,925
Accumulated earnings (deficit)	573		451
Accumulated other comprehensive deficit	-382		-364
Cost of common stock in treasury (c)	538	[2]	475	[2]
Total Owens Corning stockholders' equity	3,615		3,538
Noncontrolling interest	36		37
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,651		3,575
TOTAL LIABILITIES AND EQUITY	$7,727		$7,568
[1]	10 shares authorized; none issued or outstanding at Sep. 30, 2013, and Dec. 31, 2012
[2]	17.8 shares at Sep. 30, 2013, and 17.3 shares at Dec. 31, 2012

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, except Per Share data, unless otherwise specified
Consolidated Balance Sheets Parentheticals [Abstract]
Allowance for doubtful accounts	$13	$17
Preferred stock, par value	$0.01	$0.01
Preferred stock, authorized	10	10
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, authorized	400	400
Common stock, issued	135.5	135.6
Common stock, outstanding	117.7	118.3
Treasury stock shares	17.8	17.3

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
NET CASH FLOW PROVIDED BY (USED FOR) OPERATING ACTIVITIES
NET EARNINGS	$123	$39
Adjustments to reconcile net earnings to cash provided by (used for) operating activities:
Depreciation and amortization	235	269
Gain on sale of business and fixed assets	-6	-3
Impairment of long-lived assets	0	0
Deferred income taxes	57	-25
Provision for pension and other employee benefits liabilities	27	33
Share Based Compensation	21	18
Other non-cash	-13	-9
Restricted cash	0	0
Change in working capital	-214	-171
Pension fund contribution	-30	-42
Payments for other employee benefits liabilities	-16	-17
Other	-21	1
Net cash flow provided by (used for) operating activities	163	93
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Additions to plant and equipment	-199	-235
Payments to Acquire Businesses, Net of Cash Acquired	62	0
Proceeds from the sale of assets or affiliates	16	0
Net cash flow used for investing activities	-217	-223
Proceeds from Hurricane Sandy Insurance Claims	26	0
NET CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES
Proceeds from senior revolving credit and receivables securitization facilities	1,063	1,205
Payments on senior revolving credit and receivables securitization facilities	-957	-929
Proceeds from long-term debt	0	0
Payments on long-term debt	-1	-13
Net decrease in short-term debt	3	-9
Purchase of treasury stock	-63	-113
Other Financing	7	9
Net cash flow provided by (used for) financing activities	52	128
Effect of exchange rate changes on cash	-2	1
Net decrease in cash and cash equivalents	-4	-1
Cash and cash equivalents at beginning of period	55	52
Cash and cash equivalents at end of period	$51	$51

GENERAL

GENERAL	9 Months Ended
	Sep. 30, 2013
General Disclosure [Abstract]
Accounting Changes and Error Corrections [Text Block]	1.       GENERAL
	Unless the context requires otherwise, the terms “Owens Corning,” “Company,” “we” and “our” in this report refer to Owens Corning, a Delaware corporation, and its subsidiaries.
	The Consolidated Financial Statements included in this report are unaudited, pursuant to certain rules and regulations of the Securities and Exchange Commission, and include, in the opinion of the Company, adjustments necessary for a fair statement of the results for the periods indicated, which, however, are not necessarily indicative of results which may be expected for the full year. The December 31, 2012, balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States (U.S.). In connection with the Consolidated Financial Statements and Notes included in this report, reference is made to the Consolidated Financial Statements and Notes contained in the Company's 2012 annual report on Form 10-K. Certain reclassifications have been made to the periods presented for 2012 to conform to the classifications used in the periods presented for 2013.

SEGMENT_INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]
SEGMENT INFORMATION	2.       SEGMENT INFORMATION
	The Company has two reportable segments: Composites and Building Materials. Accounting policies for the segments are the same as those for the Company. The Company's 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.
	Building Materials – comprised of our Insulation and Roofing businesses. Within the 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. Within the Roofing business, the Company manufactures and sells residential roofing shingles and oxidized asphalt materials used in residential and commercial construction and specialty applications.
	NET SALES
	The following table summarizes our net sales by segment, geographic region and product group (in millions). External customer sales are attributed to geographic region based upon the location from which the product is shipped to the external customer.
			Three Months Ended				Nine Months Ended
			Sep. 30,				Sep. 30,
			2013		2012		2013		2012
	Reportable Segments
	Composites		$	453	$	459	$	1,384	$	1,433
	Building Materials			902		855		2,762		2,719
		Total reportable segments		1,355		1,314		4,146		4,152
	Corporate eliminations			-35		-38		-129		-139
	NET SALES		$	1,320	$	1,276	$	4,017	$	4,013
	External Customer Sales by Geographic Region
	United States		$	909	$	856	$	2,797	$	2,755
	Europe			135		133		412		431
	Asia Pacific			156		165		455		477
	Other			120		122		353		350
	NET SALES		$	1,320	$	1,276	$	4,017	$	4,013
	Sales by Product Group
	Composites		$	453	$	459	$	1,384	$	1,433
	Insulation			431		384		1,176		1,055
	Roofing			471		471		1,586		1,664
	Corporate Eliminations			-35		-38		-129		-139
	NET SALES		$	1,320	$	1,276	$	4,017	$	4,013
	Earnings Before Interest and Taxes
	Earnings before interest and taxes (“EBIT”) by segment consist 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):
			Three Months Ended				Nine Months Ended
			Sep. 30,				Sep. 30,
			2013		2012		2013		2012
	Reportable Segments
	Composites		$	21	$	11	$	62	$	68
	Building Materials			114		86		332		242
		Total reportable segments	$	135	$	97	$	394	$	310
	Corporate, Other and Eliminations
	Charges related to cost reduction actions and related items (a)		$	-11	$	-22	$	-23	$	-109
	Losses related to Hurricane Sandy			-2		-		-16		-
	General corporate expense and other			-16		-16		-74		-69
	EBIT		$	106	$	59	$	281	$	132
	For the three months ended September 30, 2013 and 2012, includes $6 million and $0 million, respectively, of charges related to cost reduction actions and $5 million and $22 million, respectively, of other related cost reduction action items. For the nine months ended September 30, 2013 and 2012, includes $8 million and $36 million, respectively, of charges related to cost reduction actions and $15 million and $73 million, respectively, of other related items.

INVENTORIES

INVENTORIES	9 Months Ended
	Sep. 30, 2013
Inventories Abstract
INVENTORIES	3. INVENTORIES
	Inventories consist of the following (in millions):
		Sep. 30,		Dec. 31,
		2013		2012
	Finished goods	$	584	$	554
	Materials and supplies		250		232
	Total inventories	$	834	$	786

DERIVATIVE_FINANCIAL_INSTRUMEN

DERIVATIVE FINANCIAL INSTRUMENTS	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	4.       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 September 30, 2013, and December 31, 2012, 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 of derivatives and hedging instruments and the respective location on the Consolidated Balance Sheets (in millions):
						Fair Value at
						Sep. 30,			Dec. 31,
				Location		2013			2012
	Derivative liabilities designated as hedging instruments:
	Cash flow hedges:
				Accounts payable and
		Natural gas and electricity			accrued liabilities	$	1		$	1
		Amount of loss recognized in OCI (effective portion)		OCI		$	1		$	1
	Fair value hedges:
			1	Accounts payable and
		Interest rate swaps	1		accrued liabilities	$	1		$	-
	Derivative assets not designated as hedging instruments:
		Foreign exchange contracts		Other current assets		$	1		$	1
	Derivative liabilities not designated as hedging instruments:
				Accounts payable and
		Foreign exchange contracts			accrued liabilities	$	1		$	3
	The following table presents the impact and respective location of derivative activities on the Consolidated Statements of Earnings (in millions):
							Three Months Ended					Nine Months Ended
							Sep. 30,					Sep. 30,
					Location		2013			2012		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		$	1	$	-	$	6
	Interest rate swaps:
		Amount of loss recognized in earnings			Interest expense		$	-		$	-	$	-	$	-
	Derivative activity not designated as hedging instruments:
	Natural gas and electricity:
		Amount of (gain) recognized in earnings			Other (income) expenses, net		$	-		$	-	$	-	$	-1
	Foreign currency exchange contract:
		Amount of loss recognized in earnings (a)			Other (income) expenses, net		$	1		$	1	$	12	$	5
	(a)	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 expenses.
	Cash Flow Hedges
	The Company uses forward and swap contracts, which qualify as cash flow hedges, to manage forecasted exposure to commodity prices. The effective portion of the change in the fair value of cash flow hedges is deferred in accumulated OCI and is subsequently recognized in cost of sales on the Consolidated Statements of Earnings 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 (income) expenses, net on the Consolidated Statements of Earnings.
	The Company currently has natural gas and electricity commodity derivatives designated as hedging instruments that mature within 15 months. The Company's policy for natural gas exposures is to hedge up to 75% of its total forecasted exposures for the next two months, up to 50% 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% of its total forecasted exposures for the current calendar year and up to 65% 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 September 30, 2013, $1 million of losses included in accumulated 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 amounts include the recognition of the hedged item through earnings.
	Fair Value Hedges
	The Company manages its interest rate exposure by balancing the mixture of its fixed and variable rate instruments 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.
	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 (income) expenses, net on the Consolidated Statements of Earnings.

GOODWILL_AND_OTHER_INTANGIBLE_

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	5. GOODWILL AND OTHER INTANGIBLE ASSETS
	Intangible assets and goodwill consist of the following (in millions):
	Sep. 30, 2013			Weighted Average Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	Amortizable intangible assets:
		Customer relationships		18	$	180	$	-65	$	115
		Technology		20		196		-71		125
		Franchise and other agreements		14		36		-16		20
	Indefinite-lived intangible assets:
		Trademarks				786		-		786
			Total intangible assets		$	1,198	$	-152	$	1,046
	Goodwill				$	1,166
	Dec. 31, 2012			Weighted Average Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	Amortizable intangible assets:
		Customer relationships		19	$	169	$	-58	$	111
		Technology		20		198		-64		134
		Franchise and other agreements		14		37		-14		23
	Indefinite-lived intangible assets:
		Trademarks				777		-		777
			Total intangible assets		$	1,181	$	-136	$	1,045
	Goodwill				$	1,143
	The changes in the net carrying amount of goodwill by segment are as follows (in millions):
			Composites		Building Materials			Total
	Balance as of December 31, 2012		$	56	$	1,087	$	1,143
	Acquisitions (see Note 7)			2		22		24
	Foreign currency adjustments			-1		0		-1
	Balance as of September 30, 2013		$	57	$	1,109	$	1,166
	Other Intangible Assets
	The Company expects the ongoing amortization expense for amortizable intangible assets to be approximately $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 our amortizable intangible assets.
	Goodwill
	The Company tests goodwill and indefinite-lived intangible assets for impairment during the fourth quarter of 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. No testing was deemed necessary in the third quarter of 2013.

PROPERTY_PLANT_AND_EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	9 Months Ended
	Sep. 30, 2013
Property, Plant And Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	6.       PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment consist of the following (in millions):
		Sep. 30,		Dec. 31,
		2013		2012
	Land	$	222	$	222
	Buildings and leasehold improvements		817		789
	Machinery and equipment		3,302		3,223
	Construction in progress		202		147
			4,543		4,381
	Accumulated depreciation		-1,638		-1,478
	Property, plant and equipment, net	$	2,905	$	2,903

ACQUISITIONS

ACQUISITIONS	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	7.       ACQUISITIONS
	During the third quarter of 2013, the Company made cash payments of $10 million related to our July 31, 2011 acquisitions of FiberTEK Insulation West, LLC and FiberTEK Insulation, LLC. Deferred payments totaling $15 million remain outstanding and are due in annual installments through 2018. As of September 30, 2013, the deferred payments are recorded at their net present value of $5 million in accounts payable and accrued liabilities and $8 million in other liabilities on the Consolidated Balance Sheets.
	During the second quarter of 2013 the Company completed the acquisitions of Thermafiber Inc., a leading manufacturer of mineral wool commercial and industrial insulation products located in Indiana and Tanaka Kikinzoku (Suzhou) Co., Ltd, a producer of glass fiber bushings in China.
	The Company provided total consideration that had a fair value of $52 million at the acquisition dates. The acquisitions resulted in the recognition of $19 million in intangible assets; and $24 million in goodwill. The pro-forma effect of these acquisitions on revenues and earnings was not material.

WARRANTIES

WARRANTIES	9 Months Ended
	Sep. 30, 2013
Warranties [Abstract]
WARRANTIES	9.       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):
				Nine Months Ended
				Sep. 30, 2013
	Beginning balance		$	41
		Amounts accrued for current year		18
		Settlements of warranty claims		-18
	Ending balance		$	41

COST_REDUCTION_ACTIONS

COST REDUCTION ACTIONS	9 Months Ended
	Sep. 30, 2013
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	10.       COST REDUCTION ACTIONS
	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 8 above, we have recorded $6 million in charges related to cost reduction actions on the Consolidated Statements of Earnings for the three month period ended September 30, 2013.
	The following table summarizes the status of the unpaid liabilities from the Company's 2013 cost reduction actions (in millions):
		Beginning Balance Dec. 31, 2012		Costs Incurred		Payments		Ending Balance Sep. 30, 2013		Cumulative Charges Incurred
	Severance	$	-	$	6	$	-	$	6	$	6
	Total	$	-	$	6	$	-	$	6	$	6
	2012 Cost Reduction Actions
	As a result of evaluating market conditions in our Composites segment, we took actions to improve the competitive position of our global manufacturing network by closing certain facilities, with our most significant actions taking place in France, Spain and Italy. These actions were primarily due to market conditions that led to lower capacity requirements within the European region. In conjunction with these actions, the Company recorded $5 million and $17 million in charges related to cost reduction actions and related items for the three and nine months ended September 30, 2013, respectively; of which, $0 million and $2 million, respectively, is related to severance and is included in charges related to cost reduction actions on the Consolidated Statements of Earnings. The $5 million and $15 million of other charges consist of $2 million and $6 million in accelerated depreciation due to the shortened expected useful life of the closed facilities and $3 million and $9 million in other related charges that primarily consisted of facility closure and related other exit costs, respectively.
	The following table summarizes the status of the unpaid liabilities from the Company's 2012 cost reduction actions (in millions):
		Beginning Balance Dec. 31, 2012		Costs Incurred		Payments		Ending Balance Sep. 30, 2013		Cumulative Charges Incurred
	Severance	$	45	$	2	$	15	$	32	$	53
	Total	$	45	$	2	$	15	$	32	$	53

DEBT

DEBT	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]
DEBT	11. DEBT
	Details of the Company's outstanding long-term debt are as follows (in millions):
			Sep. 30,		Dec. 31,
			2013		2012
	6.50% senior notes, net of discount, due 2016		$	400	$	400
	9.00% senior notes, net of discount, due 2019			248		247
	4.20% senior notes, net of discount, due 2022			599		599
	7.00% senior notes, net of discount, due 2036			540		540
	Accounts receivable securitization facility, maturing in 2016			212		141
	Senior revolving credit facility, maturing in 2016			108		73
	Various capital leases, due through and beyond 2050			50		52
	Various floating rate debt, maturing through 2027			1		2
	Fair value adjustment to debt			20		26
	Total long-term debt			2,178		2,080
	Less – current portion			3		4
		Long-term debt, net of current portion	$	2,175	$	2,076
	Senior Notes
	The Company issued $600 million of senior notes on October 17, 2012, $350 million of senior notes on June 3, 2009, and $1.2 billion of senior notes on October 31, 2006, which are collectively 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 September 30, 2013.
	In the fourth quarter of 2011, the Company terminated all of its then existing 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 Facility
	In July 2011, 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 July 2016 and reduce the pricing. 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 September 30, 2013.
	The Company had $4 million of letters of credit outstanding under the Senior Revolving Credit Facility at September 30, 2013 and December 31, 2012.
	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 the third quarter of 2013 to extend maturity to July 2016 and reduce the size of the facility to $200 million during the months of November, December, and January each year. At September 30, 2013, the Company utilized the full amount permitted under the terms of the RPA. The Company had $38 million and $37 million of letters of credit outstanding under the receivables securitization facility at September 30, 2013 and December 31, 2012, respectively.
	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 September 30, 2013.
	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 who are 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.
	Short-Term Debt
	At September 30, 2013 and December 31, 2012, short-term borrowings were $8 million and $5 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 short-term borrowings was approximately 5.5% for September 30, 2013, and 4.5% for December 31, 2012.

PENSION_PLANS_AND_OTHER_POSTRE

PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS	9 Months Ended
	Sep. 30, 2013
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure Abstract
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS	12.       PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
	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, we elected to begin 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 information regarding pension expense recognized (in millions):
		Three Months Ended						Three Months Ended
		Sep. 30, 2013						Sep. 30, 2012
		U.S.		Non-U.S.		Total		U.S.		Non-U.S.		Total
	Components of Net Periodic Pension Cost
	Service cost	$	2	$	-	$	2	$	3	$	1	$	4
	Interest cost		11		5		16		12		5		17
	Expected return on plan assets		-14		-7		-21		-15		-7		-22
	Amortization of actuarial loss		4		1		5		6		2		8
	Net periodic pension cost	$	3	$	-1	$	2	$	6	$	1	$	7
		Nine Months Ended						Nine Months Ended
		Sep. 30, 2013						Sep. 30, 2012
		U.S.		Non-U.S.		Total		U.S.		Non-U.S.		Total
	Components of Net Periodic Pension Cost
	Service cost	$	7	$	4	$	11	$	7	$	5	$	12
	Interest cost		33		16		49		37		17		54
	Expected return on plan assets		-44		-19		-63		-45		-20		-65
	Amortization of actuarial loss		11		4		15		18		4		22
	Net periodic pension cost	$	7	$	5	$	12	$	17	$	6	$	23
	Postemployment and Postretirement Benefits Other than Pension Plans
	The Company maintains healthcare 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.
	The following table provides the components of net periodic benefit cost for aggregated United States and non-United States Plans for the periods indicated (in millions):
		Three Months Ended				Nine Months Ended
		Sep. 30,				Sep. 30,
		2013		2012		2013		2012
	Components of Net Periodic Benefit Cost
	Service cost	$	1	$	1	$	2	$	2
	Interest cost		2		2		7		8
	Amortization of prior service cost		-1		-1		-3		-3
	Amortization of actuarial gain		-1		-1		-1		-2
	Net periodic benefit cost	$	1	$	1	$	5	$	5

CONTINGENT_LIABILITIES_AND_OTH

CONTINGENT LIABILITIES AND OTHER MATTERS	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
CONTINGENT LIABILITIES AND OTHER MATTERS TEXT BLOCK	13.       CONTINGENT LIABILITIES AND OTHER MATTERS
	Litigation
	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 known 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.
	Environmental Matters
	We have been deemed by the Environmental Protection Agency (“EPA”) to be a Potentially Responsible Party (“PRP”) with respect to certain sites under the Comprehensive Environmental Response Compensation and Liability Act. We have also been deemed a PRP under similar state or local laws and in other instances other PRPs have brought suits against us as a PRP for contribution under such federal, state, or local laws. At September 30, 2013, we had environmental remediation liabilities as a PRP at 20 sites where we have a continuing legal obligation to either complete remedial actions or contribute to the completion of remedial actions as part of a group of PRPs. For these sites we estimate a reserve to reflect environmental liabilities that have been asserted or are probable of assertion, in which liabilities are probable and reasonably estimable. At September 30, 2013, our reserve for such liabilities was $6 million.
	Kearny, New Jersey Manufacturing Facility
	During the week of October 29, 2012, the Company experienced a flood at its Kearny, New Jersey manufacturing facility as a result of Hurricane Sandy. This facility is insured for property damage and business interruption losses related to such events, subject to deductibles and policy limits. The Company believes that all costs/losses will be substantially covered by insurance; however, the timing of any recoveries may result in expenses being taken in periods before the insurance receipts are recorded or received. For the three months ended September 30, 2013, the Company incurred losses related to clean up activities and business interruption in the amount of $4 million reported in Cost of Sales and $9 million reported in Other (income) expenses, net, on the Consolidated Statements of Earnings, partially offset by $11 million of insurance proceeds recorded in Other (income) expenses, net, on the Consolidated Statements of Earnings. For the nine months ended September 30, 2013, the Company incurred losses related to clean up activities and business interruption in the amount of $26 million reported in Cost of Sales and $16 million reported in Other (income) expenses, net, on the Consolidated Statements of Earnings, partially offset by $26 million of insurance proceeds recorded in Other (income) expenses, net, on the Consolidated Statements of Earnings.

STOCK_COMPENSATION

STOCK COMPENSATION	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK COMPENSATION	14.       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 September 30, 2013 the number of shares remaining available under the 2013 Stock Plan for all stock awards was 3.4 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.
	During the nine months ended September 30, 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 6.25 years and a risk-free interest rate of 1.2%.
	During the three and nine months ended September 30, 2013, the Company recognized expense of $1 million and $4 million respectively, related to the Company's stock options. During the three and nine months ended September 30, 2012, the Company recognized expense of $1 million and $3 million respectively, related to the Company's stock options. As of September 30, 2013, 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 2.68 years. The total aggregate intrinsic value of options outstanding as of September 30, 2013 and 2012 was $25 million and $19 million.
	The following table summarizes the Company's stock option activity for the nine months ended Sep. 30, 2013:
													Nine Months Ended
													Sep. 30 2013
													Number of Options	Weighted-Average Exercise Price
	Beginning Balance												3,025,220	$	27.78
	Granted												329,800		42.16
	Exercised												-540,725		26.96
	Forfeited												-56,500		34.58
	Ending Balance												2,757,795	$	29.52
	The following table summarizes information about the Company's options outstanding and exercisable:
			Options Outstanding								Options Exercisable
						Weighted-Average							Weighted-Average
	Range of Exercise Prices		Options Outstanding			Remaining Contractual Life	Exercise Price		Number Exercisable at Sep. 30, 2013			Remaining Contractual Life		Exercise Price
	$13.89- $42.16		2,757,795			5.6	$	29.52		1,948,220			4.45	$	26.73
	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 2017.
	During the three and nine months ended September 30, 2013, the Company recognized expense of $4 million and $12 million respectively, related to the Company's restricted stock. During the three and nine months ended September 30, 2012, the Company recognized expense of $3 million and $11 million respectively. As of September 30, 2013, there was $28 million of total unrecognized compensation cost related to restricted stock. That cost is expected to be recognized over a weighted-average period of 2.75 years. The total fair value of shares vested during the nine months ended September 30, 2013 and 2012 was $16 million and $11 million, respectively.
		Nine Months Ended
		Sep. 30, 2013
		Number of Shares		Weighted-Average Grant-Date Fair Value
	Beginning Balance	1,875,065		$	27.14
	Granted	497,694			41.13
	Vested	-602,501			25.92
	Forfeited	-75,869			34.54
	Ending Balance	1,694,389		$	31.35
	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 in 2013 will be fully settled in stock and outstanding grants issued in 2011 and 2012 will be settled 50 percent in stock and 50 percent 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.
	In the first nine months of 2013, the Company granted PSUs. The 2013 grants vest after a three-year period based on the Company's total stockholder return relative to the performance of the companies in the S&P 500 Index for the respective three-year period. The amount of stock distributed will vary from 0% to 200% of PSUs awarded depending on the relative stockholder return performance.
	For all PSUs, respectively during the three and nine months ended September 30, 2013, the Company recognized a gain of $1 million and an expense of $5 million. During the three and nine months ended September 30, 2012, the Company recognized expense of $5 million and $11 million, respectively, related to PSUs. As of September 30, 2013, there was $12 million of total unrecognized compensation cost related to PSUs. That cost is expected to be recognized over a weighted-average period of 1.86 years.
		Nine Months Ended
		Sep. 30, 2013
		Number of PSUs		Weighted-Average Grant-Date Fair Value
	Beginning Balance	412,910		$	49.14
	Granted	207,050			56.71
	Forfeited	-40,550			50.36
	Ending Balance	579,410		$	51.76

EARNINGS_LOSS_PER_SHARE

EARNINGS (LOSS) PER SHARE	9 Months Ended
	Sep. 30, 2013
Earnings Per Share Abstract
EARNINGS (LOSS) PER SHARE	15. EARNINGS PER SHARE
	The following table summarizes the number of shares outstanding as well as our basic and diluted earnings per-share (in millions, except per share amounts):
				Three Months Ended				Nine Months Ended
				Sep. 30,				Sep. 30,
			2013		2012		2013		2012
	Net earnings attributable to Owens Corning		$	51	$	44	$	122	$	37
	Weighted-average number of shares outstanding used for
		basic earnings per share		118		117.9		118.4		119.8
	Non-vested restricted and performance shares			0.4		0.6		0.4		0.5
	Options to purchase common stock			0.4		0.3		0.5		0.3
	Weighted-average number of shares outstanding and common
		equivalent shares used for diluted earnings per share		118.8		118.8		119.3		120.6
	Earnings per common share attributable to Owens Corning
		common stockholders:
		Basic	$	0.43	$	0.37	$	1.03	$	0.31
		Diluted	$	0.43	$	0.37	$	1.02	$	0.31

FAIR_VALUE_MEASUREMENT

FAIR VALUE MEASUREMENT	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	16.       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 September 30, 2013 (in millions):
			Total Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Assets:
	Cash equivalents	$	18	$	18	$	-	$	-
	Term deposits		2		-		2		-
	Derivative assets		1		-		1		-
	Total assets	$	21	$	18	$	3	$	-
	Liabilities:
	Derivative liabilities	$	-3	$	-	$	-3	$	-
	Total liabilities	$	-3	$	-	$	-3	$	-
	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, 2012 (in millions):
			Total Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Assets:
	Cash equivalents	$	1	$	1	$	-	$	-
	Term deposits		1		-		1		-
	Derivative assets		1		-		1		-
	Total assets	$	3	$	1	$	2	$	-
	Liabilities:
	Derivative liabilities	$	-4	$	-	$	-4	$	-
	Total liabilities	$	-4	$	-	$	-4	$	-
	Items Disclosed at Fair Value
	Long-term notes receivable
	The fair value has been calculated using the expected future cash flows discounted at market interest rates. The Company believes that the carrying amounts reasonably approximate the fair values of long-term notes receivable. Long-term notes receivable were $10 million and $53 million as of September 30, 2013, and December 31, 2012, respectively. The decline in the fair value of long-term notes receivable was due to the reclassification of a receivable to other current assets related to the 2011 sale of our Stone business.
	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 September 30, 2013, and December 31, 2012, respectively, the Company's 6.50% senior notes due 2016 were trading at approximately 113% and 112% of par value, the 9.00% senior notes due 2019 were trading at approximately 122% and 127% of par value, the 4.2% senior notes due 2022 were trading at approximately 97% and 102% of par value, and the 7.00% senior notes due 2036 were trading at approximately 109% and 109% of par value.
	At September 30, 2013, and December 31, 2012, 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 $370 million and $268 million respectively.

INCOME_TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]
INCOME TAXES	17.       INCOME TAXES
	Income tax expense for the three and nine months ended September 30, 2013, was $26 million and $71 million, respectively. For the third quarter and year-to-date 2013, the Company's effective tax rate was 34 percent and 37 percent, respectively. For both periods, the difference between the effective tax rate and the statutory rate of 35 percent is primarily attributable to various tax planning initiatives and the tax accounting treatment related to various locations which are currently in a loss position.
	Income tax expense for the three and nine months ended September 30, 2012, was a benefit of $14 million and an expense of $8 million, respectively. For the third quarter and year-to-date 2012, the Company's effective tax rate was (47) percent and 17 percent, respectively. The third quarter 2012 effective tax rate is reflective of a cumulative adjustment attributable to lower estimated tax expense for 2012. For both periods, the difference between the effective tax rate and the statutory rate of 35 percent is primarily attributable to the tax accounting treatment related to various locations which are currently in a loss position and

CHANGES_IN_ACCUMULATED_OTHER_C

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax Abstract
ComprehensiveIncomeNoteTextBlock	18.       CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME
	The following table summarizes the changes in accumulated other comprehensive income ("AOCI") for the three months ended September 30, 2013 (in millions):
		Cash Flow Hedge Activity		Defined Benefit Pension Plan Activity			OCI Valuation Allowance activity		Foreign Currency Translation Adjustment			Total
	Balance as of June 30, 2013, net of tax	$	-1	$	-270		$	-113	$	-15		$	-399
	Amounts classified into AOCI, net of tax		-1		-			-		15			14
	Amounts reclassified from AOCI, net of tax		1		2			-		-			3
	Change in AOCI, net of tax		-		2			-		15			17
	Balance as of September 30, 2013, net of tax	$	-1	$	-268		$	-113	$	-		$	-382
	The following table summarizes the changes in AOCI for the nine months ended September 30, 2013 (in millions):
		Cash Flow Hedge Activity		Defined Benefit Pension Plan Activity			OCI Valuation Allowance activity		Foreign Currency Translation Adjustment			Total
	Balance as of December 31, 2012, net of tax	$	-1	$	-279		$	-114	$	30		$	-364
	Amounts classified into AOCI, net of tax		-2		2			1		-30			-29
	Amounts reclassified from AOCI, net of tax		2		9			-		-			11
	Change in AOCI, net of tax		-		11			1		-30			-18
	Balance as of September 30, 2013, net of tax	$	-1	$	-268		$	-113	$	-		$	-382
	The following table presents the impact and respective location of AOCI reclassifications on the Consolidated Statements of Earnings, net of tax (in millions):
						Three Months Ended					Nine Months Ended
						Sep. 30,					Sep. 30,
				Location			2013				2013
	Cash Flow Hedge Activity			Cost of sales		$	1				$	2
	Defined Benefit Pension Plan Activity			Cost of sales			2					7
	Defined Benefit Pension Plan Activity			Marketing and administrative expenses			0					2
	Total reclassifications from AOCI					$	3				$	11

CONDENSED_CONSOLIDATED_FINANCI

CONDENSED CONSOLIDATED FINANCIAL STATEMENTS	3 Months Ended																														9 Months Ended																																				12 Months Ended
	Sep. 30, 2013															Sep. 30, 2012															Sep. 30, 2013																		Sep. 30, 2012																		Dec. 31, 2012
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	OWENS CORNING AND SUBSIDIARIES															OWENS CORNING AND SUBSIDIARIES															19.       CONDENSED CONSOLIDATING FINANCIAL STATEMENTS																		OWENS CORNING AND SUBSIDIARIES																		OWENS CORNING AND SUBSIDIARIES
	CONSOLIDATING STATEMENT OF EARNINGS															CONSOLIDATING STATEMENT OF EARNINGS																																	CONSOLIDATING STATEMENT OF EARNINGS																		CONDENSED CONSOLIDATING BALANCE SHEET
	FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2013															FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2012															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.																		FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012																		AS OF DECEMBER 31, 2012
	(in millions)															(in millions)															Guarantor and Nonguarantor Financial Statements																		(in millions)																		(in millions)
																															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”).
				Parent			Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated					Parent		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Consolidated																							Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			ASSETS				Parent			Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
	NET SALES			$	-		$	921	$	497	$	-98		$	1,320	NET SALES			$	-	$	895		$	485	$	-104		$	1,276	OWENS CORNING AND SUBSIDIARIES																		NET SALES			$	-		$	2,846		$	1,461		$	-294		$	4,013		CURRENT ASSETS
	COST OF SALES				-3			739		429		-98			1,067	COST OF SALES				-3		741			440		-104			1,074	CONSOLIDATING STATEMENT OF EARNINGS																		COST OF SALES				-			2,353			1,327			-294			3,386			Cash and cash equivalents			$	-		$	3	$	52	$	-	$	55
			Gross margin		3			182		68		-			253			Gross margin		3		154			45		-			202	FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2013																				Gross margin		-			493			134			-			627			Receivables, less allowances				-			-		600		-		600
	OPERATING EXPENSES				-			-					1			OPERATING EXPENSES				1		1			1		1				(in millions)																		OPERATING EXPENSES															1				Due from affiliates				-			2,528		-		-2,528		-
		Marketing and administrative expenses			25			68		35		-			128		Marketing and administrative expenses			24		58			33		-			115																				Marketing and administrative expenses			86			190			104			-			380			Inventories				-			473		313		-		786
		Science and technology expenses			-			13		6		-			19		Science and technology expenses			-		15			5		-			20				Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated				Science and technology expenses			-			47			13			-			60			Other current assets				5			75		96		-		176
		Charges related to cost reduction actions			-			-		6		-	1		6		Charges related to cost reduction actions			-	1	-			-		-			-	NET SALES			$	-		$	2,872		$	1,451		$	-306		$	4,017			Charges related to cost reduction actions			-			-			36			-			36					Total current assets		5			3,079		1,061		-2,528		1,617
		Other (income) expenses, net			-10			4		-		-			-6		Other (income) expenses, net			-6		24			-10		-			8	COST OF SALES				-7			2,340			1,257			-306			3,284			Other (income) expenses, net			-25			34			10			-			19		Investment in subsidiaries					6,877			2,489		558		-9,924		-
			Total operating expenses		15			85		47		-			147			Total operating expenses		18		97			28		-			143			Gross margin		7			532			194			-			733				Total operating expenses		61			271			163			-			495		Due from affiliates					-			65		1,022		-1,087		-
	EARNINGS BEFORE INTEREST AND TAXES				-12			97		21		-			106	EARNINGS BEFORE INTEREST AND TAXES				-15		57			17		-			59	OPERATING EXPENSES															1	-		EARNINGS BEFORE INTEREST AND TAXES				-61			222			-29			-			132		Property, plant and equipment, net					374			1,294		1,235		-		2,903
	Interest expense, net				27			-		2		-			29	Interest expense, net				27		-			2		-			29		Marketing and administrative expenses			89			202			104			-			395		Interest expense, net				76			2			7			-			85		Goodwill					-			1,068		75		-		1,143
	EARNINGS BEFORE TAXES				-39			97		19		-			77	EARNINGS BEFORE TAXES				-42		57			15		-			30		Science and technology expenses			-			43			14			-			57		EARNINGS BEFORE TAXES				-137			220			-36			-			47		Intangible assets					-			939		302		-196		1,045
	Less: Income tax expense (benefit)				-16			32		10		-			26	Less: Income tax expense (benefit)				-16		11			-9		-			-14		Charges related to cost reduction actions			-			-			8			-			8		Less: Income tax expense (benefit)				-52			56			4			-			8		Deferred income taxes					54			525		25		-		604
	Equity in net earnings of subsidiaries				74			9		-		-83			-	Equity in net earnings of subsidiaries				70		25			-		-95			-		Other (income) expenses, net			-17			-			9			-			-8		Equity in net earnings of subsidiaries				122			-41			-			-81			-		Other non-current assets					62			74		120		-		256
	Equity in net earnings of affiliates				-			-		-		-	1		-	Equity in net earnings of affiliates				-		-1			1		-			-			Total operating expenses		72			245			135			-			452		Equity in net earnings of affiliates				-			-1			1			-			-		TOTAL ASSETS				$	7,372		$	9,533	$	4,398	$	-13,735	$	7,568
	NET EARNINGS				51			74		9		-83			51	NET EARNINGS				44		70			25		-95			44	EARNINGS BEFORE INTEREST AND TAXES				-65			287			59			-			281		NET EARNINGS				37			122			-39			-81			39		LIABILITIES AND EQUITY
	Less: Net earnings attributable to noncontrolling interests				-			-		-		-	1		-	Less: Net earnings attributable to noncontrolling interests				-		-			-		-	1		-	Interest expense, net				81			1			5			-			87		Less: Net earnings attributable to noncontrolling interests				-			-			2			-			2		CURRENT LIABILITIES
	NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	51		$	74	$	9	$	-83		$	51	NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	44	$	70		$	25	$	-95		$	44	EARNINGS BEFORE TAXES				-146			286			54			-			194		NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	37		$	122		$	-41		$	-81		$	37			Accounts payable and accrued liabilities			$	8		$	620	$	279	$	-	$	907
	OWENS CORNING AND SUBSIDIARIES															OWENS CORNING AND SUBSIDIARIES															Less: Income tax expense (benefit)				-57			91			37			-			71		OWENS CORNING AND SUBSIDIARIES																			Due to affiliates				1,419			-		1,109		-2,528		-
	CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS															CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS															Equity in net earnings of subsidiaries				211			16			-			-227			-		CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS																			Short-term debt				-			-		5		-		5
	FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2013															FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2012															Equity in net earnings of affiliates				-			-			-			-	1		-		FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012																			Long-term debt – current portion				-			2		2		-		4
	(in millions)															(in millions)															NET EARNINGS				122			211			17			-227			123		(in millions)																					Total current liabilities		1,427			622		1,395		-2,528		916
																															Less: Net earnings attributable to noncontrolling interests				-			-			1			-			1																				Long-term debt, net of current portion					1,884			28		164		-		2,076
				Parent			Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated					Parent		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Consolidated		NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	122		$	211		$	16		$	-227		$	122					Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			Due to affiliates					-			1,022		65		-1,087		-
	NET EARNINGS			$	51		$	74	$	9	$	-83		$	51	NET EARNINGS			$	44	$	70		$	25	$	-95		$	44	OWENS CORNING AND SUBSIDIARIES																		NET EARNINGS			$	37		$	122		$	-39		$	-81		$	39		Pension plan liability					331			-		149		-		480
	Currency translation adjustment				15			-		-		-			15	Currency translation adjustment				28		-			-		-			28	CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS																		Currency translation adjustment				9			-			-			-			9		Other employee benefits liability					-			254		20		-		274
	Pension and other postretirement adjustment (net of tax)				2	0		-		-		-			2	Pension and other postretirement adjustment (net of tax)				-1		-	0.1		-		-			-1	FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2013																		Pension and other postretirement adjustment (net of tax)				-2			-	0.1		-			-			-2		Deferred income taxes					-			-		38		-		38
	Deferred income (loss) on hedging (net of tax)				-			-		-		-	1		-	Deferred income (loss) on hedging (net of tax)				2		-			-		-			2	(in millions)																		Deferred income (loss) on hedging (net of tax)				3			-			-			-			3		Other liabilities					192			172		41		-196		209
	COMPREHENSIVE EARNINGS				68			74		9		-83			68	COMPREHENSIVE EARNINGS				73		70			25		-95			73																			COMPREHENSIVE EARNINGS				47			122			-39			-81			49		OWENS CORNING STOCKHOLDERS’ EQUITY
	Less: Comprehensive earnings attributable to noncontrolling interests				-			-		-	1	-			-	Less: Comprehensive earnings attributable to noncontrolling interests				-	-1	-			-	1	-			-				Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			Less: Comprehensive earnings attributable to noncontrolling interests				-		0.1	-			2			-			2			Preferred stock				-	0		-		-		-		-
	COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	68		$	74	$	9	$	-83		$	68	COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	73	$	70		$	25	$	-95		$	73	NET EARNINGS			$	122		$	211		$	17		$	-227		$	123		COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	47		$	122		$	-41		$	-81		$	47			Common stock				1			-		-		-		1
																															Currency translation adjustment				-30			-			-			-			-30		OWENS CORNING AND SUBSIDIARIES																			Additional paid in capital				3,925			6,541		2,062		-8,603		3,925
																															Pension and other postretirement adjustment (net of tax)				11			-			-			-			11		CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS																			Accumulated earnings				451			894		427		-1,321		451
																															Deferred income (loss) on hedging (net of tax)				-			-			-			-	1		-		FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012																			Accumulated other comprehensive deficit				-364			-		-		-		-364
																															COMPREHENSIVE EARNINGS				103			211			17			-227			104		(in millions)																			Cost of common stock in treasury				-475			-		-		-		-475
																															Less: Comprehensive earnings attributable to noncontrolling interests				-			-			1			-			1																						Total Owens Corning stockholders’ equity			3,538			7,435		2,489		-9,924		3,538
																															COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	103		$	211		$	16		$	-227		$	103						Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			Noncontrolling interests				-			-		37		-		37
																															OWENS CORNING AND SUBSIDIARIES																		NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES				$	-64		$	37		$	120		$	-		$	93	Total equity					3,538			7,435		2,526		-9,924		3,575
																															CONDENSED CONSOLIDATING BALANCE SHEET																		NET CASH FLOW USED FOR INVESTING ACTIVITIES																		TOTAL LIABILITIES AND EQUITY				$	7,372		$	9,533	$	4,398	$	-13,735	$	7,568
																															AS OF SEPTEMBER 30, 2013																				Additions to plant and equipment			-22			-123			-90			-			-235
																															(in millions)																				Proceeds from the sale of affiliates			-			5			7			-			12
																																																				Net cash flow used for investing activities		-22			-118			-83			-			-223
																															ASSETS				Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated		NET CASH FLOW PROVIDED BY FINANCING ACTIVITIES
																															CURRENT ASSETS																				Proceeds from senior revolving credit and receivables securitization facilities			1,089			-			116			-			1,205
																																Cash and cash equivalents			$	1		$	4		$	46		$	-		$	51			Payments on senior revolving credit and receivables securitization facilities			-835			-			-94			-			-929
																																Receivables, less allowances				-			-			758			-			758			Payments on long-term debt			-4			-			-9			-			-13
																																Due from affiliates				-			2,726			-			-2,726			-			Net increase (decrease) in short-term debt			-8			-			-1			-			-9
																																Inventories				-			510			324			-			834			Purchases of noncontrolling interest			-			-22			-						-22
																																Other current assets				43			132			95			-			270			Purchase of treasury stock			-113			-			-			-			-113
																																		Total current assets		44			3,372			1,223			-2,726			1,913			Other intercompany loans			-52			103			-51			-			-
																															Investment in subsidiaries					7,105			2,405			558			-10,068			-			Other			9			-			-			-			9
																															Due from affiliates					-			66			966			-1,032			-				Net cash flow provided by financing activities		86			81			-39			-	.	.	128
																															Property, plant and equipment, net					359			1,293			1,253			-			2,905	Effect of exchange rate changes on cash					-			-			1			-			1
																															Goodwill					-			1,127			39			-			1,166	Net decrease in cash and cash equivalents					-			-			-1			-			-1
																															Intangible assets					-			1,017			283			-254			1,046	Cash and cash equivalents at beginning of period					-			-			52			-			52
																															Deferred income taxes					60			405			17			-			482	CASH AND CASH EQUIVALENTS AT END OF
																															Other non-current assets					20			68			127			-			215		PERIOD			$	-		$	-		$	51		$	-		$	51
																															TOTAL ASSETS				$	7,588		$	9,753		$	4,466		$	-14,080		$	7,727
																														LIABILITIES AND EQUITY
																														CURRENT LIABILITIES
																															Accounts payable and accrued liabilities			$	31		$	599		$	308		$	-		$	938
																															Due to affiliates				1,550			-			1,176			-2,726			-
																															Short-term debt				-			-			8			-			8
																															Long-term debt – current portion				-			2			1			-			3
																																	Total current liabilities		1,581			601			1,493			-2,726			949
																														Long-term debt, net of current portion					1,914			27			234			-			2,175
																														Due to affiliates					-			966			66			-1,032			-
																														Pension plan liability					313			-			139			-			452
																														Other employee benefits liability					-			247			18			-			265
																														Deferred income taxes					-			-			35			-			35
																														Other liabilities					165			249			40			-254			200
																														OWENS CORNING STOCKHOLDERS’ EQUITY
																															Preferred stock				-			-			-			-	1		-
																															Common stock				1			-			-			-			1
																															Additional paid in capital				3,961			6,558			1,962			-8,520			3,961
																															Accumulated earnings				573			1,105			443			-1,548			573
																															Accumulated other comprehensive deficit				-382			-			-			-			-382
																															Cost of common stock in treasury				-538			-			-			-			-538
																																Total Owens Corning stockholders’ equity			3,615			7,663			2,405			-10,068			3,615
																															Noncontrolling interests				-			-			36			-			36
																														Total equity					3,615			7,663			2,441			-10,068			3,651
																														TOTAL LIABILITIES AND EQUITY				$	7,588		$	9,753		$	4,466		$	-14,080		$	7,727
																														OWENS CORNING AND SUBSIDIARIES
																														CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
																														FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2013
																														(in millions)
																																	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
																														NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES				$	-63		$	105		$	121		$	-		$	163
																														NET CASH FLOW USED FOR INVESTING ACTIVITIES
																																Additions to plant and equipment			-5			-70			-124			-			-199
																																Investment in subsidiaries and affiliates, net of cash acquired			-			-51			-11			-			-62
																																Proceeds from Hurricane Sandy insurance claims			-			26			-						26
																																Proceeds from the sale of affiliates			-			-			17			-	1		17
																																Purchases of alloy			-			-			-15			-			-15
																																Proceeds from sale of alloy			16			-			-			-	1		16
																																	Net cash flow used for investing activities		11			-95			-133			-			-217
																														NET CASH FLOW PROVIDED BY FINANCING ACTIVITIES
																																Proceeds from senior revolving credit and receivables securitization facilities			940			-			123			-			1,063
																																Payments on senior revolving credit and receivables securitization facilities			-906			-			-51			-			-957
																																Payments on long-term debt			-			-			-1			-			-1
																																Net increase (decrease) in short-term debt			-			-			3			-			3
																																Purchases of treasury stock			-63			-			-			-			-63
																																Other intercompany loans			75			-9			-66			-			-
																																Other			7			-			-			-			7
																																	Net cash flow provided by financing activities		53			-9			8			-			52
																														Effect of exchange rate changes on cash					-			-			-2			-			-2
																														Net decrease in cash and cash equivalents					1			1			-6			-			-4
																														Cash and cash equivalents at beginning of period					-			3			52			-			55
																														CASH AND CASH EQUIVALENTS AT END OF
																															PERIOD			$	1		$	4		$	46		$	-		$	51

SEGMENT_INFORMATION_TABLE

SEGMENT INFORMATION (TABLE)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]			Three Months Ended				Nine Months Ended
			Sep. 30,				Sep. 30,
			2013		2012		2013		2012
	Reportable Segments
	Composites		$	453	$	459	$	1,384	$	1,433
	Building Materials			902		855		2,762		2,719
		Total reportable segments		1,355		1,314		4,146		4,152
	Corporate eliminations			-35		-38		-129		-139
	NET SALES		$	1,320	$	1,276	$	4,017	$	4,013
Schedule of Revenues by Geographical Areas [Table Text Block]
	External Customer Sales by Geographic Region
	United States		$	909	$	856	$	2,797	$	2,755
	Europe			135		133		412		431
	Asia Pacific			156		165		455		477
	Other			120		122		353		350
	NET SALES		$	1,320	$	1,276	$	4,017	$	4,013
Reconciliation of Revenue from Product Groups to Consolidated [Table Text Block]	Sales by Product Group
	Composites		$	453	$	459	$	1,384	$	1,433
	Insulation			431		384		1,176		1,055
	Roofing			471		471		1,586		1,664
	Corporate Eliminations			-35		-38		-129		-139
	NET SALES		$	1,320	$	1,276	$	4,017	$	4,013
Schedule of Earnings before Interest and Taxes [Table Text Block]	The following table summarizes EBIT by segment (in millions):
			Three Months Ended				Nine Months Ended
			Sep. 30,				Sep. 30,
			2013		2012		2013		2012
	Reportable Segments
	Composites		$	21	$	11	$	62	$	68
	Building Materials			114		86		332		242
		Total reportable segments	$	135	$	97	$	394	$	310
	Corporate, Other and Eliminations
	Charges related to cost reduction actions and related items (a)		$	-11	$	-22	$	-23	$	-109
	Losses related to Hurricane Sandy			-2		-		-16		-
	General corporate expense and other			-16		-16		-74		-69
	EBIT		$	106	$	59	$	281	$	132

INVENTORIES_TABLE

INVENTORIES (TABLE)	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]
Schedule of Inventory Current [Table Text Block]	3. INVENTORIES
	Inventories consist of the following (in millions):
		Sep. 30,		Dec. 31,
		2013		2012
	Finished goods	$	584	$	554
	Materials and supplies		250		232
	Total inventories	$	834	$	786

DERIVATIVE_FINANCIAL_INSTRUMEN1

DERIVATIVE FINANCIAL INSTRUMENTS (TABLE)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Assets and Liabilities at Fair Value [Table Text Block]	The following table presents the fair value of derivatives and hedging instruments and the respective location on the Consolidated Balance Sheets (in millions):
						Fair Value at
						Sep. 30,			Dec. 31,
				Location		2013			2012
	Derivative liabilities designated as hedging instruments:
	Cash flow hedges:
				Accounts payable and
		Natural gas and electricity			accrued liabilities	$	1		$	1
		Amount of loss recognized in OCI (effective portion)		OCI		$	1		$	1
	Fair value hedges:
			1	Accounts payable and
		Interest rate swaps	1		accrued liabilities	$	1		$	-
	Derivative assets not designated as hedging instruments:
		Foreign exchange contracts		Other current assets		$	1		$	1
	Derivative liabilities not designated as hedging instruments:
				Accounts payable and
		Foreign exchange contracts			accrued liabilities	$	1		$	3
Schedule of Fair Value Derivative Instruments Statements of Earnings Location [Table Text Block]	The following table presents the impact and respective location of derivative activities on the Consolidated Statements of Earnings (in millions):
							Three Months Ended					Nine Months Ended
							Sep. 30,					Sep. 30,
					Location		2013			2012		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		$	1	$	-	$	6
	Interest rate swaps:
		Amount of loss recognized in earnings			Interest expense		$	-		$	-	$	-	$	-
	Derivative activity not designated as hedging instruments:
	Natural gas and electricity:
		Amount of (gain) recognized in earnings			Other (income) expenses, net		$	-		$	-	$	-	$	-1
	Foreign currency exchange contract:
		Amount of loss recognized in earnings (a)			Other (income) expenses, net		$	1		$	1	$	12	$	5
	(a)	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 expenses.

GOODWILL_AND_OTHER_INTANGIBLE_1

GOODWILL AND OTHER INTANGIBLE ASSETS (TABLE)	9 Months Ended										12 Months Ended
	Sep. 30, 2013										Dec. 31, 2012
Goodwill and Other Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	5. GOODWILL AND OTHER INTANGIBLE ASSETS
											Dec. 31, 2012			Weighted Average Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	Intangible assets and goodwill consist of the following (in millions):										Amortizable intangible assets:
												Customer relationships		19	$	169	$	-58	$	111
												Technology		20		198		-64		134
	Sep. 30, 2013			Weighted Average Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount			Franchise and other agreements		14		37		-14		23
	Amortizable intangible assets:										Indefinite-lived intangible assets:
		Customer relationships		18	$	180	$	-65	$	115		Trademarks				777		-		777
		Technology		20		196		-71		125			Total intangible assets		$	1,181	$	-136	$	1,045
		Franchise and other agreements		14		36		-16		20	Goodwill				$	1,143
	Indefinite-lived intangible assets:
		Trademarks				786		-		786
			Total intangible assets		$	1,198	$	-152	$	1,046
	Goodwill				$	1,166
Schedule of Goodwill [Table Text Block]	The changes in the net carrying amount of goodwill by segment are as follows (in millions):
			Composites		Building Materials			Total
	Balance as of December 31, 2012		$	56	$	1,087	$	1,143
	Acquisitions (see Note 7)			2		22		24
	Foreign currency adjustments			-1		0		-1
	Balance as of September 30, 2013		$	57	$	1,109	$	1,166

PROPERTY_PLANT_AND_EQUIPMENT_T

PROPERTY, PLANT AND EQUIPMENT (TABLE)	9 Months Ended
	Sep. 30, 2013
Property, Plant And Equipment [Abstract]
Property Plant And Equipment Text Block	Property, plant and equipment consist of the following (in millions):
		Sep. 30,		Dec. 31,
		2013		2012
	Land	$	222	$	222
	Buildings and leasehold improvements		817		789
	Machinery and equipment		3,302		3,223
	Construction in progress		202		147
			4,543		4,381
	Accumulated depreciation		-1,638		-1,478
	Property, plant and equipment, net	$	2,905	$	2,903

WARRANTIES_TABLE

WARRANTIES (TABLE)	9 Months Ended
	Sep. 30, 2013
Warranties [Abstract]
Schedule of Product Warranty Liability [Table Text Block]	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):
				Nine Months Ended
				Sep. 30, 2013
	Beginning balance		$	41
		Amounts accrued for current year		18
		Settlements of warranty claims		-18
	Ending balance		$	41

COST_REDUCTION_ACTIONS_TABLE

COST REDUCTION ACTIONS (TABLE)	9 Months Ended
	Sep. 30, 2013
Cost Reduction Actions 2012 [Member]
Restructuring Cost and Reserve [Line Items]
Schedule Of Restructuring Reserve By Type Of Cost Text Block	The following table summarizes the status of the unpaid liabilities from the Company's 2012 cost reduction actions (in millions):
		Beginning Balance Dec. 31, 2012		Costs Incurred		Payments		Ending Balance Sep. 30, 2013		Cumulative Charges Incurred
	Severance	$	45	$	2	$	15	$	32	$	53
	Total	$	45	$	2	$	15	$	32	$	53
Cost Reduction Actions 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Schedule Of Restructuring Reserve By Type Of Cost Text Block	The following table summarizes the status of the unpaid liabilities from the Company's 2013 cost reduction actions (in millions):
		Beginning Balance Dec. 31, 2012		Costs Incurred		Payments		Ending Balance Sep. 30, 2013		Cumulative Charges Incurred
	Severance	$	-	$	6	$	-	$	6	$	6
	Total	$	-	$	6	$	-	$	6	$	6

DEBT_TABLE

DEBT (TABLE)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	11. DEBT
	Details of the Company's outstanding long-term debt are as follows (in millions):
			Sep. 30,		Dec. 31,
			2013		2012
	6.50% senior notes, net of discount, due 2016		$	400	$	400
	9.00% senior notes, net of discount, due 2019			248		247
	4.20% senior notes, net of discount, due 2022			599		599
	7.00% senior notes, net of discount, due 2036			540		540
	Accounts receivable securitization facility, maturing in 2016			212		141
	Senior revolving credit facility, maturing in 2016			108		73
	Various capital leases, due through and beyond 2050			50		52
	Various floating rate debt, maturing through 2027			1		2
	Fair value adjustment to debt			20		26
	Total long-term debt			2,178		2,080
	Less – current portion			3		4
		Long-term debt, net of current portion	$	2,175	$	2,076

PENSION_AND_OTHER_POSTRETIREME

PENSION AND OTHER POSTRETIREMENT BENEFITS (TABLE)	9 Months Ended
	Sep. 30, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	The following tables provide information regarding pension expense recognized (in millions):
		Three Months Ended						Three Months Ended
		Sep. 30, 2013						Sep. 30, 2012
		U.S.		Non-U.S.		Total		U.S.		Non-U.S.		Total
	Components of Net Periodic Pension Cost
	Service cost	$	2	$	-	$	2	$	3	$	1	$	4
	Interest cost		11		5		16		12		5		17
	Expected return on plan assets		-14		-7		-21		-15		-7		-22
	Amortization of actuarial loss		4		1		5		6		2		8
	Net periodic pension cost	$	3	$	-1	$	2	$	6	$	1	$	7
		Nine Months Ended						Nine Months Ended
		Sep. 30, 2013						Sep. 30, 2012
		U.S.		Non-U.S.		Total		U.S.		Non-U.S.		Total
	Components of Net Periodic Pension Cost
	Service cost	$	7	$	4	$	11	$	7	$	5	$	12
	Interest cost		33		16		49		37		17		54
	Expected return on plan assets		-44		-19		-63		-45		-20		-65
	Amortization of actuarial loss		11		4		15		18		4		22
	Net periodic pension cost	$	7	$	5	$	12	$	17	$	6	$	23
Other Postretirement Benefits Other Than Pensions [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	The following table provides the components of net periodic benefit cost for aggregated United States and non-United States Plans for the periods indicated (in millions):
		Three Months Ended				Nine Months Ended
		Sep. 30,				Sep. 30,
		2013		2012		2013		2012
	Components of Net Periodic Benefit Cost
	Service cost	$	1	$	1	$	2	$	2
	Interest cost		2		2		7		8
	Amortization of prior service cost		-1		-1		-3		-3
	Amortization of actuarial gain		-1		-1		-1		-2
	Net periodic benefit cost	$	1	$	1	$	5	$	5

STOCK_COMPENSATION_TABLE

STOCK COMPENSATION (TABLE)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	The following table summarizes the Company's stock option activity for the nine months ended Sep. 30, 2013:
													Nine Months Ended
													Sep. 30 2013
													Number of Options	Weighted-Average Exercise Price
	Beginning Balance												3,025,220	$	27.78
	Granted												329,800		42.16
	Exercised												-540,725		26.96
	Forfeited												-56,500		34.58
	Ending Balance												2,757,795	$	29.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
	The following table summarizes information about the Company's options outstanding and exercisable:
			Options Outstanding								Options Exercisable
						Weighted-Average							Weighted-Average
	Range of Exercise Prices		Options Outstanding			Remaining Contractual Life	Exercise Price		Number Exercisable at Sep. 30, 2013			Remaining Contractual Life		Exercise Price
	$13.89- $42.16		2,757,795			5.6	$	29.52		1,948,220			4.45	$	26.73
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]		Nine Months Ended
		Sep. 30, 2013
		Number of Shares		Weighted-Average Grant-Date Fair Value
	Beginning Balance	1,875,065		$	27.14
	Granted	497,694			41.13
	Vested	-602,501			25.92
	Forfeited	-75,869			34.54
	Ending Balance	1,694,389		$	31.35
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Table Text Block]		Nine Months Ended
		Sep. 30, 2013
		Number of PSUs		Weighted-Average Grant-Date Fair Value
	Beginning Balance	412,910		$	49.14
	Granted	207,050			56.71
	Forfeited	-40,550			50.36
	Ending Balance	579,410		$	51.76

COMPREHENSIVE_EARNINGS_TABLE

COMPREHENSIVE EARNINGS (TABLE)	9 Months Ended
	Sep. 30, 2013
Comprehensive deficit:
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the changes in accumulated other comprehensive income ("AOCI") for the three months ended September 30, 2013 (in millions):
		Cash Flow Hedge Activity		Defined Benefit Pension Plan Activity			OCI Valuation Allowance activity		Foreign Currency Translation Adjustment			Total
	Balance as of June 30, 2013, net of tax	$	-1	$	-270		$	-113	$	-15		$	-399
	Amounts classified into AOCI, net of tax		-1		-			-		15			14
	Amounts reclassified from AOCI, net of tax		1		2			-		-			3
	Change in AOCI, net of tax		-		2			-		15			17
	Balance as of September 30, 2013, net of tax	$	-1	$	-268		$	-113	$	-		$	-382
	The following table summarizes the changes in AOCI for the nine months ended September 30, 2013 (in millions):
		Cash Flow Hedge Activity		Defined Benefit Pension Plan Activity			OCI Valuation Allowance activity		Foreign Currency Translation Adjustment			Total
	Balance as of December 31, 2012, net of tax	$	-1	$	-279		$	-114	$	30		$	-364
	Amounts classified into AOCI, net of tax		-2		2			1		-30			-29
	Amounts reclassified from AOCI, net of tax		2		9			-		-			11
	Change in AOCI, net of tax		-		11			1		-30			-18
	Balance as of September 30, 2013, net of tax	$	-1	$	-268		$	-113	$	-		$	-382
	The following table presents the impact and respective location of AOCI reclassifications on the Consolidated Statements of Earnings, net of tax (in millions):
						Three Months Ended					Nine Months Ended
						Sep. 30,					Sep. 30,
				Location			2013				2013
	Cash Flow Hedge Activity			Cost of sales		$	1				$	2
	Defined Benefit Pension Plan Activity			Cost of sales			2					7
	Defined Benefit Pension Plan Activity			Marketing and administrative expenses			0					2
	Total reclassifications from AOCI					$	3				$	11

EARNINGS_PER_SHARE_TABLE

EARNINGS PER SHARE (TABLE)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share Abstract
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	15. EARNINGS PER SHARE
	The following table summarizes the number of shares outstanding as well as our basic and diluted earnings per-share (in millions, except per share amounts):
				Three Months Ended				Nine Months Ended
				Sep. 30,				Sep. 30,
			2013		2012		2013		2012
	Net earnings attributable to Owens Corning		$	51	$	44	$	122	$	37
	Weighted-average number of shares outstanding used for
		basic earnings per share		118		117.9		118.4		119.8
	Non-vested restricted and performance shares			0.4		0.6		0.4		0.5
	Options to purchase common stock			0.4		0.3		0.5		0.3
	Weighted-average number of shares outstanding and common
		equivalent shares used for diluted earnings per share		118.8		118.8		119.3		120.6
	Earnings per common share attributable to Owens Corning
		common stockholders:
		Basic	$	0.43	$	0.37	$	1.03	$	0.31
		Diluted	$	0.43	$	0.37	$	1.02	$	0.31

FAIR_VALUE_MEASUREMENT_TABLE

FAIR VALUE MEASUREMENT (TABLE)	9 Months Ended									12 Months Ended
	Sep. 30, 2013									Dec. 31, 2012
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	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 September 30, 2013 (in millions):									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, 2012 (in millions):
			Total Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Assets:									Assets:
	Cash equivalents	$	18	$	18	$	-	$	-	Cash equivalents	$	1	$	1	$	-	$	-
	Term deposits		2		-		2		-	Term deposits		1		-		1		-
	Derivative assets		1		-		1		-	Derivative assets		1		-		1		-
	Total assets	$	21	$	18	$	3	$	-	Total assets	$	3	$	1	$	2	$	-
	Liabilities:									Liabilities:
	Derivative liabilities	$	-3	$	-	$	-3	$	-	Derivative liabilities	$	-4	$	-	$	-4	$	-
	Total liabilities	$	-3	$	-	$	-3	$	-	Total liabilities	$	-4	$	-	$	-4	$	-

CHANGES_IN_ACCUMULATED_OTHER_C1

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (TABLE)	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax Abstract
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the changes in accumulated other comprehensive income ("AOCI") for the three months ended September 30, 2013 (in millions):
		Cash Flow Hedge Activity		Defined Benefit Pension Plan Activity			OCI Valuation Allowance activity		Foreign Currency Translation Adjustment			Total
	Balance as of June 30, 2013, net of tax	$	-1	$	-270		$	-113	$	-15		$	-399
	Amounts classified into AOCI, net of tax		-1		-			-		15			14
	Amounts reclassified from AOCI, net of tax		1		2			-		-			3
	Change in AOCI, net of tax		-		2			-		15			17
	Balance as of September 30, 2013, net of tax	$	-1	$	-268		$	-113	$	-		$	-382
	The following table summarizes the changes in AOCI for the nine months ended September 30, 2013 (in millions):
		Cash Flow Hedge Activity		Defined Benefit Pension Plan Activity			OCI Valuation Allowance activity		Foreign Currency Translation Adjustment			Total
	Balance as of December 31, 2012, net of tax	$	-1	$	-279		$	-114	$	30		$	-364
	Amounts classified into AOCI, net of tax		-2		2			1		-30			-29
	Amounts reclassified from AOCI, net of tax		2		9			-		-			11
	Change in AOCI, net of tax		-		11			1		-30			-18
	Balance as of September 30, 2013, net of tax	$	-1	$	-268		$	-113	$	-		$	-382
	The following table presents the impact and respective location of AOCI reclassifications on the Consolidated Statements of Earnings, net of tax (in millions):
						Three Months Ended					Nine Months Ended
						Sep. 30,					Sep. 30,
				Location			2013				2013
	Cash Flow Hedge Activity			Cost of sales		$	1				$	2
	Defined Benefit Pension Plan Activity			Cost of sales			2					7
	Defined Benefit Pension Plan Activity			Marketing and administrative expenses			0					2
	Total reclassifications from AOCI					$	3				$	11

CONDENSED_CONSOLIDATING_FINANC

CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (TABLE)	3 Months Ended																														9 Months Ended																																				12 Months Ended
	Sep. 30, 2013															Sep. 30, 2012															Sep. 30, 2013																		Sep. 30, 2012																		Dec. 31, 2012
Condensed Financial Information of Consolidating Company Disclosure [Abstract]
Condensed Consolidating Statement of Earnings [Table Text Block]	OWENS CORNING AND SUBSIDIARIES															OWENS CORNING AND SUBSIDIARIES															OWENS CORNING AND SUBSIDIARIES																		OWENS CORNING AND SUBSIDIARIES
	CONSOLIDATING STATEMENT OF EARNINGS															CONSOLIDATING STATEMENT OF EARNINGS															CONSOLIDATING STATEMENT OF EARNINGS																		CONSOLIDATING STATEMENT OF EARNINGS
	FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2013															FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2012															FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2013																		FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012
	(in millions)															(in millions)															(in millions)																		(in millions)
			Parent			Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated				Parent		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Consolidated				Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated					Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	NET SALES			$	-		$	921	$	497	$	-98		$	1,320	NET SALES			$	-	$	895		$	485	$	-104		$	1,276	NET SALES			$	-		$	2,872		$	1,451		$	-306		$	4,017		NET SALES			$	-		$	2,846		$	1,461		$	-294		$	4,013
	COST OF SALES				-3			739		429		-98			1,067	COST OF SALES				-3		741			440		-104			1,074	COST OF SALES				-7			2,340			1,257			-306			3,284		COST OF SALES				-			2,353			1,327			-294			3,386
			Gross margin		3			182		68		-			253			Gross margin		3		154			45		-			202			Gross margin		7			532			194			-			733				Gross margin		-			493			134			-			627
	OPERATING EXPENSES				-			-					1			OPERATING EXPENSES				1		1			1		1				OPERATING EXPENSES															1	-		OPERATING EXPENSES															1
		Marketing and administrative expenses			25			68		35		-			128		Marketing and administrative expenses			24		58			33		-			115		Marketing and administrative expenses			89			202			104			-			395			Marketing and administrative expenses			86			190			104			-			380
		Science and technology expenses			-			13		6		-			19		Science and technology expenses			-		15			5		-			20		Science and technology expenses			-			43			14			-			57			Science and technology expenses			-			47			13			-			60
		Charges related to cost reduction actions			-			-		6		-	1		6		Charges related to cost reduction actions			-	1	-			-		-			-		Charges related to cost reduction actions			-			-			8			-			8			Charges related to cost reduction actions			-			-			36			-			36
		Other (income) expenses, net			-10			4		-		-			-6		Other (income) expenses, net			-6		24			-10		-			8		Other (income) expenses, net			-17			-			9			-			-8			Other (income) expenses, net			-25			34			10			-			19
			Total operating expenses		15			85		47		-			147			Total operating expenses		18		97			28		-			143			Total operating expenses		72			245			135			-			452				Total operating expenses		61			271			163			-			495
	EARNINGS BEFORE INTEREST AND TAXES				-12			97		21		-			106	EARNINGS BEFORE INTEREST AND TAXES				-15		57			17		-			59	EARNINGS BEFORE INTEREST AND TAXES				-65			287			59			-			281		EARNINGS BEFORE INTEREST AND TAXES				-61			222			-29			-			132
	Interest expense, net				27			-		2		-			29	Interest expense, net				27		-			2		-			29	Interest expense, net				81			1			5			-			87		Interest expense, net				76			2			7			-			85
	EARNINGS BEFORE TAXES				-39			97		19		-			77	EARNINGS BEFORE TAXES				-42		57			15		-			30	EARNINGS BEFORE TAXES				-146			286			54			-			194		EARNINGS BEFORE TAXES				-137			220			-36			-			47
	Less: Income tax expense (benefit)				-16			32		10		-			26	Less: Income tax expense (benefit)				-16		11			-9		-			-14	Less: Income tax expense (benefit)				-57			91			37			-			71		Less: Income tax expense (benefit)				-52			56			4			-			8
	Equity in net earnings of subsidiaries				74			9		-		-83			-	Equity in net earnings of subsidiaries				70		25			-		-95			-	Equity in net earnings of subsidiaries				211			16			-			-227			-		Equity in net earnings of subsidiaries				122			-41			-			-81			-
	Equity in net earnings of affiliates				-			-		-		-	1		-	Equity in net earnings of affiliates				-		-1			1		-			-	Equity in net earnings of affiliates				-			-			-			-	1		-		Equity in net earnings of affiliates				-			-1			1			-			-
	NET EARNINGS				51			74		9		-83			51	NET EARNINGS				44		70			25		-95			44	NET EARNINGS				122			211			17			-227			123		NET EARNINGS				37			122			-39			-81			39
	Less: Net earnings attributable to noncontrolling interests				-			-		-		-	1		-	Less: Net earnings attributable to noncontrolling interests				-		-			-		-	1		-	Less: Net earnings attributable to noncontrolling interests				-			-			1			-			1		Less: Net earnings attributable to noncontrolling interests				-			-			2			-			2
	NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	51		$	74	$	9	$	-83		$	51	NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	44	$	70		$	25	$	-95		$	44	NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	122		$	211		$	16		$	-227		$	122		NET EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	37		$	122		$	-41		$	-81		$	37
Condensed Consolidating Statement Of Comprehensive Earnings [Table Text Block]	OWENS CORNING AND SUBSIDIARIES															OWENS CORNING AND SUBSIDIARIES															OWENS CORNING AND SUBSIDIARIES																		OWENS CORNING AND SUBSIDIARIES
	CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS															CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS															CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS																		CONSOLIDATING STATEMENT OF COMPREHENSIVE EARNINGS
	FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2013															FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2012															FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2013																		FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012
	(in millions)															(in millions)															(in millions)																		(in millions)
			Parent			Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated				Parent		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Consolidated				Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated					Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	NET EARNINGS			$	51		$	74	$	9	$	-83		$	51	NET EARNINGS			$	44	$	70		$	25	$	-95		$	44	NET EARNINGS			$	122		$	211		$	17		$	-227		$	123		NET EARNINGS			$	37		$	122		$	-39		$	-81		$	39
	Currency translation adjustment				15			-		-		-			15	Currency translation adjustment				28		-			-		-			28	Currency translation adjustment				-30			-			-			-			-30		Currency translation adjustment				9			-			-			-			9
	Pension and other postretirement adjustment (net of tax)				2	0		-		-		-			2	Pension and other postretirement adjustment (net of tax)				-1		-	0.1		-		-			-1	Pension and other postretirement adjustment (net of tax)				11			-			-			-			11		Pension and other postretirement adjustment (net of tax)				-2			-	0.1		-			-			-2
	Deferred income (loss) on hedging (net of tax)				-			-		-		-	1		-	Deferred income (loss) on hedging (net of tax)				2		-			-		-			2	Deferred income (loss) on hedging (net of tax)				-			-			-			-	1		-		Deferred income (loss) on hedging (net of tax)				3			-			-			-			3
	COMPREHENSIVE EARNINGS				68			74		9		-83			68	COMPREHENSIVE EARNINGS				73		70			25		-95			73	COMPREHENSIVE EARNINGS				103			211			17			-227			104		COMPREHENSIVE EARNINGS				47			122			-39			-81			49
	Less: Comprehensive earnings attributable to noncontrolling interests				-			-		-	1	-			-	Less: Comprehensive earnings attributable to noncontrolling interests				-	-1	-			-	1	-			-	Less: Comprehensive earnings attributable to noncontrolling interests				-			-			1			-			1		Less: Comprehensive earnings attributable to noncontrolling interests				-		0.1	-			2			-			2
	COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	68		$	74	$	9	$	-83		$	68	COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	73	$	70		$	25	$	-95		$	73	COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	103		$	211		$	16		$	-227		$	103		COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING			$	47		$	122		$	-41		$	-81		$	47
Condensed Consolidating Balance Sheet [Table Text Block]																															OWENS CORNING AND SUBSIDIARIES																																				OWENS CORNING AND SUBSIDIARIES
																															CONDENSED CONSOLIDATING BALANCE SHEET																																				CONDENSED CONSOLIDATING BALANCE SHEET
																															AS OF SEPTEMBER 30, 2013																																				AS OF DECEMBER 31, 2012
																															(in millions)																																				(in millions)
																															ASSETS				Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated																				ASSETS				Parent			Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
																															CURRENT ASSETS																																				CURRENT ASSETS
																																Cash and cash equivalents			$	1		$	4		$	46		$	-		$	51																				Cash and cash equivalents			$	-		$	3	$	52	$	-	$	55
																																Receivables, less allowances				-			-			758			-			758																				Receivables, less allowances				-			-		600		-		600
																																Due from affiliates				-			2,726			-			-2,726			-																				Due from affiliates				-			2,528		-		-2,528		-
																																Inventories				-			510			324			-			834																				Inventories				-			473		313		-		786
																																Other current assets				43			132			95			-			270																				Other current assets				5			75		96		-		176
																																		Total current assets		44			3,372			1,223			-2,726			1,913																						Total current assets		5			3,079		1,061		-2,528		1,617
																															Investment in subsidiaries					7,105			2,405			558			-10,068			-																			Investment in subsidiaries					6,877			2,489		558		-9,924		-
																															Due from affiliates					-			66			966			-1,032			-																			Due from affiliates					-			65		1,022		-1,087		-
																															Property, plant and equipment, net					359			1,293			1,253			-			2,905																			Property, plant and equipment, net					374			1,294		1,235		-		2,903
																															Goodwill					-			1,127			39			-			1,166																			Goodwill					-			1,068		75		-		1,143
																															Intangible assets					-			1,017			283			-254			1,046																			Intangible assets					-			939		302		-196		1,045
																															Deferred income taxes					60			405			17			-			482																			Deferred income taxes					54			525		25		-		604
																															Other non-current assets					20			68			127			-			215																			Other non-current assets					62			74		120		-		256
																															TOTAL ASSETS				$	7,588		$	9,753		$	4,466		$	-14,080		$	7,727																			TOTAL ASSETS				$	7,372		$	9,533	$	4,398	$	-13,735	$	7,568
																															LIABILITIES AND EQUITY																																				LIABILITIES AND EQUITY
																															CURRENT LIABILITIES																																				CURRENT LIABILITIES
																																Accounts payable and accrued liabilities			$	31		$	599		$	308		$	-		$	938																				Accounts payable and accrued liabilities			$	8		$	620	$	279	$	-	$	907
																																Due to affiliates				1,550			-			1,176			-2,726			-																				Due to affiliates				1,419			-		1,109		-2,528		-
																																Short-term debt				-			-			8			-			8																				Short-term debt				-			-		5		-		5
																																Long-term debt – current portion				-			2			1			-			3																				Long-term debt – current portion				-			2		2		-		4
																																		Total current liabilities		1,581			601			1,493			-2,726			949																						Total current liabilities		1,427			622		1,395		-2,528		916
																															Long-term debt, net of current portion					1,914			27			234			-			2,175																			Long-term debt, net of current portion					1,884			28		164		-		2,076
																															Due to affiliates					-			966			66			-1,032			-																			Due to affiliates					-			1,022		65		-1,087		-
																															Pension plan liability					313			-			139			-			452																			Pension plan liability					331			-		149		-		480
																															Other employee benefits liability					-			247			18			-			265																			Other employee benefits liability					-			254		20		-		274
																															Deferred income taxes					-			-			35			-			35																			Deferred income taxes					-			-		38		-		38
																															Other liabilities					165			249			40			-254			200																			Other liabilities					192			172		41		-196		209
																															OWENS CORNING STOCKHOLDERS’ EQUITY																																				OWENS CORNING STOCKHOLDERS’ EQUITY
																																Preferred stock				-			-			-			-	1		-																				Preferred stock				-	0		-		-		-		-
																																Common stock				1			-			-			-			1																				Common stock				1			-		-		-		1
																																Additional paid in capital				3,961			6,558			1,962			-8,520			3,961																				Additional paid in capital				3,925			6,541		2,062		-8,603		3,925
																																Accumulated earnings				573			1,105			443			-1,548			573																				Accumulated earnings				451			894		427		-1,321		451
																																Accumulated other comprehensive deficit				-382			-			-			-			-382																				Accumulated other comprehensive deficit				-364			-		-		-		-364
																																Cost of common stock in treasury				-538			-			-			-			-538																				Cost of common stock in treasury				-475			-		-		-		-475
																																	Total Owens Corning stockholders’ equity			3,615			7,663			2,405			-10,068			3,615																					Total Owens Corning stockholders’ equity			3,538			7,435		2,489		-9,924		3,538
																																Noncontrolling interests				-			-			36			-			36																				Noncontrolling interests				-			-		37		-		37
																															Total equity					3,615			7,663			2,441			-10,068			3,651																			Total equity					3,538			7,435		2,526		-9,924		3,575
																															TOTAL LIABILITIES AND EQUITY				$	7,588		$	9,753		$	4,466		$	-14,080		$	7,727																			TOTAL LIABILITIES AND EQUITY				$	7,372		$	9,533	$	4,398	$	-13,735	$	7,568
Condensed Consolidating Statement of Cash Flows [Table Text Block]																															OWENS CORNING AND SUBSIDIARIES																		OWENS CORNING AND SUBSIDIARIES
																															CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS																		CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
																															FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2013																		FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012
																															(in millions)																		(in millions)
																																		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated						Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
																															NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES				$	-63		$	105		$	121		$	-		$	163	NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES				$	-64		$	37		$	120		$	-		$	93
																															NET CASH FLOW USED FOR INVESTING ACTIVITIES																		NET CASH FLOW USED FOR INVESTING ACTIVITIES
																																	Additions to plant and equipment			-5			-70			-124			-			-199			Additions to plant and equipment			-22			-123			-90			-			-235
																																	Investment in subsidiaries and affiliates, net of cash acquired			-			-51			-11			-			-62			Proceeds from the sale of affiliates			-			5			7			-			12
																																	Proceeds from Hurricane Sandy insurance claims			-			26			-						26				Net cash flow used for investing activities		-22			-118			-83			-			-223
																																	Proceeds from the sale of affiliates			-			-			17			-	1		17	NET CASH FLOW PROVIDED BY FINANCING ACTIVITIES
																																	Purchases of alloy			-			-			-15			-			-15			Proceeds from senior revolving credit and receivables securitization facilities			1,089			-			116			-			1,205
																																	Proceeds from sale of alloy			16			-			-			-	1		16			Payments on senior revolving credit and receivables securitization facilities			-835			-			-94			-			-929
																																		Net cash flow used for investing activities		11			-95			-133			-			-217			Payments on long-term debt			-4			-			-9			-			-13
																															NET CASH FLOW PROVIDED BY FINANCING ACTIVITIES																				Net increase (decrease) in short-term debt			-8			-			-1			-			-9
																																	Proceeds from senior revolving credit and receivables securitization facilities			940			-			123			-			1,063			Purchases of noncontrolling interest			-			-22			-						-22
																																	Payments on senior revolving credit and receivables securitization facilities			-906			-			-51			-			-957			Purchase of treasury stock			-113			-			-			-			-113
																																	Payments on long-term debt			-			-			-1			-			-1			Other intercompany loans			-52			103			-51			-			-
																																	Net increase (decrease) in short-term debt			-			-			3			-			3			Other			9			-			-			-			9
																																	Purchases of treasury stock			-63			-			-			-			-63				Net cash flow provided by financing activities		86			81			-39			-	.	.	128
																																	Other intercompany loans			75			-9			-66			-			-	Effect of exchange rate changes on cash					-			-			1			-			1
																																	Other			7			-			-			-			7	Net decrease in cash and cash equivalents					-			-			-1			-			-1
																																		Net cash flow provided by financing activities		53			-9			8			-			52	Cash and cash equivalents at beginning of period					-			-			52			-			52
																															Effect of exchange rate changes on cash					-			-			-2			-			-2	CASH AND CASH EQUIVALENTS AT END OF
																															Net decrease in cash and cash equivalents					1			1			-6			-			-4		PERIOD			$	-		$	-		$	51		$	-		$	51
																															Cash and cash equivalents at beginning of period					-			3			52			-			55
																															CASH AND CASH EQUIVALENTS AT END OF
																																PERIOD			$	1		$	4		$	46		$	-		$	51

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENT OF EARNINGS (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements Captions [Line Items]
NET SALES	$1,320	$1,276	$4,017	$4,013
COST OF SALES	1,067	1,074	3,284	3,386
Gross margin	253	202	733	627
OPERATING EXPENSES
Marketing and administrative expenses	128	115	395	380
Science and technology expenses	19	20	57	60
Charges related to cost reduction actions	6	0	8	36
Other Expenses, net	-6	8	-8	19
Total operating expenses	147	143	452	495
Earnings Before Interest And Taxes	106	59	281	132
Interest expense, net	29	29	87	85
EARNINGS BEFORE TAXES	77	30	194	47
Income Tax Expense (Benefit)	-26	14	-71	-8
Equity in net earnings of affiliates	0	0	0	0
NET EARNINGS	51	44	123	39
Less: Net earnings attributable to noncontrolling interests	0	0	1	2
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	51	44	122	37
Parent Company Member
Condensed Financial Statements Captions [Line Items]
NET SALES	0	0	0	0
COST OF SALES	-3	-3	-7	0
Gross margin	3	3	7	0
OPERATING EXPENSES
Marketing and administrative expenses	25	24	89	86
Science and technology expenses	0	0	0	0
Charges related to cost reduction actions	0	0	0	0
Other Expenses, net	-10	-6	-17	-25
Total operating expenses	15	18	72	61
Earnings Before Interest And Taxes	-12	-15	-65	-61
Interest expense, net	27	27	81	76
EARNINGS BEFORE TAXES	-39	-42	-146	-137
Income Tax Expense (Benefit)	16	16	57	52
Equity in net earnings of subsidiaries	74	70	211	122
Equity in net earnings of affiliates	0	0	0	0
NET EARNINGS	51	44	122	37
Less: Net earnings attributable to noncontrolling interests	0	0	0	0
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	51	44	122	37
Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
NET SALES	921	895	2,872	2,846
COST OF SALES	739	741	2,340	2,353
Gross margin	182	154	532	493
OPERATING EXPENSES
Marketing and administrative expenses	68	58	202	190
Science and technology expenses	13	15	43	47
Charges related to cost reduction actions	0	0	0	0
Other Expenses, net	4	24	0	34
Total operating expenses	85	97	245	271
Earnings Before Interest And Taxes	97	57	287	222
Interest expense, net	0	0	1	2
EARNINGS BEFORE TAXES	97	57	286	220
Income Tax Expense (Benefit)	-32	-11	-91	-56
Equity in net earnings of subsidiaries	9	25	16	-41
Equity in net earnings of affiliates	0	-1	0	-1
NET EARNINGS	74	70	211	122
Less: Net earnings attributable to noncontrolling interests	0	0	0	0
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	74	70	211	122
Non Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
NET SALES	497	485	1,451	1,461
COST OF SALES	429	440	1,257	1,327
Gross margin	68	45	194	134
OPERATING EXPENSES
Marketing and administrative expenses	35	33	104	104
Science and technology expenses	6	5	14	13
Charges related to cost reduction actions	6	0	8	36
Other Expenses, net	0	-10	9	10
Total operating expenses	47	28	135	163
Earnings Before Interest And Taxes	21	17	59	-29
Interest expense, net	2	2	5	7
EARNINGS BEFORE TAXES	19	15	54	-36
Income Tax Expense (Benefit)	-10	9	-37	-4
Equity in net earnings of subsidiaries	0	0	0	0
Equity in net earnings of affiliates	0	1	0	1
NET EARNINGS	9	25	17	-39
Less: Net earnings attributable to noncontrolling interests	0	0	1	2
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	9	25	16	-41
Consolidation Eliminations Member
Condensed Financial Statements Captions [Line Items]
NET SALES	-98	-104	-306	-294
COST OF SALES	-98	-104	-306	-294
Gross margin	0	0	0	0
OPERATING EXPENSES
Marketing and administrative expenses	0	0	0	0
Science and technology expenses	0	0	0	0
Charges related to cost reduction actions	0	0	0	0
Other Expenses, net	0	0	0	0
Total operating expenses	0	0	0	0
Earnings Before Interest And Taxes	0	0	0	0
Interest expense, net	0	0	0	0
EARNINGS BEFORE TAXES	0	0	0	0
Income Tax Expense (Benefit)	0	0	0	0
Equity in net earnings of subsidiaries	-83	-95	-227	-81
Equity in net earnings of affiliates	0	0	0	0
NET EARNINGS	-83	-95	-227	-81
Less: Net earnings attributable to noncontrolling interests	0	0	0	0
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	($83)	($95)	($227)	($81)

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE EARNINGS (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements Captions [Line Items]
NET EARNINGS	$51	$44	$123	$39
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	15	28	-30	9
Pension and other postretirement adjustment (net of tax)	2	-1	11	-2
Deferred loss on hedging transactions (net of tax)	0	2	0	3
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest	68	73	104	49
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest	0	0	1	2
Comprehensive Income Net Of Tax	68	73	103	47
Parent Company Member
Condensed Financial Statements Captions [Line Items]
NET EARNINGS	51	44	122	37
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	15	28	-30	9
Pension and other postretirement adjustment (net of tax)	2	-1	11	-2
Deferred loss on hedging transactions (net of tax)	0	2	0	3
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest	68	73	103	47
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest	0	0	0	0
Comprehensive Income Net Of Tax	68	73	103	47
Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
NET EARNINGS	74	70	211	122
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
Pension and other postretirement adjustment (net of tax)	0	0	0	0
Deferred loss on hedging transactions (net of tax)	0	0	0	0
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest	74	70	211	122
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest	0	0	0	0
Comprehensive Income Net Of Tax	74	70	211	122
Non Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
NET EARNINGS	9	25	17	-39
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
Pension and other postretirement adjustment (net of tax)	0	0	0	0
Deferred loss on hedging transactions (net of tax)	0	0	0	0
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest	9	25	17	-39
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest	0	0	1	2
Comprehensive Income Net Of Tax	9	25	16	-41
Consolidation Eliminations Member
Condensed Financial Statements Captions [Line Items]
NET EARNINGS	-83	-95	-227	-81
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
Pension and other postretirement adjustment (net of tax)	0	0	0	0
Deferred loss on hedging transactions (net of tax)	0	0	0	0
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest	-83	-95	-227	-81
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest	0	0	0	0
Comprehensive Income Net Of Tax	($83)	($95)	($227)	($81)

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEET (DETAIL) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$51		$55		$51	$52
Receivables, less allowances	758		600
Inventories	834		786
Other current assets	270		176
Total current assets	1,913		1,617
Property, plant and equipment, net	2,905		2,903
Goodwill	1,166		1,143
Intangible assets	1,046		1,045
Deferred income taxes	482		604
Other non-current assets	215		256
TOTAL ASSETS	7,727		7,568
CURRENT LIABILITIES
Accounts Payable and Accrued Liabilities, Current	938		907
Short-term debt	8		5
Long-term debt - current portion	3		4
Total current liabilities	949		916
Long-term debt, net of current portion	2,175		2,076
Pension plan liability	452		480
Other employee benefits liability	265		274
Deferred income tax liability	35		38
Other liabilities	200		209
Commitments and Contingencies
OWENS CORNING STOCKHOLDERS' EQUITY
Preferred stock	0	[1]	0	[1]
Additional paid in capital	3,961		3,925
Accumulated earnings (deficit)	573		451
Accumulated other comprehensive deficit	-382		-364
Cost of common stock in treasury	-538	[2]	-475	[2]
Total Owens Corning stockholders' equity	3,615		3,538
Noncontrolling interest	36		37
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,651		3,575
TOTAL LIABILITIES AND EQUITY	7,727		7,568
Parent Company Member
CURRENT ASSETS
Cash and cash equivalents	1		0		0	0
Receivables, less allowances	0		0
Due From Affiliate Current	0		0
Inventories	0		0
Assets held for sale - current	0		0
Other current assets	43		5
Total current assets	44		5
Equity Method Investments	7,105		6,877
Due From Affiliate Noncurrent	0		0
Property, plant and equipment, net	359		374
Goodwill	0		0
Intangible assets	0		0
Deferred income taxes	60		54
Assets Held for Sale - Non-Current	0		0
Other non-current assets	20		62
TOTAL ASSETS	7,588		7,372
CURRENT LIABILITIES
Accounts Payable and Accrued Liabilities, Current	31		8
Due To Affiliate Current	1,550		1,419
Short-term debt	0		0
Long-term debt - current portion	0		0
Liabilities held for sale - current			0
Total current liabilities	1,581		1,427
Long-term debt, net of current portion	1,914		1,884
Due To Affiliate Noncurrent	0		0
Pension plan liability	313		331
Other employee benefits liability	0		0
Deferred income tax liability	0		0
Liabilities held for sale - non-current	0
Other liabilities	165		192
OWENS CORNING STOCKHOLDERS' EQUITY
Additional paid in capital	3,961		3,925
Accumulated earnings (deficit)	573		451
Accumulated other comprehensive deficit	-382		-364
Cost of common stock in treasury	-538		-475
Total Owens Corning stockholders' equity	3,615		3,538
Noncontrolling interest	0		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,615		3,538
TOTAL LIABILITIES AND EQUITY	7,588		7,372
Guarantor Subsidiaries Member
CURRENT ASSETS
Cash and cash equivalents	4		3		0	0
Receivables, less allowances	0		0
Due From Affiliate Current	2,726		2,528
Inventories	510		473
Assets held for sale - current	0		0
Other current assets	132		75
Total current assets	3,372		3,079
Equity Method Investments	2,405		2,489
Due From Affiliate Noncurrent	66		65
Property, plant and equipment, net	1,293		1,294
Goodwill	1,127		1,068
Intangible assets	1,017		939
Deferred income taxes	405		525
Assets Held for Sale - Non-Current	0		0
Other non-current assets	68		74
TOTAL ASSETS	9,753		9,533
CURRENT LIABILITIES
Accounts Payable and Accrued Liabilities, Current	599		620
Due To Affiliate Current	0		0
Short-term debt	0		0
Long-term debt - current portion	2		2
Liabilities held for sale - current			0
Total current liabilities	601		622
Long-term debt, net of current portion	27		28
Due To Affiliate Noncurrent	966		1,022
Pension plan liability	0		0
Other employee benefits liability	247		254
Deferred income tax liability	0		0
Liabilities held for sale - non-current	0
Other liabilities	249		172
OWENS CORNING STOCKHOLDERS' EQUITY
Additional paid in capital	6,558		894
Accumulated earnings (deficit)	1,105
Accumulated other comprehensive deficit	0		0
Cost of common stock in treasury	0		0
Total Owens Corning stockholders' equity	7,663		7,435
Noncontrolling interest	0		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,663		7,435
TOTAL LIABILITIES AND EQUITY	9,753		9,533
Non Guarantor Subsidiaries Member
CURRENT ASSETS
Cash and cash equivalents	46		52		51	52
Receivables, less allowances	758		600
Due From Affiliate Current	0		0
Inventories	324		313
Assets held for sale - current	0		0
Other current assets	95		96
Total current assets	1,223		1,061
Equity Method Investments	558		558
Due From Affiliate Noncurrent	966		1,022
Property, plant and equipment, net	1,253		1,235
Goodwill	39		75
Intangible assets	283		302
Deferred income taxes	17		25
Assets Held for Sale - Non-Current	0		0
Other non-current assets	127		120
TOTAL ASSETS	4,466		4,398
CURRENT LIABILITIES
Accounts Payable and Accrued Liabilities, Current	308		279
Due To Affiliate Current	1,176		1,109
Short-term debt	8		5
Long-term debt - current portion	1		2
Liabilities held for sale - current			0
Total current liabilities	1,493		1,395
Long-term debt, net of current portion	234		164
Due To Affiliate Noncurrent	66		65
Pension plan liability	139		149
Other employee benefits liability	18		20
Deferred income tax liability	35		38
Liabilities held for sale - non-current	0
Other liabilities	40		41
OWENS CORNING STOCKHOLDERS' EQUITY
Additional paid in capital	1,962		2,062
Accumulated earnings (deficit)	443		427
Accumulated other comprehensive deficit	0		0
Cost of common stock in treasury	0		0
Total Owens Corning stockholders' equity	2,405		2,489
Noncontrolling interest	36		37
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,441		2,526
TOTAL LIABILITIES AND EQUITY	4,466		4,398
Consolidation Eliminations Member
CURRENT ASSETS
Cash and cash equivalents	0		0		0	0
Receivables, less allowances	0		0
Due From Affiliate Current	-2,726		-2,528
Inventories	0		0
Assets held for sale - current	0		0
Other current assets	0		0
Total current assets	-2,726		-2,528
Equity Method Investments	-10,068		-9,924
Due From Affiliate Noncurrent	-1,032		-1,087
Property, plant and equipment, net	0		0
Goodwill	0		0
Intangible assets	-254		-196
Deferred income taxes	0		0
Assets Held for Sale - Non-Current	0		0
Other non-current assets	0		0
TOTAL ASSETS	-14,080		-13,735
CURRENT LIABILITIES
Accounts Payable and Accrued Liabilities, Current	0		0
Due To Affiliate Current	-2,726		-2,528
Short-term debt	0		0
Long-term debt - current portion	0		0
Liabilities held for sale - current			0
Total current liabilities	-2,726		-2,528
Long-term debt, net of current portion	0		0
Due To Affiliate Noncurrent	-1,032		-1,087
Pension plan liability	0		0
Other employee benefits liability	0		0
Deferred income tax liability	0		0
Liabilities held for sale - non-current	0
Other liabilities	-254		-196
OWENS CORNING STOCKHOLDERS' EQUITY
Additional paid in capital	-8,520		-8,603
Accumulated earnings (deficit)	-1,548		-1,321
Accumulated other comprehensive deficit	0		0
Cost of common stock in treasury	0		0
Total Owens Corning stockholders' equity	-10,068		-9,924
Noncontrolling interest	0		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	-10,068		-9,924
TOTAL LIABILITIES AND EQUITY	($14,080)		($13,735)
[1]	10 shares authorized; none issued or outstanding at Sep. 30, 2013, and Dec. 31, 2012
[2]	17.8 shares at Sep. 30, 2013, and 17.3 shares at Dec. 31, 2012

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (DETAIL) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
NET CASH FLOW PROVIDED BY (USED FOR) OPERATING ACTIVITIES ABSTRACT
NET EARNINGS	$123	$39
Adjustments to reconcile net earnings to cash provided by (used for) operating activities:
Depreciation and amortization	235	269
Gain on sale of business and fixed assets	-6	-3
Impairment of long-lived assets	0	0
Change in deferred income taxes	57	-25
Provision for pension and other employee benefits liabilities	27	33
Share Based Compensation	21	18
Other non-cash	-13	-9
Restricted cash	0	0
Change in working capital	-214	-171
Pension fund contribution	-30	-42
Payments for other employee benefits liabilities	-16	-17
Other	-21	1
Net cash flow provided by (used for) operating activities	163	93
NET CASH FLOW USED FOR INVESTING ACTIVITIES ABSTRACT
Additions to plant and equipment	-199	-235
Payments to Acquire Businesses, Net of Cash Acquired	-62	0
Proceeds from Sale of Assets or Affiliates	16	0
Net cash flow used for investing activities	-217	-223
NET CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES ABSTRACT
Proceeds from senior revolving credit and receivables securitization facilities	1,063	1,205
Payments on senior revolving credit and receivables securitization facilities	-957	-929
Proceeds from long-term debt	0	0
Payments on long-term debt	-1	-13
Net decrease in short-term debt	3	-9
Purchase of treasury stock	-63	-113
Other Financing	7	9
Net cash flow provided by (used for) financing activities	52	128
Effect of exchange rate changes on cash	-2	1
Net decrease in cash and cash equivalents	-4	-1
Cash and cash equivalents at beginning of period	55	52
Cash and cash equivalents at end of period	51	51
Parent Company Member
NET CASH FLOW PROVIDED BY (USED FOR) OPERATING ACTIVITIES ABSTRACT
NET EARNINGS	122	37
Adjustments to reconcile net earnings to cash provided by (used for) operating activities:
Net cash flow provided by (used for) operating activities	-63	-64
NET CASH FLOW USED FOR INVESTING ACTIVITIES ABSTRACT
Additions to plant and equipment	-5	-22
Proceeds from Sale of Assets or Affiliates	16	0
Net cash flow used for investing activities	11	-22
NET CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES ABSTRACT
Proceeds from senior revolving credit and receivables securitization facilities	940	1,089
Payments on senior revolving credit and receivables securitization facilities	-906	-835
Proceeds from long-term debt	0	0
Payments on long-term debt	0	-4
Net decrease in short-term debt	0	-8
Purchase of treasury stock	-63	-113
Intercompany Loans	75	-52
Other Financing	7	9
Net cash flow provided by (used for) financing activities	53	86
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	1	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	1	0
Guarantor Subsidiaries Member
NET CASH FLOW PROVIDED BY (USED FOR) OPERATING ACTIVITIES ABSTRACT
NET EARNINGS	211	122
Adjustments to reconcile net earnings to cash provided by (used for) operating activities:
Net cash flow provided by (used for) operating activities	105	37
NET CASH FLOW USED FOR INVESTING ACTIVITIES ABSTRACT
Additions to plant and equipment	-70	-123
Proceeds from Sale of Assets or Affiliates	0	5
Net cash flow used for investing activities	-95	-118
NET CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES ABSTRACT
Proceeds from senior revolving credit and receivables securitization facilities	0	0
Payments on senior revolving credit and receivables securitization facilities	0	0
Proceeds from long-term debt	0	0
Payments on long-term debt	0	0
Net decrease in short-term debt	0	0
Purchase of treasury stock	0	0
Intercompany Loans	-9	103
Other Financing	0	0
Net cash flow provided by (used for) financing activities	-9	81
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	1	0
Cash and cash equivalents at beginning of period	3	0
Cash and cash equivalents at end of period	4	0
Non Guarantor Subsidiaries Member
NET CASH FLOW PROVIDED BY (USED FOR) OPERATING ACTIVITIES ABSTRACT
NET EARNINGS	17	-39
Adjustments to reconcile net earnings to cash provided by (used for) operating activities:
Net cash flow provided by (used for) operating activities	121	120
NET CASH FLOW USED FOR INVESTING ACTIVITIES ABSTRACT
Additions to plant and equipment	-124	-90
Proceeds from Sale of Assets or Affiliates	0	7
Net cash flow used for investing activities	-133	-83
NET CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES ABSTRACT
Proceeds from senior revolving credit and receivables securitization facilities	123	116
Payments on senior revolving credit and receivables securitization facilities	-51	-94
Proceeds from long-term debt	0	0
Payments on long-term debt	-1	-9
Net decrease in short-term debt	3	-1
Purchase of treasury stock	0	0
Intercompany Loans	-66	-51
Other Financing	0	0
Net cash flow provided by (used for) financing activities	8	-39
Effect of exchange rate changes on cash	-2	1
Net decrease in cash and cash equivalents	-6	-1
Cash and cash equivalents at beginning of period	52	52
Cash and cash equivalents at end of period	46	51
Consolidation Eliminations Member
NET CASH FLOW PROVIDED BY (USED FOR) OPERATING ACTIVITIES ABSTRACT
NET EARNINGS	-227	-81
NET CASH FLOW USED FOR INVESTING ACTIVITIES ABSTRACT
Additions to plant and equipment	0	0
Proceeds from Sale of Assets or Affiliates	0	0
Net cash flow used for investing activities	0	0
NET CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES ABSTRACT
Proceeds from senior revolving credit and receivables securitization facilities	0	0
Payments on senior revolving credit and receivables securitization facilities	0	0
Proceeds from long-term debt	0	0
Payments on long-term debt	0	0
Net decrease in short-term debt	0	0
Purchase of treasury stock	0	0
Intercompany Loans	0	0
Other Financing	0	0
Net cash flow provided by (used for) financing activities	0	0
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$0	$0

SEGMENT_INFORMATION_DETAIL

SEGMENT INFORMATION (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Significant Reconciling Item [Line Items]
Income (Loss) from Operations before Interest and Taxes Attributable to Segments	$135	$97	$394	$310
Restructuring Charges and Related Items	-11	-22	-23	-109
General Corporate Expense	-16	-16	-74	-69
Earnings Before Interest And Taxes	106	59	281	132
Gains Losses Related To Hurricane Sandy	-2	0	-16	0
United States [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	909	856	2,797	2,755
Europe [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	135	133	412	431
Asia Pacific [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	156	165	455	477
Other Geographical [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	120	122	353	350
Composites [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	453	459	1,384	1,433
Income (Loss) from Operations before Interest and Taxes Attributable to Segments	21	11	62	68
Building Materials [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	902	855	2,762	2,719
Income (Loss) from Operations before Interest and Taxes Attributable to Segments	114	86	332	242
All Other Segments [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues				4,152
Corporate Eliminations [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	-35	-38	-129	-139
Roofing [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	471	471	1,586	1,664
Insulation [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	431	384	1,176	1,055
Total Segments [Member]
Segment Reporting, Significant Reconciling Item [Line Items]
Revenues	$1,355	$1,314	$4,146

INVENTORIES_DETAIL

INVENTORIES (DETAIL) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]
Inventory Finished Goods	$584	$554
Inventory Raw Materials And Supplies	250	232
Inventory, Net, Total	$834	$786

DERIVATIVE_FINANCIAL_INSTRUMEN2

DERIVATIVE FINANCIAL INSTRUMENTS BALANCE SHEET (DETAIL) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
DerivativeAssetFairValueNet	$1	$1
Interest Rate Swap Member
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	1
Accounts Payable and Accrued Liabilities [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Natural Gas Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	1	1
Accounts Payable and Accrued Liabilities [Member] | Nondesignated [Member] | Foreign Exchange Contract Member
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	1	3
Other Comprehensive Income Member | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Natural Gas Contract [Member]
Derivatives, Fair Value [Line Items]
Loss Recognized in OCI, Effective Portion	$1	$1

DERIVATIVE_FINANCIAL_INSTRUMEN3

DERIVATIVE FINANCIAL INSTRUMENTS INCOME STMT (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cost Of Sales [Member] | Designated as Hedging Instrument [Member] | Natural Gas Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Reclassified From Accumulated OCI Into Income Effective Portion	$1	$1	$0	$6
Other Expense Member | Nondesignated [Member] | Natural Gas Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing	0	0	0	-1
Other Expense Member | Nondesignated [Member] | Foreign Exchange Contract Member
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Recognized In Income Net	$1	$1	$12	$5

GOODWILL_AND_OTHER_INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (DETAIL) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	$1,198	$1,181
Finite Lived Intangible Assets Accumulated Amortization	-152	-136
Intangible assets	1,046	1,045
Goodwill balance	1,166	1,143
Finite Lived Intangible Assets Average Useful Life	20 years 0 months 0 days	20 years 0 months 0 days
Intangible Asset Expense Five Year Average	22
Customer Relationships [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	180	169
Finite Lived Intangible Assets Accumulated Amortization	-65	-58
Finite-Lived Intangible Assets, Net, Total	115	111
Finite Lived Intangible Assets Average Useful Life	18 years 0 months 0 days	19 years 0 months 0 days
Finite Lived Intangible Assets Net	115	111
Technology [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	196	198
Finite Lived Intangible Assets Accumulated Amortization	-71	-64
Finite-Lived Intangible Assets, Net, Total	125	134
Finite Lived Intangible Assets Net	125	134
Franchise and Other Agreements [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	36	37
Finite Lived Intangible Assets Accumulated Amortization	-16	-14
Finite-Lived Intangible Assets, Net, Total	20	23
Finite Lived Intangible Assets Average Useful Life	14 years 0 months 0 days	14 years 0 months 0 days
Finite Lived Intangible Assets Net	20	23
Trademarks [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	786	777
Indefinite Lived Intangible Assets Excluding Goodwill	$786	$777

GOODWILL_ROLLFORWARD_DETAIL

GOODWILL ROLLFORWARD (DETAIL) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$1,143
Goodwill, Acquired During Period	24
Goodwill, Translation Adjustments	1
Goodwill, Ending Balance	1,166
Composites [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	56
Goodwill, Acquired During Period	2
Goodwill, Translation Adjustments	0
Goodwill, Ending Balance	57
Building Materials [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,087
Goodwill, Acquired During Period	22
Goodwill, Ending Balance	$1,109

PROPERTY_PLANT_AND_EQUIPMENT_D

PROPERTY, PLANT AND EQUIPMENT (DETAIL) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Property Plant And Equipment [Line Items]
Property Plant And Equipment Gross	$4,543	$4,381
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment	1,638	1,478
Property, Plant and Equipment, Net, Total	2,905	2,903
Precious Metals Percentage	17.00%	18.00%
Precious Metals Depletion Percentage	3.00%
Land Member
Property Plant And Equipment [Line Items]
Property Plant And Equipment Gross	222	222
Buildings and Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Gross	817	789
Machinery And Equipment Member
Property Plant And Equipment [Line Items]
Property Plant And Equipment Gross	3,302	3,223
Construction In Progress Member
Property Plant And Equipment [Line Items]
Property Plant And Equipment Gross	$202	$147

ACQUISITIONS_DETAIL

ACQUISITIONS (DETAIL) (USD $)	Sep. 30, 2013	Dec. 31, 2011
In Millions, unless otherwise specified
Business Combinations [Abstract]
BusinessAcquisition goodwill	$24
businessacquisitionintangibleasset	19
Business Acquisition Fair Value	15	52
BusinessAcquisition cash paid	10
businessacquisition accounts payable	5
businessacquisition other liabilities	$8

DIVESTITURES_DETAIL

DIVESTITURES (DETAIL) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Business Divestitures [Line Items]
Divestiture, Amount of Consideration Received	$17
Divestiture, Amount of Future Consideration Receivable	35
Divestiture, Amount of Future Consideration Receivable, Present Value	70
Gain loss on disposition of assets (high)	40
GainLossOnDispositionOfAssets (Low)	30
DivestitureAmountOfFutureConsiderationReceivableNextQuarter	$18

WARRANTIES_DETAIL

WARRANTIES (DETAIL) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Movement In Standard And Extended Product Warranty Increase Decrease Roll Forward
Product Warranty Accrual, Beginning Balance	$41
Product Warranty Accrual Warranties Issued	18
Product Warranty Accrual Payments	18
Product Warranty Accrual, Ending Balance	$41

COST_REDUCTION_ACTIONS_DETAIL

COST REDUCTION ACTIONS (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Reserve Roll Forward
Charges related to cost reduction actions	$6	$0	$8	$36
OtherExitCost	3		9
Composites [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	0		2
Accelerated Depreciation	2		6
Other costs related to restructuring	5		15
Restructuring Reserve Roll Forward
Charges related to cost reduction actions	5		17
Cost Reduction Actions 2012 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2
Cost Reduction Actions 2013 [Member]
Restructuring Reserve Roll Forward
Restructuring Reserve, Beginning Balance			0
Restructuring Reserve Settled With Cash			0
Restructuring Reserve, Ending Balance	6		6
Restructuring And Related Cost Cost Incurred To Date			6
Employee Severance Member | Cost Reduction Actions 2012 [Member] | Composites [Member]
Restructuring Reserve Roll Forward
Restructuring Reserve, Beginning Balance			45
Restructuring Reserve Settled With Cash			-15
Restructuring Reserve, Ending Balance	32		32
Restructuring And Related Cost Cost Incurred To Date			$53

DEBT_DETAIL

DEBT (DETAIL) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Long-Term Debt [Line Items]
Long Term Debt	$2,178	$2,080
Fair Value Adjustment to Debt	20	26
Long Term Debt Current	3	4
Long Term Debt Noncurrent	2,175	2,076
Debt Instrument Issuance Date	17-Oct-12
Short-term Debt [Abstract]
Short-term debt	8	5
Short Term Debt Weighted Average Interest Rate	5.50%	4.50%
Senior Notes Due 2016 [Member]
Long-Term Debt [Line Items]
Long Term Debt	400	400
Debt Instrument Issuance Date	31-Oct-06
Senior Notes Due 2036 [Member]
Long-Term Debt [Line Items]
Long Term Debt	540	540
Debt Instrument Face Amount	1,200
Senior Notes Due 2019 [Member]
Long-Term Debt [Line Items]
Long Term Debt	248	247
Debt Instrument Issuance Date	3-Jun-09
Debt Instrument Face Amount	350
Senior Notes Due 2022 [Member]
Long-Term Debt [Line Items]
Long Term Debt	599	599
Debt Instrument Face Amount	600
Interest Rate Swap Agreement, Principal Amount	100
Senior Revolving Credit Facility B [Member]
Long-Term Debt [Line Items]
Long Term Debt	108	73
Line Of Credit Facility Maximum Borrowing Capacity	800
Letter Of Credit Member
Long-Term Debt [Line Items]
Line Of Credit Facility Amount Outstanding	4	4
Capital Lease Obligations Member
Long-Term Debt [Line Items]
Long Term Debt	50	52
Floating Rate Debt [Member]
Long-Term Debt [Line Items]
Long Term Debt	1	2
Letter Of Credit Under Receivables Purchase Agreement [Member]
Long-Term Debt [Line Items]
Long Term Debt	212	141
Long Term Debt Current	250
Line Of Credit Facility Amount Outstanding	$38	$37

PENSION_PLANS_AND_OTHER_POSTRE1

PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	$2	$4	$11	$12
Defined Benefit Plan, Interest Cost	16	17	49	54
Defined Benefit Plan, Expected Return on Plan Assets	21	22	63	65
Defined Benefit Plan, Amortization of Gains (Losses)	-5	-8	-15	-22
Defined Benefit Plan, Net Periodic Benefit Cost	2	7	12	23
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer			30
United States Pension Plans Of US Entity Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	2	3	7	7
Defined Benefit Plan, Interest Cost	11	12	33	37
Defined Benefit Plan, Expected Return on Plan Assets	14	15	44	45
Defined Benefit Plan, Amortization of Gains (Losses)	-4	-6	-11	-18
Defined Benefit Plan, Net Periodic Benefit Cost	3	6	7	17
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	20		20
Foreign Pension Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	0	1	4	5
Defined Benefit Plan, Interest Cost	5	5	16	17
Defined Benefit Plan, Expected Return on Plan Assets	7	7	19	20
Defined Benefit Plan, Amortization of Gains (Losses)	-1	-2	-4	-4
Defined Benefit Plan, Net Periodic Benefit Cost	-1	1	5	6
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	18		18
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	1	1	2	2
Defined Benefit Plan, Interest Cost	2	2	7	8
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1	1	3	3
Defined Benefit Plan, Amortization of Gains (Losses)	1	1	1	2
Defined Benefit Plan, Net Periodic Benefit Cost	$1	$1	$5	$5

CONTINGENT_LIABILITIES_AND_OTH1

CONTINGENT LIABILITIES AND OTHER MATTERS (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
	Number		Number
Unusual or Infrequent Item [Line Items]
Environmental Liability Sites	20		20
Loss Contingency Estimate Of Possible Loss	$6		$6
COST OF SALES	1,067	1,074	3,284	3,386
Loss from Catastrophes Reported in Cost of Sales	4		26
Loss from Catastrophes Reported in Other (income) expenses	9		16
insurance proceeds	$11		$26

STOCK_COMPENSATION_DETAIL

STOCK COMPENSATION (DETAIL) (USD $)	9 Months Ended			9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Jan. 31, 2011	Sep. 30, 2013	Sep. 30, 2013
		Maximum [Member]	Minimum [Member]	Exercise Price Range One [Member]	Stock Options Member	Stock Options Member	Stock Options Member	Stock Options Member	Restricted Stock Member	Restricted Stock Member	Restricted Stock Member	Restricted Stock Member	Performance Stock Units (PSUs) [Member]	Performance Stock Units (PSUs) [Member]	Performance Stock Units (PSUs) [Member]	Performance Stock Units (PSUs) [Member]	Stock Plan Member, 2013 [Member]	Stock Plan Member, 2013 [Member]	EmployeeStock	EmployeeStock
					Years		Years
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Terms of Award, Maximum (in years)					10		10
Allocated Share Based Compensation Expense					$1	$1	$4	$3	$4	$3	$12	$11	($1)	$5	$5	$11
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition							2 years 8 months 4 days				2 years 9 months 0 days				1 year 10 months 9 days
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Disclosures Abstract
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance											1,875,065				412,910
Nonoptions, Number, Grants In Period	207,050										497,694
Nonoptions, Number, Vested In Period	0										-602,501
Nonoptions, Number, Forfeited In Period	-40,550										-75,869
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance									1,694,389		1,694,389		579,410		579,410
Nonoptions, Weighted Average Fair Value, Beginning Balance											$27.14				$49.14
Nonoptions, Weighted Average Fair Value, Grants in Period	$56.71										$41.13
Nonoptions, Weighted Average Fair Value, Vested	$0										$25.92
Nonoptions, Weighted Average Fair Value, Forfeited											$34.54				$50.36
Nonoptions, Weighted Average Fair Value, Ending Balance									$31.35		$31.35		$51.76		$51.76
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant	3,400,000																3,400,000	1,500,000	2,000,000	2,000,000
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value							$18.94
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate							45.30%
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate							0.00%
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term							6 years 3 months 0 days
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate							1.20%
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized					9		9		28		28		12		12				1	1
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value					25	19	25	19
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value											16	11
Employee emergence equity program expense																			$0.40	$0.60
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward
Options, Outstanding, Number, Beginning Balance	3,025,220
Options, Outstanding, Number, Grants In Period	329,800
Options, Outstanding, Number, Options Exercised	-540,725
Options, Outstanding, Number, Forfeitures In Period	-56,500
Options, Outstanding, Number, Ending Balance	2,757,795
Options, Outstanding, Weighted Average Exercise Price, Beginning of Period	$27.78
Options, Outstanding, Grants In Period Weighted Average Exercise Price	$42.16
Options, Outstanding, Exercises In Period Weighted Average Exercise Price	$26.96
Options, Outstanding, Forfeitures In Period Weighted Average Exercise Price	$34.58
Options, Outstanding, Weighted Average Exercise Price, End of Period	$29.52
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options				2,757,795
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term				5 years 10 months 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance				$29.52
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options				1,948,220
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term				4 years 8 months 15 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price		$42.16	$13.89	$26.73

EARNINGS_PER_SHARE_DETAIL

EARNINGS PER SHARE (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share Abstract
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	$51	$44	$122	$37
Weighted Average Common Shares, Basic	118	117.9	118.4	119.8
Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends	0.4	0.6	0.4	0.5
Incremental Common Shares Attributable To Call Options And Warrants	0.4	0.3	0.5	0.3
Weighted Average Number Diluted Shares Outstanding Adjustment	118.8	118.8	119.3	120.6
Earnings Per Share Basic	$0.43	$0.37	$1.03	$0.31
Earnings Per Share Diluted	$0.43	$0.37	$1.02	$0.31
Equity Class Of Treasury Stock [Line Items]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	8.6		8.6
Stock Repurchase Program, Number of Shares Acquired During Period			1.4
Purchase of treasury stock	$54		$63	$113
Repurchase Program 2012 [Member]
Equity Class Of Treasury Stock [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	10		10
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		0.7	0.3
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			17.5	17.5
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			7.8	7.8
Restricted Stock Member
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	0.2		0.2

FAIR_VALUE_MEASUREMENT_DETAIL

FAIR VALUE MEASUREMENT (DETAIL) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Assets
Cash And Cash Equivalents Fair Value Disclosure	$18	$1
Term Deposits, Fair Value Disclosure	2	1
Derivative Assets	1	1
Total Assets	21	3
Notes Receivable Fair Value Disclosure	10	53
Liabilities
Derivative Liabilities	3	4
Liabilities	3	4
Long-term Debt, Fair Value	370	268
Senior Notes Due 2016 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Notes Payable, Fair Value Disclosure, Par Value	113.00%	112.00%
Senior Notes Due 2036 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Notes Payable, Fair Value Disclosure, Par Value	109.00%	109.00%
Senior Notes Due 2019 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Notes Payable, Fair Value Disclosure, Par Value	122.00%	127.00%
Senior Notes Due 2022 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Notes Payable, Fair Value Disclosure, Par Value	97.00%	102.00%
Fair Value Inputs Level 1 Member
Assets
Cash And Cash Equivalents Fair Value Disclosure	18	1
Term Deposits, Fair Value Disclosure	0	0
Derivative Assets	0	0
Total Assets	18	1
Liabilities
Derivative Liabilities	0	0
Liabilities	0	0
Fair Value Inputs Level 2 Member
Assets
Cash And Cash Equivalents Fair Value Disclosure	0	0
Term Deposits, Fair Value Disclosure	2	1
Derivative Assets	1	1
Total Assets	3	2
Liabilities
Derivative Liabilities	3	4
Liabilities	3	4
Fair Value Inputs Level 3 Member
Assets
Cash And Cash Equivalents Fair Value Disclosure	0	0
Term Deposits, Fair Value Disclosure	0	0
Derivative Assets	0	0
Total Assets	0	0
Liabilities
Derivative Liabilities	0	0
Liabilities	$0	$0

INCOME_TAXES_DETAIL

INCOME TAXES (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
EARNINGS BEFORE TAXES	$77	$30	$194	$47
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Income Tax Expense (Benefit)	$26	($14)	$71	$8
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate Continuing Operations	34.00%	-47.00%	37.00%	17.00%

CHANGES_IN_ACCUMULATED_OTHER_C2

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (DETAIL) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax Abstract
Accumulated other comprehensive deficit	($382)		($382)			($364)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	-1		-1		-1	-1
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	1		2
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-1		-2
Deferred loss on hedging transactions (net of tax)	0	2	0	3
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent [Abstract]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	0		0		-15	30
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	15		-30
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0		0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	15	28	-30	9
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent [Abstract]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	-268		-268		-270	-279
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	2		9
Other Comprehensive Income Translation Impact On Non US Plans Net Of Tax	0		2
Pension and other postretirement adjustment (net of tax)	2	-1	11	-2
Other Comprehensive Income AOCI Valuation
Accumulated Other Comprehensive Income Loss AOCI Valuation	-113		-113		-113	-114
Other comprehensive income translation impact	0		1
Other Comprehensive Income Loss Reclassification AOCI Valuation	0		0
Other comprehensive income loss AOCI Valuation net of tax	$0		$1