Owens Corning (OC) 10-Q6 Nov 242024 Q3 Quarterly reportFinancial data

Company Profile

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
DOCUMENT AND ENTITY INFORMATION - shares	Sep. 30, 2024	Nov. 01, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	1-33100
Entity Registrant Name	Owens Corning
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	43-2109021
Entity Address, Address Line One	One Owens Corning Parkway
Entity Address, City or Town	Toledo
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43659
City Area Code	419
Local Phone Number	248-8000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	OC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding		85,784,321
Entity Central Index Key	0001370946
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONSOLIDATED STATEMENTS OF EARN

CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
NET SALES	$ 3,046	$ 2,479	$ 8,135	$ 7,373
COST OF SALES	2,138	1,752	5,680	5,305
Gross margin	908	727	2,455	2,068
OPERATING EXPENSES
Marketing and administrative expenses	279	201	740	612
Science and technology expenses	36	29	101	85
Gain on sale of site	0	0	0	(189)
Other expense, net	84	35	245	77
Total operating expenses	399	265	1,086	585
OPERATING INCOME	509	462	1,369	1,483
Non-operating income	0	(1)	(1)	(1)
EARNINGS BEFORE INTEREST AND TAXES	509	463	1,370	1,484
Interest expense, net	70	17	151	62
EARNINGS BEFORE TAXES	439	446	1,219	1,422
Income tax expense	120	110	318	361
Equity in net earnings of affiliates	2	1	4	2
NET EARNINGS	321	337	905	1,063
Net loss attributable to non-redeemable and redeemable noncontrolling interests	0	0	0	(2)
NET EARNINGS ATTRIBUTABLE TO OWENS CORNING	$ 321	$ 337	$ 905	$ 1,065
EARNINGS PER COMMON SHARE ATTRIBUTABLE TO OWENS CORNING COMMON STOCKHOLDERS
Basic (in dollars per share)	$ 3.69	$ 3.74	$ 10.38	$ 11.75
Diluted (in dollars per share)	$ 3.65	$ 3.71	$ 10.28	$ 11.64
WEIGHTED AVERAGE COMMON SHARES
Basic (in shares)	87	90	87.2	90.6
Diluted (in shares)	87.9	90.9	88	91.5

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
NET EARNINGS	$ 321	$ 337	$ 905	$ 1,063
Other comprehensive income (loss), net of tax:
Currency translation adjustment (net of tax of $0 and $(2) for the three months ended September 30, 2024 and 2023, respectively, and $0 and $(2) for the nine months ended September 30, 2024 and 2023, respectively)	68	(73)	(37)	(33)
Pension and other postretirement adjustment (net of tax of $0 and $0 for the three months ended September 30, 2024 and 2023, respectively, and $0 and $0 for the nine months ended September 30, 2024 and 2023, respectively)	(4)	2	(5)	(1)
Hedging adjustment (net of tax of $0 and $(2) for the three months ended September 30, 2024 and 2023, respectively, and $(3) and $(4) for the nine months ended September 30, 2024 and 2023, respectively)	1	5	11	11
Other comprehensive income (loss), net of tax	65	(66)	(31)	(23)
COMPREHENSIVE EARNINGS	386	271	874	1,040
Comprehensive loss attributable to non-redeemable and redeemable noncontrolling interests	(1)	(1)	(3)	(4)
COMPREHENSIVE EARNINGS ATTRIBUTABLE TO OWENS CORNING	$ 387	$ 272	$ 877	$ 1,044

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Currency translation tax	$ 0	$ (2)	$ 0	$ (2)
Pension and other postretirement adjustment	0	0	0	0
Hedging tax	$ 0	$ (2)	$ (3)	$ (4)

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
CURRENT ASSETS
Cash and cash equivalents		$ 499	$ 1,615
Receivables, less allowance of $4 at September 30, 2024 and $11 at December 31, 2023		1,577	987
Inventories		1,596	1,198
Other current assets		191	117
Total current assets		3,863	3,917
Property, plant and equipment, net		4,593	3,841
Operating lease right-of-use assets		473	222
Goodwill		2,867	1,392
Intangible assets, net		2,771	1,528
Deferred income taxes		32	24
Other non-current assets		455	313
TOTAL ASSETS		15,054	11,237
CURRENT LIABILITIES
Accounts payable		1,401	1,216
Current operating lease liabilities		88	62
Short-term debt		1	1
Long-term debt - current portion		437	431
Other current liabilities		756	615
Total current liabilities		2,682	2,324
Long-term debt, net of current portion		5,028	2,615
Pension plan liability		69	69
Other employee benefits liability		109	112
Non-current operating lease liabilities		404	165
Deferred income taxes		733	427
Other liabilities		356	315
Total liabilities		9,381	6,027
Redeemable noncontrolling interest		0	25
OWENS CORNING STOCKHOLDERS’ EQUITY
Preferred stock, par value $0.01 per share	[1]	0	0
Common stock, par value $0.01 per share	[2]	1	1
Additional paid in capital		4,204	4,166
Accumulated earnings		5,541	4,794
Accumulated other comprehensive deficit		(531)	(503)
Cost of common stock in treasury	[3]	(3,592)	(3,292)
Total Owens Corning stockholders’ equity		5,623	5,166
Noncontrolling interests		50	19
Total equity		5,673	5,185
TOTAL LIABILITIES AND EQUITY		$ 15,054	$ 11,237

[1]10 shares authorized; none issued or outstanding at September 30, 2024 and December 31, 2023[2] 400 shares authorized; 135.5 issued and 85.8 outstanding at September 30, 2024; 135.5 issued and 87.2 outstanding at December 31, 2023

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4	$ 11
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, outstanding (in shares)	0	0
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	400,000,000	400,000,000
Common stock, issued (in shares)	135,500,000	135,500,000
Common stock, outstanding (in shares)	85,800,000	87,200,000
Treasury stock (in shares)	49,700,000	48,300,000

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions		Total	Common Stock Outstanding	Treasury Stock	APIC		Accumulated Earnings	AOCI		NCI
Beginning balance at Dec. 31, 2022		$ 4,596	$ 1	$ (2,678)	$ 4,139	[1]	$ 3,794	$ (681)	[2]	$ 21	[3]
Common stock, beginning balance (in shares) at Dec. 31, 2022			91.9
Treasury stock, beginning balance (in shares) at Dec. 31, 2022				43.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		383					383
Redeemable noncontrolling interest adjustment to redemption value		(1)			(1)	[1]
Currency translation adjustment		31						31	[2]
Pension and other postretirement adjustment (net of tax)		(1)						(1)	[2]
Deferred gain (loss) on hedging transactions (net of tax)		(1)						(1)	[2]
Issuance of common stock under share-based payment plans, shares			0.7	(0.7)
Issuance of common stock under share-based payment plans		1		$ 23	(22)	[1]
Purchases of treasury stock (shares)			(1.8)	1.8
Purchases of treasury stock		(161)		$ (161)
Stock-based compensation expense		13			13	[1]
Dividends declared	[4]	(48)					(48)
Ending balance at Mar. 31, 2023		4,812	$ 1	$ (2,816)	4,129	[1]	4,129	(652)	[2]	21	[3]
Common stock, ending balance (in shares) at Mar. 31, 2023			90.8
Treasury stock, ending balance (in shares) at Mar. 31, 2023				44.7
Beginning balance at Dec. 31, 2022		4,596	$ 1	$ (2,678)	4,139	[1]	3,794	(681)	[2]	21	[3]
Common stock, beginning balance (in shares) at Dec. 31, 2022			91.9
Treasury stock, beginning balance (in shares) at Dec. 31, 2022				43.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		1,065
Net earnings attributable to non-redeemable noncontrolling interests		(2)
Ending balance at Sep. 30, 2023		5,125	$ 1	$ (3,063)	4,152	[1]	4,718	(703)	[2]	20	[3]
Common stock, ending balance (in shares) at Sep. 30, 2023			88.9
Treasury stock, ending balance (in shares) at Sep. 30, 2023				46.6
Beginning balance at Mar. 31, 2023		4,812	$ 1	$ (2,816)	4,129	[1]	4,129	(652)	[2]	21	[3]
Common stock, beginning balance (in shares) at Mar. 31, 2023			90.8
Treasury stock, beginning balance (in shares) at Mar. 31, 2023				44.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		345					345
Currency translation adjustment		9						10	[2]	(1)	[3]
Pension and other postretirement adjustment (net of tax)		(2)						(2)	[2]
Deferred gain (loss) on hedging transactions (net of tax)		7						7	[2]
Issuance of common stock under share-based payment plans, shares			0.1	(0.1)
Issuance of common stock under share-based payment plans		12		$ 12
Purchases of treasury stock (shares)			(1.1)	1.1
Purchases of treasury stock		(116)		$ (116)
Stock-based compensation expense		14			14	[1]
Dividends declared	[4]	(47)					(47)
Ending balance at Jun. 30, 2023		5,034	$ 1	$ (2,920)	4,143	[1]	4,427	(637)	[2]	20	[3]
Common stock, ending balance (in shares) at Jun. 30, 2023			89.8
Treasury stock, ending balance (in shares) at Jun. 30, 2023				45.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		337					337
Net earnings attributable to non-redeemable noncontrolling interests		0
Currency translation adjustment		(73)						(73)	[2]
Pension and other postretirement adjustment (net of tax)		2						2	[2]
Deferred gain (loss) on hedging transactions (net of tax)		5						5	[2]
Issuance of common stock under share-based payment plans, shares			0.1	(0.1)
Issuance of common stock under share-based payment plans				$ 2	(2)	[1]
Purchases of treasury stock (shares)			(1)	1
Purchases of treasury stock		(145)		$ (145)
Stock-based compensation expense		11			11	[1]
Dividends declared	[4]	(46)					(46)
Ending balance at Sep. 30, 2023		5,125	$ 1	$ (3,063)	4,152	[1]	4,718	(703)	[2]	20	[3]
Common stock, ending balance (in shares) at Sep. 30, 2023			88.9
Treasury stock, ending balance (in shares) at Sep. 30, 2023				46.6
Beginning balance at Dec. 31, 2023		$ 5,185	$ 1	$ (3,292)	4,166	[5]	4,794	(503)	[6]	19	[7]
Common stock, beginning balance (in shares) at Dec. 31, 2023		87.2	87.2
Treasury stock, beginning balance (in shares) at Dec. 31, 2023		48.3		48.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		$ 299					299
Redeemable noncontrolling interest adjustment to redemption value		(1)			(1)	[5]
Currency translation adjustment		(42)						(41)	[6]	(1)	[7]
Deferred gain (loss) on hedging transactions (net of tax)		5						5	[6]
Issuance of common stock under share-based payment plans, shares			0.6	(0.6)
Issuance of common stock under share-based payment plans		1		$ 21	(20)	[5]
Purchases of treasury stock (shares)			(1.1)	1.1
Purchases of treasury stock		(162)		$ (162)
Stock-based compensation expense		14			14	[5]
Dividends declared	[8]	(52)					(52)
Ending balance at Mar. 31, 2024		5,247	$ 1	$ (3,433)	4,159	[5]	5,041	(539)	[6]	18	[7]
Common stock, ending balance (in shares) at Mar. 31, 2024			86.7
Treasury stock, ending balance (in shares) at Mar. 31, 2024				48.8
Beginning balance at Dec. 31, 2023		$ 5,185	$ 1	$ (3,292)	4,166	[5]	4,794	(503)	[6]	19	[7]
Common stock, beginning balance (in shares) at Dec. 31, 2023		87.2	87.2
Treasury stock, beginning balance (in shares) at Dec. 31, 2023		48.3		48.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		$ 905
Net earnings attributable to non-redeemable noncontrolling interests		0
Ending balance at Sep. 30, 2024		$ 5,673	$ 1	$ (3,592)	4,204	[5]	5,541	(531)	[6]	50	[7]
Common stock, ending balance (in shares) at Sep. 30, 2024		85.8	85.8
Treasury stock, ending balance (in shares) at Sep. 30, 2024		49.7		49.7
Beginning balance at Mar. 31, 2024		$ 5,247	$ 1	$ (3,433)	4,159	[5]	5,041	(539)	[6]	18	[7]
Common stock, beginning balance (in shares) at Mar. 31, 2024			86.7
Treasury stock, beginning balance (in shares) at Mar. 31, 2024				48.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		285					285
Net earnings attributable to non-redeemable noncontrolling interests		1								1	[7]
Currency translation adjustment		(63)						(62)	[6]	(1)	[7]
Pension and other postretirement adjustment (net of tax)		(1)						(1)	[6]
Deferred gain (loss) on hedging transactions (net of tax)		5						5	[6]
Purchases of noncontrolling interest		35								35	[7]
Issuance of common stock under share-based payment plans, shares			0.3	(0.3)
Issuance of common stock under share-based payment plans		13		$ 60	(47)	[5]
Purchases of treasury stock (shares)			(0.1)	0.1
Purchases of treasury stock		(18)		$ (18)
Stock-based compensation expense		39			39	[5]
Fair value of awards included in transaction consideration		35			35	[5]
Dividends declared	[8]	(53)					(53)
Ending balance at Jun. 30, 2024		5,525	$ 1	$ (3,391)	4,186	[5]	5,273	(597)	[6]	53	[7]
Common stock, ending balance (in shares) at Jun. 30, 2024			86.9
Treasury stock, ending balance (in shares) at Jun. 30, 2024				48.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Owens Corning		321					321
Return of capital to non-redeemable noncontrolling interests		(2)								(2)	[7]
Net earnings attributable to non-redeemable noncontrolling interests		0
Currency translation adjustment		68						69	[6]	(1)	[7]
Pension and other postretirement adjustment (net of tax)		(4)						(4)	[6]
Deferred gain (loss) on hedging transactions (net of tax)		1						1	[6]
Issuance of common stock under share-based payment plans, shares			0.1	(0.1)
Issuance of common stock under share-based payment plans		1		$ 4	(3)	[5]
Purchases of treasury stock (shares)			(1.2)	1.2
Purchases of treasury stock		(205)		$ (205)
Stock-based compensation expense		21			21	[5]
Dividends declared	[8]	(53)					(53)
Ending balance at Sep. 30, 2024		$ 5,673	$ 1	$ (3,592)	$ 4,204	[5]	$ 5,541	$ (531)	[6]	$ 50	[7]
Common stock, ending balance (in shares) at Sep. 30, 2024		85.8	85.8
Treasury stock, ending balance (in shares) at Sep. 30, 2024		49.7		49.7

[1] Additional Paid in Capital (“APIC”) Accumulated Other Comprehensive Earnings (Deficit) (“AOCI”) Noncontrolling Interests (“NCI”) Quarterly dividend declaration of $0.52 per share as of September 30, 2023, June 30, 2023 and March 31, 2023 Additional Paid in Capital (“APIC”) Accumulated Other Comprehensive Earnings (Deficit) (“AOCI”) Noncontrolling Interests (“NCI”) Quarterly dividend declaration of $0.60 per share as of September 30, 2024, June 30, 2024 and March 31, 2024

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividends (dollars per share)	$ 0.60	$ 0.60	$ 0.60	$ 0.52	$ 0.52	$ 0.52

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
NET CASH FLOW PROVIDED BY OPERATING ACTIVITIES
NET EARNINGS	$ 905	$ 1,063
Adjustments to reconcile net earnings to cash from operating activities:
Depreciation and amortization	483	446
Deferred income taxes	(55)	40
Stock-based compensation expense	74	38
Gains on sale of certain precious metals	(19)	(2)
Gain on sale of site	0	(189)
Other adjustments to reconcile net earnings to cash from operating activities	(8)	23
Changes in operating assets and liabilities	(147)	(384)
Pension fund contribution	(4)	(4)
Payments for other employee benefits liabilities	(8)	(8)
Other	(5)	(2)
Net cash flow provided by operating activities	1,216	1,021
NET CASH FLOW USED FOR INVESTING ACTIVITIES
Cash paid for property, plant, and equipment	(450)	(390)
Proceeds from the sale of assets or affiliates	114	189
Investment in subsidiaries and affiliates, net of cash acquired	(2,857)	(6)
Other	0	(12)
Net cash flow used for investing activities	(3,193)	(219)
NET CASH FLOW PROVIDED BY (USED FOR) FINANCING ACTIVITIES
Proceeds from long-term debt	1,968	0
Payments on long-term debt	(473)	0
Proceeds from senior revolving credit and receivables securitization facilities	560	0
Payments on senior revolving credit and receivables securitization facilities	(560)	0
Proceeds from term loan borrowing	2,784	0
Payments on term loan borrowing	(2,800)	0
Dividends paid	(156)	(142)
Purchases of treasury stock	(388)	(419)
Finance lease payments	(29)	(24)
Other	(5)	0
Net cash flow provided by (used for) financing activities	901	(585)
Effect of exchange rate changes on cash	(28)	8
Net (decrease) increase in cash, cash equivalents, and restricted cash	(1,104)	225
Cash, cash equivalents and restricted cash at beginning of period	1,623	1,107
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$ 519	$ 1,332

GENERAL

GENERAL	9 Months Ended
GENERAL	Sep. 30, 2024
Accounting Changes and Error Corrections [Abstract]
GENERAL	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 (“SEC”), and include, in the opinion of the Company, normal recurring 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, 2023 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 Annual Report on Form 10-K for the year ended December 31, 2023 (the “2023 Form 10-K”). Certain reclassifications have been made to the periods presented for 2023 to conform to the classifications used in the periods presented for 2024. Acquisition of Masonite International Corporation On May 15, 2024, the Company acquired all of the outstanding shares of Masonite International Corporation (“Masonite”) at a purchase price of $133.00 per share (the "Arrangement"). Masonite is a leading global designer, manufacturer, marketer and distributor of interior and exterior doors and door systems for residential new construction and residential repair and remodeling. The addition of Masonite's market-leading doors business creates a new growth platform for the Company, strengthening the Company's position in building and construction and expanding its offering of branded residential building products. Masonite's operating results and preliminary purchase price allocation have been included in the Company's newly established Doors reportable segment from May 15, 2024, the effective date of the Arrangement, within the Consolidated Financial Statements. Please refer to Note 7 of the Consolidated Financial Statements for further information. Revenue Recognition As of December 31, 2023, our contract liability balances (for extended warranties, down payments and deposits, collectively) totaled $101 million, of which $19 million was recognized as revenue in the first nine months of 2024. As of September 30, 2024, our contract liability balances totaled $115 million. As of December 31, 2022, our contract liability balances totaled $89 million, of which $17 million was recognized as revenue in the first nine months of 2023. As of September 30, 2023, our contract liability balances totaled $96 million. Cash, Cash Equivalents and Restricted Cash On the Consolidated Statements of Cash Flows, the total of Cash, cash equivalents and restricted cash includes restricted cash of $20 million as of September 30, 2024, $9 million as of September 30, 2023 and $8 million as of December 31, 2023 and December 31, 2022. Restricted cash primarily represents cash we have placed as collateral for standby letters of credit and amounts received from a counterparty related to its performance assurance on an executory contract. The letters of credit guarantee payment to third parties in the event the Company is in breach of contract terms as detailed in each letter of credit. The amounts received from a counterparty are contractually required to be set aside, and the counterparty can exchange the cash for another form of performance assurance at its discretion. These amounts are included in Other current assets on the Consolidated Balance Sheets. Accounts Receivable Our customers consist mainly of distributors, home centers, contractors and retailers. Two of our largest customers accounted for 23% and 15%, respectively, of consolidated accounts receivable as of September 30, 2024 and 11% and 11%, respectively, of consolidated accounts receivable as of December 31, 2023. Related Party Transactions In the first quarter of 2021, a related party relationship was established as a result of a member of the Company’s Board of Directors being named an executive officer of one of the Company’s preexisting suppliers. The related party transactions with this supplier consist of the purchase of raw materials. Purchases from the related party supplier were $20 million and $85 million for the three and nine months ended September 30, 2024, respectively, and $22 million and $72 million for the three and nine months ended September 30, 2023, respectively. As of September 30, 2024 and December 31, 2023, amounts due to the related party supplier were $3 million and $5 million, respectively. Supplier Finance Programs We review supplier terms and conditions on an ongoing basis, and have negotiated payment terms extensions in recent years in connection with our efforts to reduce working capital and improve cash flow. Separate from those terms extension actions, certain of our subsidiaries have entered into paying agency agreements with third-party administrators. These voluntary supply chain finance programs (collectively, the “Programs”) generally give participating suppliers the ability to sell, or otherwise pledge as collateral, their receivables from the Company to the participating financial institutions, at the sole discretion of both the suppliers and financial institutions. The Company is not a party to the arrangements between the suppliers and the financial institutions. The Company’s obligations to its suppliers, including amounts due and scheduled payment dates, are not impacted by the suppliers’ decisions to sell, or otherwise pledge as collateral, amounts under these arrangements. The Company’s payment terms to the financial institutions, including the timing and amount of payments, are based on the original supplier invoices. One of the Programs includes a parent guarantee to the participating financial institution for a certain U.S. subsidiary that, at the time of the respective program’s inception in 2015, was a guarantor subsidiary of the Company’s Credit Agreement. The obligations are presented as Accounts payable within Total current liabilities on the Consolidated Balance Sheets and all activity related to the obligations is presented within operating activities on the Consolidated Statements of Cash Flow. The Company’s confirmed outstanding obligations under the Programs totaled $180 million and $211 million as of September 30, 2024 and December 31, 2023, respectively. The amounts of invoices paid under the Programs totaled $405 million and $454 million for the nine months ended September 30, 2024 and September 30, 2023, respectively. Strategic Actions On February 9, 2024, the Company announced the decision to review strategic alternatives for its global glass reinforcements (“GR”) business, consistent with our strategy to focus on building and construction materials. The GR business, which operates within our Composites segment, supplies a wide variety of glass fiber products for applications in wind energy, infrastructure, industrial, transportation, and consumer markets. The GR business generates annual revenues of approximately $1.3 billion. While a range of options are under consideration, including a potential sale, spin-off or other strategic option, there can be no assurance that the strategic review will result in any transaction or other outcome. During the first nine months of 2024, the Company incurred $33 million of costs related to this review. Accounting Policies There have been no changes in the significant accounting policies from those that were disclosed in the 2023 Form 10-K. Critical Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates. Accounting estimates and assumptions discussed in this section are those considered to be the most critical to an understanding of our financial statements because they involve significant judgments and uncertainties. There have been no material changes to our critical accounting estimates previously disclosed in Item 7 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, except as follows: Fair values of assets acquired and liabilities assumed in acquisitions — Assets acquired and liabilities assumed in a business combination are recorded at their estimated fair values on the date of acquisition. The difference between the purchase price amount and the net fair value of assets acquired and liabilities assumed is recognized as goodwill on the balance sheet if the purchase price exceeds the estimated net fair value or as a bargain purchase gain on the income statement if the purchase price is less than the estimated net fair value. We apply significant judgment in estimating the fair value of assets acquired and liabilities assumed, which involves the use of significant estimates and assumptions. Changes in these judgments or estimates can have a material impact on the valuation of the respective assets and liabilities acquired and our results of operations in periods after acquisition. The allocation of the purchase price is preliminary for up to one year after the acquisition date as more information is obtained about the fair value of assets acquired and liabilities assumed. See Note 7 of the Consolidated Financial Statements for further information on the fair values of assets acquired and liabilities assumed in recent business combinations, as well as the measurement period adjustments to the purchase price allocation. Goodwill Impairment Assessment — When it is determined necessary for the Company to perform the quantitative impairment process for goodwill, we estimate fair value using a discounted cash flow approach from the perspective of a market participant, as well as the market approach. For the market approach, we use market multiples derived from a set of similar companies. Accounting Pronouncements The following table summarizes recent Accounting Standard Updates ("ASU") issued by the Financial Accounting Standards Board ("FASB") that could have an impact on the Company's Consolidated Financial Statements: Standard Description Effective Date for Company Effect on the Recently issued standards: ASU 2024-01 "Compensation - Stock Compensation" (Topic 718): Scope Application of Profits Interest and Similar Awards This amendment adds an illustrative example to demonstrate how an entity should apply the scope guidance in paragraph 718-10-15-3 to determine whether profits interest and similar awards should be accounted for in accordance with Topic 718. Fiscal years beginning after December 15, 2024 We do not believe the adoption of this guidance will have a material effect on our Consolidated Financial Statements. ASU 2024-02 "Codification Improvements - Amendments to Remove References to the Concepts Statements" Amendments in this update remove references to various FASB Concepts Statements. Fiscal years beginning after December 15, 2024 We do not believe the adoption of this guidance will have a material effect on our Consolidated Financial Statements. ASU 2024-03 "Income Statement – Reporting Comprehensive Income- Expense Disaggregation Disclosures (Subtopic 220-40)" The amendments in this update require disclosure, in the notes to financial statements, of specified information about certain costs and expenses. Fiscal years beginning after December 15, 2026 We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statements. We do not believe the adoption of this guidance will have a material effect on our results of operations. ASU 2023-06 “Disclosure Improvements” The amendments in this update modify the disclosure or presentation requirements of a variety of Topics. The effective date for each topic is contingent on future SEC rule setting. We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statement disclosures. We do not believe the adoption of this guidance will have a material effect on our results of operations. ASU 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” The amendments in this update improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. Fiscal years beginning after December 15, 2023 We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statement disclosures. We do not believe the adoption of this guidance will have a material effect on our results of operations. ASU 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” This standard modifies the rate reconciliation and income taxes paid disclosures by requiring consistent categories and greater disaggregation of information in the rate reconciliation, as well as requiring income taxes paid to be disaggregated by jurisdiction. Fiscal years beginning after December 15, 2024 We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statements. We do not believe the adoption of this guidance will have a material effect on our results of operations.

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
SEGMENT INFORMATION	Sep. 30, 2024
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION As a result of our acquisition of Masonite International Corporation, which was completed on May 15, 2024, the Company now has four reportable segments: Roofing, Insulation, Doors, and Composites. Accounting policies for the segments are the same as those for the Company. The Company’s four reportable segments are defined as follows: Roofing – Within our Roofing segment, the Company manufactures and sells residential roofing shingles, oxidized asphalt materials, and roofing components primarily used in residential and commercial construction. Insulation – Within our Insulation segment, the Company manufactures and sells thermal and acoustical batts, loose fill insulation, spray foam insulation, foam sheathing and accessories. It also manufactures and sells glass fiber pipe insulation, energy efficient flexible duct media, bonded and granulated stone wool insulation, cellular glass insulation, and foam insulation used in above- and below-grade construction applications. Doors – Within our new Doors segment, the Company manufactures and sells interior and exterior doors and door systems primarily used in residential construction. Composites – Within our Composites segment, the Company manufactures, fabricates and sells glass reinforcements in the form of fiber. Glass reinforcement materials are also used by the Composites segment to manufacture and sell high value applications in the form of non-wovens, fabrics and composite lumber. NET SALES The following tables show a disaggregation of our Net sales by segment and geographic region (in millions). Corporate eliminations (shown below) largely reflect intercompany sales from Composites to Roofing. External customer sales are attributed to geographic region based upon the location from which the product is sold to the external customer. For the three months ended September 30, 2024 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 1,019 $ 416 $ 445 $ 122 $ (82) $ 1,920 U.S. commercial and industrial 43 195 — 181 (2) 417 Total United States 1,062 611 445 303 (84) 2,337 Europe — 183 57 107 (1) 346 Asia-Pacific — 34 — 94 — 128 Rest of world 16 118 71 30 — 235 NET SALES $ 1,078 $ 946 $ 573 $ 534 $ (85) $ 3,046 For the three months ended September 30, 2023 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 1,009 $ 351 $ — $ 98 $ (82) $ 1,376 U.S. commercial and industrial 49 218 — 201 (2) 466 Total United States 1,058 569 — 299 (84) 1,842 Europe 5 191 — 115 (1) 310 Asia-Pacific — 37 — 111 — 148 Rest of world 21 116 — 42 — 179 NET SALES $ 1,084 $ 913 $ — $ 567 $ (85) $ 2,479 For the nine months ended September 30, 2024 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 2,991 $ 1,177 $ 689 $ 360 $ (249) $ 4,968 U.S. commercial and industrial 100 606 — 536 (7) 1,235 Total United States 3,091 1,783 689 896 (256) 6,203 Europe — 543 87 347 (2) 975 Asia-Pacific — 98 1 265 — 364 Rest of world 49 342 107 95 — 593 NET SALES $ 3,140 $ 2,766 $ 884 $ 1,603 $ (258) $ 8,135 For the nine months ended September 30, 2023 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 2,902 $ 1,045 $ — $ 270 $ (230) $ 3,987 U.S. commercial and industrial 113 647 — 656 (6) 1,410 Total United States 3,015 1,692 — 926 (236) 5,397 Europe 13 586 — 387 (2) 984 Asia-Pacific 1 109 — 334 — 444 Rest of world 73 350 — 125 — 548 NET SALES $ 3,102 $ 2,737 $ — $ 1,772 $ (238) $ 7,373 Sales to major customers - The Company had two customers that exceeded 10% of consolidated net sales for the nine months ended September 30, 2024. The first customer, which is a customer of both the Roofing and Insulation segments, accounted for approximately 12% of the Company's consolidated net sales for the nine months ended September 30, 2024 and September 30, 2023. The second customer, which is a customer of the Roofing, Insulation and Doors segments, accounted for approximately 12% of the Company's consolidated net sales for the nine months ended September 30, 2024. This customer's sales did not exceed 10% during the nine months ended September 30, 2023. 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 within Corporate, Other and Eliminations. The following table summarizes EBIT by segment (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Reportable Segments Roofing $ 359 $ 343 $ 1,018 $ 890 Insulation 183 150 527 469 Doors 36 — 70 — Composites 61 80 168 216 Total reportable segments 639 573 1,783 1,575 Restructuring costs (1) (41) (62) (106) Gain on sale of Santa Clara, California site — — — 189 Gains on sale of certain precious metals 19 — 19 2 Paroc marine recall (1) (14) (8) (14) Strategic review-related charges (16) — (33) — Acquisition-related transaction costs (2) — (49) — Acquisition-related integration costs (53) — (74) — Impairment of venture investment (13) — (13) — Recognition of acquisition inventory fair value step-up (6) — (18) — General corporate expense and other (57) (55) (175) (162) Total corporate, other and eliminations (130) (110) (413) (91) EBIT $ 509 $ 463 $ 1,370 $ 1,484

INVENTORIES

INVENTORIES	9 Months Ended
INVENTORIES	Sep. 30, 2024
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories consist of the following (in millions): September 30, 2024 December 31, 2023 Finished goods $ 842 $ 742 Materials and supplies 754 456 Total inventories $ 1,596 $ 1,198

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	9 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS The Company is exposed to, among other risks, the impact of changes in commodity prices, foreign currency exchange rates, and interest rates in the normal course of business. The Company’s risk management program is designed to manage the exposure and volatility arising from these risks, and utilizes derivative financial instruments to offset a portion of these risks. The Company uses derivative financial instruments only to the extent necessary to hedge identified business risks, and does not enter into such transactions for trading purposes. The Company generally does not require collateral or other security with counterparties to these financial instruments and is therefore subject to credit risk in the event of nonperformance; however, the Company monitors credit risk and currently does not anticipate nonperformance by other parties. Contracts with counterparties generally contain right of offset provisions. These provisions effectively reduce the Company’s exposure to credit risk in situations where the Company has gain and loss positions outstanding with a single counterparty. It is the Company’s policy to offset on the Consolidated Balance Sheets the amounts recognized for derivative instruments with any cash collateral arising from derivative instruments executed with the same counterparty under a master netting agreement. As of September 30, 2024 and December 31, 2023, 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. Derivative Fair Values Our derivatives consist of natural gas forward swaps and foreign exchange forward contracts, all of which are over-the-counter and not traded through an exchange. The Company uses widely accepted valuation tools to determine fair value, such as discounting cash flows to calculate a present value for the derivatives. The models use Level 2 inputs, such as forward curves and other commonly quoted observable transactions and prices. The fair value of our derivatives and hedging instruments are all classified as Level 2 investments within the three-tier hierarchy. The following table presents the fair value of derivatives and hedging instruments and their respective location on the Consolidated Balance Sheets (in millions): Fair Value at Location September 30, 2024 December 31, 2023 Derivative assets designated as hedging instruments: Cash flow hedges: Natural gas forward swaps Other current assets $ 1 $ — Derivative liabilities designated as hedging instruments: Cash flow hedges: Natural gas forward swaps Other current liabilities $ 2 $ 15 Derivative assets not designated as hedging instruments: Foreign exchange forward contracts Other current assets $ 1 $ 1 Derivative liabilities not designated as hedging instruments: Foreign exchange forward contracts Other current liabilities $ 1 $ 1 Consolidated Statements of Earnings Activity 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 Location 2024 2023 2024 2023 Derivative activity designated as hedging instruments: Natural gas cash flow hedges: Amount of loss reclassified from AOCI (as defined below) into earnings (a) Cost of sales $ 2 $ 10 $ 16 $ 42 Treasury interest rate lock: Amount of gain reclassified from AOCI (as defined below) into earnings (a) Interest expense, net $ 1 $ — $ 1 $ — Derivative activity not designated as hedging instruments: Foreign currency: Amount of (gain) loss recognized in earnings (b) Other expense, net $ — $ — $ (4) $ 4 (a) Accumulated Other Comprehensive Earnings (Deficit) (“AOCI”) (b) (Gains)/losses related to foreign currency derivatives were substantially offset by net revaluation impacts on foreign currency denominated balance sheet exposures, which were also recorded in Other expense, net. Please refer to the “Other Derivatives” section below for additional detail. Consolidated Statements of Comprehensive Earnings Activity The following table presents the impact of derivative activities on the Consolidated Statements of Comprehensive Earnings (in millions): Amount of Gain Recognized in Comprehensive Earnings Three Months Ended Nine Months Ended Hedging Type Derivative Financial Instrument 2024 2023 2024 2023 Cash flow hedge Natural gas forward swaps $ 1 $ 6 $ 14 $ 14 Cash Flow Hedges The Company uses a combination of derivative financial instruments, which qualify as cash flow hedges, and physical contracts to manage forecasted exposure to electricity and natural gas prices. As of September 30, 2024, the notional amounts of these natural gas forward swaps were 7 million MMBtu (or MMBtu equivalent) based on U.S. and European indices. The Company has designated these natural gas forward swaps as cash flow hedges, with the last hedge maturing no later than December 2025. A net unrecognized loss of $1 million related to these natural gas forward swaps was included in AOCI as of September 30, 2024, $1 million of which is expected to be reclassified into earnings within the next twelve months. In 2020, the Company entered into a $175 million forward U.S. Treasury rate lock agreement to manage the U.S. Treasury portion of its interest rate risk associated with the anticipated issuance of certain 10-year fixed rate senior notes. The Company designated this forward U.S. Treasury rate lock agreement, which expired on December 15, 2022, as a cash flow hedge. The locked fixed rate of this agreement was 0.994%. In September 2022, a gain of $6 million was recognized as a result of a change in the forecasted issuance of certain senior notes. In December 2022, the Company received cash of $37 million upon the settlement of the rate lock agreement, of which $31 million will be amortized as a component of interest expense upon the future issuance of senior notes. In May 2024, the Company issued new senior notes and began amortizing the $31 million over the life of the Company's 5.700% senior notes due 2034, of which $1 million was recognized during the nine months ended September 30, 2024. The unrecognized gain of $30 million was included in AOCI as of September 30, 2024. 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. As of September 30, 2024, the Company had notional amounts of $131 million for non-designated derivative financial instruments related to foreign currency exposures in United States Dollars primarily related to the Indian Rupee, Brazilian Real, Korean Won, Chinese Yuan, Hong Kong Dollar, and the Japanese Yen. In addition, the Company had notional amounts of $78 million for non-designated derivative financial instruments related to foreign currency exposures in European Euro primarily related to the Polish Złoty, Danish Krone, Norwegian Krone and the Chinese Yuan.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER 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 value. During the third quarter of 2024, the Company performed its quarterly assessment to identify potential indicators of impairment for each of its reporting units. Among qualitative and quantitative factors considered, management reviewed key assumptions and information, including updated macroeconomic indicators that impact the markets we serve, and financial forecast information for each reporting unit. The annual impairment tests performed in the fourth quarter of 2023 indicated that the business enterprise value of the Composites reporting unit exceeded its carrying value by approximately 5%. Given this narrow cushion of Composites reporting unit fair value in excess of carrying value and the ongoing strategic review of the glass reinforcements business, the Company performed an interim goodwill impairment test as of September 30, 2024 for the Composites reporting unit. The interim testing indicated that the business enterprise value of the Composites reporting unit exceeded its carrying value by less than 10%. There is uncertainty as to the outcome of the strategic review of our glass reinforcements business and the macroeconomic factors that impact this reporting unit. The likelihood of a future impairment could be increased by a sustained downturn in these macroeconomic factors, a change in the long-term revenue growth or profitability for this reporting unit, or the outcome of the strategic review. The changes in the net carrying value of goodwill by segment are as follows (in millions): Roofing Insulation Doors Composites Total Gross carrying amount at December 31, 2023 $ 395 $ 1,520 $ — $ 425 $ 2,340 Acquisitions (see Note 7) — — 1,473 — 1,473 Foreign currency translation 1 3 — — 4 Gross carrying amount at September 30, 2024 396 1,523 1,473 425 3,817 Accumulated impairment losses at December 31, 2023 — (948) — — (948) Foreign currency translation — (2) — — (2) Accumulated impairment losses at September 30, 2024 — (950) — — (950) Balance, net of impairment, at September 30, 2024 $ 396 $ 573 $ 1,473 $ 425 $ 2,867 Other Intangible Assets The Company amortizes the cost of other intangible assets over their estimated useful lives which, individually, range up to 25 years. The Company’s future cash flows are not materially impacted by its ability to extend or renew agreements related to its amortizable intangible assets. Other intangible assets consist of the following (in millions): September 30, 2024 December 31, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Accumulated Net Indefinite-lived trademarks and trade names $ 1,232 $ — $ 1,232 $ 992 $ — $ 992 Amortizable intangible assets Customer relationships 1,595 (349) 1,246 614 (283) 331 Technology 432 (233) 199 326 (203) 123 Trademarks and trade names 31 (3) 28 12 (2) 10 Other (a) 67 (1) 66 74 (2) 72 Total other intangible assets $ 3,357 $ (586) $ 2,771 $ 2,018 $ (490) $ 1,528 (a) Other primarily includes emissions rights. There are two indefinite-lived intangible assets that are at an increased risk of impairment, both of which are used by our Insulation segment and were partially impaired in the fourth quarter of 2022. A change in the estimated long-term revenue growth rate or discount rate for the segment could increase the likelihood of a future impairment. Trademarks and trade names September 30, 2024 European building and technical insulation trade name $ 91 Global cellular glass insulation trademark $ 80 Amortization expense for intangible assets for the three and nine months ended September 30, 2024 was $42 million and $97 million, respectively. Amortization expense for intangible assets for the three and nine months ended September 30, 2023 was $28 million and $70 million, respectively. Amortization expense for intangible assets is estimated to be $31 million for the remainder of 2024. The estimated amortization expense for intangible assets for the next five fiscal years ended December 31 is as follows (in millions): Period Amortization 2025 $ 150 2026 $ 136 2027 $ 127 2028 $ 126 2029 $ 112

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	9 Months Ended
PROPERTY, PLANT AND EQUIPMENT	Sep. 30, 2024
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consist of the following (in millions): September 30, December 31, 2023 Land $ 225 $ 168 Buildings and leasehold improvements 1,549 1,263 Machinery and equipment 6,203 5,402 Construction in progress 504 665 Property, plant and equipment, gross 8,481 7,498 Accumulated depreciation (3,888) (3,657) Property, plant and equipment, net $ 4,593 $ 3,841 Machinery and equipment include certain precious metals used in our production tooling, which comprise approximately 7% and 10% of total machinery and equipment as of September 30, 2024 and December 31, 2023, respectively. Precious metals used in our production tooling are depleted as they are consumed during the production process, which typically represents an annual expense of approximately 2% of the outstanding carrying value. Our production tooling needs in our Composites segment are changing due to a strategic shift in the Company's metal ownership portfolio, as well as, in response to changes in economic and technological factors. As a result, the Company sold certain precious metals resulting in gains of $19 million for the three and nine months ended September 30, 2024. These gains are included in Other expense, net on the Consolidated Statements of Earnings and are reflected in the Corporate, Other and Eliminations reporting category. The cash proceeds from the sales are included in Net cash flow used for investing activities in the Consolidated Statements of Cash Flow.

ACQUISITIONS

ACQUISITIONS	9 Months Ended
ACQUISITIONS	Sep. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
ACQUISITIONS	ACQUISITIONS On February 8, 2024, the Company entered into an Arrangement Agreement (the "Arrangement Agreement") with Masonite International Corporation, a British Columbia corporation ("Masonite"), pursuant to which the Company agreed to acquire all of the issued and outstanding common shares of Masonite at a purchase price of $133.00 per share (the "Arrangement"). On May 15, 2024, as determined by the Arrangement Agreement, the Company completed the acquisition of 100% of the issued and outstanding shares of Masonite for $133.00 per share in cash, without interest for a total purchase price of $3.2 billion. The acquisition was funded primarily with debt proceeds of $2.8 billion and cash on hand. Please refer to the discussion under "364-Day Credit Facility" in Note 11 of the Consolidated Financial Statements for further information. Masonite is a leading global designer, manufacturer, marketer and distributor of interior and exterior doors and door systems for the residential new construction and residential repair and remodeling markets. The addition of Masonite's market-leading doors business creates a new growth platform for the Company, strengthening the Company's position in building and construction and expanding its offering of branded residential building products. Masonite's operating results and preliminary purchase price allocation have been included in the Company's newly established Doors reportable segment from May 15, 2024, the effective date of the Arrangement, within the Consolidated Financial Statements. Masonite contributed revenues of $884 million and earnings of $54 million to the Company for the period from May 15, 2024 to September 30, 2024. Please refer to Note 2 of the Consolidated Financial Statements for further information. For the three and nine months ended September 30, 2024, the Company incurred $2 million and $49 million of transaction costs, respectively, related to the Arrangement. These expenses are included in Other expense, net on the Company's consolidated statement of earnings. The fair value of the total purchase consideration transferred was determined as follows (in millions): Fair Value of Purchase Consideration Closing cash consideration $ 2,935 Pre-combination vesting portion of fair value of Masonite outstanding equity awards converted to Owens Corning time vesting RSUs 35 Repayment of Masonite term loan facility 216 Total transaction consideration $ 3,186 The closing cash as part of preliminary estimated consideration was calculated at the price of $133.00 per outstanding Masonite common share. At the close of the acquisition of Masonite, there were 22.07 million Masonite common shares outstanding. The preliminary estimated fair value of Owens Corning common stock underlying Masonite outstanding equity awards that have been converted into awards with respect to Owens Corning common stock is calculated as follows (in millions, except share and per share amounts: Amount Number of Masonite stock awards outstanding (a) 639,608 Exchange ratio (b) 0.7642 Owens Corning equity awards issued for Masonite outstanding equity awards 488,778 10-day weighted average closing share price of Owens Corning common stock (c) $ 174.03 Fair value of Owens Corning time vesting RSUs issued for Masonite outstanding equity awards $ 85 Less: Estimated fair value allocated to post-transaction compensation expense (50) Fair value of awards included in transaction consideration $ 35 (a) Represents the Masonite stock awards that have been converted into Owens Corning equity awards upon completion of the acquisition of Masonite, based on awards outstanding at May 15, 2024. Masonite equity awards include awards issued under various stock incentive plans of Masonite. (b) The exchange rate was determined by the consideration amount divided by the volume weighted average closing sale price of one share of Owens Corning common stock for the ten consecutive trading days ended May 15, 2024, in accordance with the terms of the Arrangement Agreement. (c) The ten-day weighted average closing share price was calculated for the ten consecutive trading days ended May 15, 2024, in accordance with the terms of the Arrangement Agreement. On May 15, 2024, the effective date of the Arrangement, the Company transferred consideration to Masonite to repay the Masonite 2027 term loan facility (the "Masonite term loan facility"). This repayment was required by the change in control provision within the terms of the Masonite term loan facility. The Company has applied the acquisition method of accounting in accordance with Accounting Standards Codification ("ASC") Topic 805, Business Combinations, and recognized assets acquired and liabilities assumed at their fair values as of the effective date of the Arrangement, with the excess purchase consideration recorded to goodwill. The Company has not yet finalized the valuation of the assets acquired and liabilities assumed as of September 30, 2024. The Company is continuing to obtain information to complete its valuation of certain assets and liabilities, and during the three months ended September 30, 2024, the Company recorded measurement period adjustments to the purchase price allocation. Additional adjustments may be recorded to the fair value of intangible assets, property, plant and equipment, goodwill and deferred income taxes among other items during the measurement period, a period not to exceed 12 months from the acquisition date. The following table summarizes the preliminary acquisition date fair value net of measurement period adjustments of net tangible and intangible assets acquired, net of liabilities assumed as part of the Arrangement (in millions): As originally reported Measurement period adjustments As adjusted Cash and cash equivalents $ 282 $ — $ 282 Receivables, net 330 — 330 Inventories 379 — 379 Other current assets 82 — 82 Property, plant and equipment, net 861 — 861 Operating lease right-of-use assets 253 — 253 Intangible assets 1,579 (221) 1,358 Deferred income taxes 14 — 14 Other non-current assets 91 — 91 Total assets 3,871 (221) 3,650 Accounts payable 196 — 196 Current operating lease liabilities 28 — 28 Other current liabilities 187 (3) 184 Long-term debt 867 — 867 Non-current operating lease liabilities 235 — 235 Deferred income taxes 413 (56) 357 Other non-current liabilities 32 3 35 Net assets acquired 1,913 (165) 1,748 Non-controlling interest (35) — (35) Goodwill 1,308 165 1,473 Total net assets acquired $ 3,186 $ — $ 3,186 The details on the methodology and significant inputs used for fair value of valuation are outlined below. Goodwill Preliminary purchase consideration allocation resulted in $1.5 billion in goodwill. During the three months ended September 30, 2024 the Company increased the value of goodwill by $165 million as a result of measurement period adjustments. The goodwill is not deductible for tax purposes. The factors contributing to the recognition of the amount of goodwill are based on several strategic and synergistic benefits that are expected to be realized from the acquisition. Receivables The fair value of receivables acquired is $330 million, with the gross contractual amount being $331 million. The Company expects $1 million to be uncollectible. Inventory The fair value of inventory was determined by the market selling price of the inventory, less the remaining manufacturing and selling costs and a normal profit margin on those manufacturing and selling efforts. The fair value of inventory has been stepped up by $18 million, this amount has been fully amortized to Cost of Sales as the inventory was sold. Property, Plant and Equipment The preliminary fair value of property, plant and equipment is $861 million and was determined using cost and market approaches. The cost approach reflects the amount that would be required to replace the asset to service capacity, this approach was used where there was historical data available. Where there was not historical data available the market approach was used, this approach reflects recent sales of identical or comparable assets. Intangible Assets The preliminary fair value of acquired intangible assets is $1.4 billion. During the three months ended September 30, 2024, the Company reduced the value of acquired intangibles by $221 million, as we continue to obtain information used to determine the fair value during the measurement period. There were no material impacts to the Consolidated Statements of Earnings as a result of this adjustment. The fair value of customer relationships was determined using the multi-period excess earnings method. Key assumptions under this method are future cash flow estimates, customer attrition, discount rate, contributory asset charges and tax amortization benefits. The fair value of trade names were determined using the relief from royalty method. Key assumptions under this method are future cash flow estimates, royalty rate, discount rate and tax amortization benefits. Estimated Useful Life (in years) Preliminary Estimated Asset Fair Value Customer relationships 10 - 21 $ 979 Technology 5 120 Trademarks and trade names (indefinite-lived) Indefinite 240 Trademarks and trade names 10 19 Identifiable intangible assets, net $ 1,358 Debt The fair value of Masonite's unsecured senior notes was determined using the market approach, based on the trading value of the notes in the market. Joint Ventures and Non-Controlling Interests The Company's acquisition of Masonite included joint ventures with Dominance Industries, Inc., 45% owned, and Vanair Design Inc., 30% owned as well as a 25% non-controlling interest in Sacopan Inc. owned by a third party and a 50% non-controlling interest in Magna Foremost SDN BHD owned by a third party. The value of these investments and non-controlling interests were determined using an equally weighted value from the income approach and the market approach. Pro Forma Financial Information The following table summarizes, on an unaudited pro forma basis, the combined results of operations of the Company for the three months ended and the nine months ended September 30, 2024 and 2023, assuming the acquisition had occurred on January 1, 2023 (in millions). Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Net sales $ 3,046 $ 3,099 $ 9,035 $ 9,275 Net earnings $ 327 $ 339 $ 1,004 $ 993 The pro forma financial information includes certain adjustments to adhere to the Company's accounting policies and adjustments to the historical results with pro forma adjustments, net of tax, that assume the acquisition occurred on January 1, 2023. This includes removing the results of the Architectural segment that was sold by Masonite prior to the close of the Arrangement, an adjustment to cost of goods sold to expense the step-up of inventory to fair value, increased depreciation expense to reflect the fair value of property, plant and equipment, and increased amortization expense related to the fair value of identifiable amortizable intangible assets. Adjustments were also made to recognize transaction costs incurred by the Company in the beginning of the comparative pro forma period and remove Masonite transaction costs. In addition, adjustments were made to reflect the interest and financing costs of the 364-Day Credit Facility (as defined below) used to fund the purchase price, and the interest, discount amortization, and capitalized financing cost amortization for the 2027, 2034 and 2054 senior notes that were issued to pay off the 364-Day Credit Facility in the comparative pro forma period, see Note 11 for further detail. Finally, adjustments were made to remove interest expense for the pro forma period related to the Masonite term loan facility that was paid off at closing as part of the consideration for the Arrangement. Significant adjustments to the pro forma financial information are as follows: 1. Net sales were decreased for the three months ended September 30, 2023 by $83 million and for the nine months ended September 30, 2023 and 2024 by $268 million and $119 million, respectively, to remove the sales of the Architectural segment that was sold by Masonite prior to the close of the Arrangement. 2. Net earnings were decreased by $19 million for the three months ended September 30, 2023 and by $68 million and $14 million for the nine months ended September 30, 2023 and 2024, respectively, to reflect increased amortization expense related to the fair value of identified amortizable intangible assets. 3. Net earnings were adjusted by $56 million, for the nine months ended September 30, 2024, to remove transaction costs incurred by Masonite. 4. Net earnings were increased for the three months ended September 30, 2024 by $2 million and were adjusted by $49 million each, for the nine months ended September 30, 2023 and 2024, to move transaction costs incurred by the Company to the beginning of the comparative period. 5. Net earnings were decreased by $29 million for the three months ended September 30, 2023 and by $78 million and $49 million for the nine months ended September 30, 2023 and 2024, respectively, to reflect the interest expense, discount amortization, and capitalized financing cost amortization for the 2027, 2034 and 2054 senior notes that were issued to pay off the 364-Day Credit Facility. 6. Net earnings were increased by $14 million and decreased by $2 million for the three months ended September 30, 2023 and 2024, respectively, to give effect to the tax impact of pro forma adjustments. Net earnings were increased by $60 million and decreased by $88 million for the nine months ended September 30, 2023 and 2024, respectively, to give effect to the tax impact of pro forma adjustments. The pro forma financial information does not reflect any anticipated synergies or dis-synergies, operating efficiencies or cost savings that may result from the Arrangement and integration costs that may be incurred.

DIVESTITURES

DIVESTITURES	9 Months Ended
DIVESTITURES	Sep. 30, 2024
Discontinued Operations and Disposal Groups [Abstract]
DIVESTITURES	DIVESTITURES On March 3, 2023, the Company finalized the sale of its Insulation site in Santa Clara, California for total proceeds of $234 million, net of transaction fees. Total proceeds included a non-refundable deposit of $50 million received in the third quarter of 2021. As a result of this sale, the Company recognized a pre-tax gain of $189 million in the first quarter of 2023, which is recorded in Gain on sale of site on the Consolidated Statements of Earnings.

WARRANTIES

WARRANTIES	9 Months Ended
WARRANTIES	Sep. 30, 2024
Product Warranties Disclosures [Abstract]
WARRANTIES	WARRANTIES The Company records a liability for warranty obligations at the date the related products are sold. Adjustments are made as new information becomes available. Please refer to Note 1 of our 2023 Form 10-K for information about our separately-priced extended warranty contracts. A reconciliation of the warranty liability is as follows (in millions): Nine Months Ended September 30, 2024 2023 Beginning balance $ 97 $ 88 Amounts accrued for current year 15 18 Acquired obligations 4 — Settlements of warranty claims (17) (10) Ending balance $ 99 $ 96

RESTRUCTURING, ACQUISITION AND

RESTRUCTURING, ACQUISITION AND DIVESTITURE-RELATED COSTS	9 Months Ended
RESTRUCTURING, ACQUISITION AND DIVESTITURE-RELATED COSTS	Sep. 30, 2024
Restructuring and Related Activities [Abstract]
RESTRUCTURING, ACQUISITION AND DIVESTITURE-RELATED COSTS	RESTRUCTURING, ACQUISITION AND DIVESTITURE-RELATED COSTS The Company may incur restructuring, transaction and integration costs related to acquisitions and divestitures, and may incur restructuring and other exit costs in connection with its global cost reduction, product line and productivity initiatives and the Company’s growth strategy. ACQUISITION-RELATED TRANSACTION COSTS During the first nine months of 2024, the Company incurred $49 million of transaction costs related to its recently completed acquisition of Masonite. Please refer to Note 7 of the Consolidated Financial Statements for further information. ACQUISITION-RELATED INTEGRATION COSTS During the first nine months of 2024, the Company incurred $74 million of integration costs related to its recently completed acquisition of Masonite. Please refer to Note 7 of the Consolidated Financial Statements for further information. RESTRUCTURING RELATED COSTS Acquisition-Related Restructuring Following the acquisition of Masonite, within the Company's Doors segment, the Company took actions to realize expected synergies from the newly acquired operations. During the nine months ended 2024, the Company recorded $45 million of charges, of which $23 million were non-cash charges, primarily related to the accelerated vesting of equity awards and $22 million of cash charges, primarily related to severance. The Company is continuing to review synergies as a result of this acquisition and expects to incur a material amount of incremental costs throughout 2024 and into future years. Global Composites Restructuring In December 2023, the Company took actions to reduce costs throughout its global Composites segment given current market conditions, primarily through global workforce reductions, as well as streamlining manufacturing and supply chain operations. These actions primarily include salaried workforce reductions and the relocation of the Changzhou, China operations to Hangzhou, China. In connection with these actions, the Company estimates it will incur cash charges in the range of $20 million to $30 million, primarily related to severance and other exit costs, including termination costs, and non-cash charges in the range of $15 million to $20 million, primarily related to accelerated depreciation. During the first nine months of 2024, the Company recorded $10 million of charges, of which $8 million were non-cash charges, primarily related to accelerated depreciation and $2 million of cash charges, primarily related to severance and other exit costs. Protective Packaging Exit In May 2023, the Company made the decision to exit the Protective Packaging business within the Roofing segment, including the production and sale of wood packaging, metal packaging and custom products. Exiting Protective Packaging allowed the Company to focus resources on the growth of its building materials products, which supports the future growth aspirations of the enterprise. With the exit of the Protective Packaging business, the Company closed its plants in Dorval, Quebec and Mission, British Columbia, Canada. The Company also ceased operations at its Qingdao, China facility. In connection with the exit of the Protective Packaging business, the Company estimates that it will incur cash charges of approximately $15 million, primarily related to severance and other exit costs. Additionally, the Company expects to incur total non-cash charges in the range of $70 million to $75 million, primarily related to accelerated depreciation of property, plant and equipment and accelerated amortization of definite-lived intangibles. During the first nine months of 2024, the Company recorded $4 million of charges, primarily related to other exit costs. The Company does not expect to recognize significant incremental costs related to these actions. Wabash Facility Closure In April 2023, the Company took actions to support its strategy to operate a flexible and cost-efficient manufacturing network through decisions to relocate the Wabash, Indiana mineral wool operations to Joplin, Missouri, and to exit the U.S. granulated mineral wool market. These actions resulted in cumulative costs of approximately $30 million in 2023, primarily related to severance and accelerated depreciation. During the first nine months of 2024, the Company did not incur any charges relating to this project. The Company does not expect to incur any future charges. European Operating Structure Optimization In March 2023, the Company took actions to optimize the operating structure of its segments across Europe to increase its competitiveness. These actions are expected to result in cumulative costs of approximately $20 million, primarily related to severance and other exit costs. During the first nine months of 2024, the Company recorded $3 million of charges primarily related to severance. The Company does not expect to recognize significant incremental costs related to these actions. Composites Strategic Realignment Actions On July 1, 2022, the Company finalized the sale of the European portion of the DUCS product line located in Chambéry, France, within the Composite’s segment. The Company recorded a pre-tax charge of $30 million in Other expense, net on the Consolidated Statements of Earnings in 2022 to reflect the fair value less cost to sell the assets. The Company also took actions to convert the DUCS manufacturing facilities located in Anderson, South Carolina and Kimchon, Korea to produce other glass fiber products needed to support our growth strategy in building and construction applications. During the first nine months of 2024, the Company did not incur any charges relating to this project and does not expect any future charges. Roofing Restructuring Actions In December 2021, the Company took actions to restructure operations within the Roofing segment’s components product line by relocating production assets from China to India, which allowed the business to optimize its manufacturing network and support a tariff mitigation strategy. During the first nine months of 2024, the Company did not incur any charges relating to this project and does not expect any further charges. Santa Clara Insulation Site During the third quarter of 2021, the Company entered into a sales agreement for the Company’s Insulation site in Santa Clara, California, as part of the Company’s ongoing strategy to operate a flexible, cost-efficient manufacturing network and geographically locate its assets to better serve its customers. On March 3, 2023, the Company finalized the sale of this site for total proceeds of $234 million, net of transaction fees. Total proceeds included a non-refundable deposit of $50 million received in the third quarter of 2021. During the first nine months of 2024, the Company did not incur any charges relating to this project and does not expect any further charges. Consolidated Statements of Earnings Classification The following table presents the impact and respective location of total restructuring, acquisition and divestiture-related costs on the Consolidated Statements of Earnings, which are included within Corporate, Other and Eliminations (in millions): Three Months Ended September 30, Nine Months Ended September 30, Type of cost Location 2024 2023 2024 2023 Accelerated depreciation Cost of sales $ (1) $ (23) $ (8) $ (46) Other exit costs Cost of sales (1) (7) (6) (15) Other exit costs Marketing and administrative expenses — — (1) (1) Severance Other expense, net 1 — (47) (25) Other exit costs Other expense, net — — — (1) Accelerated amortization Other expense, net — (11) — (18) Acquisition-related transaction costs Other expense, net (2) — (49) — Acquisition-related integration costs Other expense, net (53) — (74) — Gain on sale of Santa Clara, California site Gain on sale of site — — — 189 Total restructuring, acquisition and divestiture-related (costs) gains $ (56) $ (41) $ (185) $ 83 Summary of Unpaid Liabilities The following table summarizes the status of the unpaid liabilities from the Company’s restructuring activities (in millions): September 30, 2024 Acquisition-related Restructuring Global Composites Restructuring Protective Packaging Exit Wabash Facility Closure European Operating Structure Optimization Balance at December 31, 2023 $ — $ 12 $ 1 $ 3 $ 6 Restructuring costs 45 10 4 — 3 Payments (21) (4) (3) (3) (4) Accelerated depreciation and other non-cash items (23) (8) (2) — — Balance at September 30, 2024 $ 1 $ 10 $ — $ — $ 5 Cumulative charges incurred $ 45 $ 26 $ 82 $ 33 $ 15 As of September 30, 2024, the remaining liability balance was comprised of $16 million, inclusive of $2 million of non-current severance and $14 million of severance the Company expects to pay over the next twelve months. September 30, 2023 Protective Packaging Exit Wabash Facility Closure European Operating Structure Optimization Composites Strategic Realignment Actions Roofing Restructuring Actions Santa Clara Insulation Site Balance at December 31, 2022 $ — $ — $ — $ 1 $ — $ 7 Restructuring costs 61 23 12 3 2 5 Payments — — (4) (3) (2) (11) Accelerated depreciation and other non-cash items (49) (20) — — — (1) Balance at September 30, 2023 $ 12 $ 3 $ 8 $ 1 $ — $ — Cumulative charges incurred $ 61 $ 23 $ 12 $ 12 $ 10 $ 65

DEBT

DEBT	9 Months Ended
DEBT	Sep. 30, 2024
Debt Disclosure [Abstract]
DEBT	DEBT Details of the Company’s outstanding long-term debt, as well as the fair values, are as follows (in millions): September 30, 2024 December 31, 2023 Carrying Value Fair Value Carrying Value Fair Value 4.200% senior notes, net of discount and financing fees, due 2024 $ 400 100 % $ 399 99 % 3.400% senior notes, net of discount and financing fees, due 2026 399 99 % 398 96 % 5.500% senior notes, net of discount and financing fees, due 2027 497 103 % N/A N/A 5.375% senior notes, net of discount and financing fees, due 2028 29 100 % N/A N/A 3.950% senior notes, net of discount and financing fees, due 2029 447 98 % 447 95 % 3.500% senior notes, net of discount and financing fees, due 2030 2 89 % N/A N/A 3.500% senior notes, net of discount and financing fees, due 2030 336 95 % N/A N/A 3.875% senior notes, net of discount and financing fees, due 2030 298 97 % 298 94 % 5.700% senior notes, net of discount and financing fees, due 2034 789 106 % N/A N/A 7.000% senior notes, net of discount and financing fees, due 2036 369 117 % 369 116 % 4.300% senior notes, net of discount and financing fees, due 2047 589 85 % 589 88 % 4.400% senior notes, net of discount and financing fees, due 2048 391 85 % 391 87 % 5.950% senior notes, net of discount and financing fees, due 2054 683 106 % N/A N/A Various finance leases, due through 2050 (a) 236 100 % 154 100 % Other — N/A 1 N/A Total long-term debt 5,465 N/A 3,046 N/A Less – current portion of senior notes 400 100 % 399 99 % Less – current portion of finance leases and other (a) 37 100 % 32 100 % Long-term debt, net of current portion $ 5,028 N/A $ 2,615 N/A (a) The Company determined that the book value of the above noted long-term debt instruments approximates fair value. The fair values of the Company’s outstanding long-term debt instruments were estimated using market observable inputs, including quoted prices in active markets, market indices and interest rate measurements. Within the hierarchy of fair value measurements, these are Level 2 fair values. Senior Notes The Company issued $500 million of 2027 senior notes with an annual interest rate of 5.500%, $800 million of 2034 senior notes with an annual interest rate of 5.700% and $700 million of 2054 senior notes with an annual interest rate of 5.950% on May 31, 2024. These senior notes are net of discounts and issuance costs of $4 million, $11 million and $17 million, respectively. The proceeds from these notes were used to repay a portion of the outstanding borrowings under the 364-Day Credit Facility (as defined below) that was used to fund a portion of the purchase of Masonite in the second quarter of 2024 and to pay related fees and expenses. On May 1, 2024, in connection with the acquisition of Masonite, we commenced an offer to exchange (the “Exchange Offer”) any and all of Masonite’s outstanding 3.50% Senior Notes due 2030 (the “Masonite 2030 notes”) for new 3.50% Senior Notes due 2030 of Owens Corning (the “Owens Corning 2030 notes”). On May 22, 2024, 99.51% of the outstanding Masonite 2030 notes were exchanged and we issued $373 million aggregate principal amount of Owens Corning 2030 notes, which was a non-cash financing transaction for the Company. Interest on the notes is payable semiannually in arrears on February 15 and August 15 each year, beginning on August 15, 2024. Following the settlement of the Exchange Offer, approximately $2 million of the Masonite 2030 notes that were not exchanged remain outstanding, which has been recorded on the Consolidated Balance Sheets. On April 15, 2024, in connection with the acquisition of Masonite, we commenced a tender offer (the “Tender Offer”) to purchase any and all of Masonite's outstanding 5.375% Senior Notes due 2028 (the “Masonite 2028 notes”) with an aggregate value of $501 million. On May 13, 2024, 94.25% of the outstanding Masonite 2028 notes were validly tendered, with Owens Corning making a cash payment on May 16, 2024 of approximately $480 million, inclusive of $7 million of interest and $1 million premium on tender. Following the settlement of the Tender Offer, approximately $29 million of the Masonite 2028 notes that were not tendered remain outstanding, which has been recorded on the Consolidated Balance Sheets. Interest on the Masonite 2028 notes is payable semiannually in arrears on February 1 and August 1 each year. The Company issued $300 million of 2030 senior notes on May 12, 2020. Interest on the notes is payable semiannually in arrears on June 1 and December 1 each year, beginning on December 1, 2020. The proceeds from these notes were used for general corporate purposes. The Company issued $450 million of 2029 senior notes on August 12, 2019. Interest on the notes is payable semiannually in arrears on February 15 and August 15 each year, beginning on February 15, 2020. The proceeds from these notes were used to repay $416 million of our 2022 senior notes and $34 million of our 2036 senior notes. The Company issued $400 million of 2048 senior notes on January 25, 2018. Interest on the notes is payable semiannually in arrears on January 30 and July 30 each year, beginning on July 30, 2018. The proceeds from these notes were used, along with borrowings on a $600 million term loan commitment and borrowings on the Receivables Securitization Facility (as defined below), to fund the purchase of Paroc in the first quarter of 2018. The Company issued $600 million of 2047 senior notes on June 26, 2017. Interest on the notes is payable semiannually in arrears on January 15 and July 15 each year, beginning on January 15, 2018. A portion of the proceeds from these notes was used to fund the purchase of Pittsburgh Corning in 2017 and for general corporate purposes. The remaining proceeds were used to repay $144 million of our 2019 senior notes and $140 million of our 2036 senior notes. The Company issued $400 million of 2026 senior notes on August 8, 2016. Interest on the notes is payable semiannually in arrears on February 15 and August 15 each year, beginning on February 15, 2017. A portion of the proceeds from these notes was used to repay $158 million of our 2016 senior notes. The remaining proceeds were used to pay down portions of our Receivables Securitization Facility and for general corporate purposes. The Company issued $400 million of 2024 senior notes on November 12, 2014. Interest on the notes is payable semiannually in arrears on June 1 and December 1 each year, beginning on June 1, 2015. A portion of the proceeds from these notes was used to repay $242 million of our 2016 senior notes and $105 million of our 2019 senior notes. The remaining proceeds were used to pay down our Senior Revolving Credit Facility (as defined below), finance general working capital needs, and for general corporate purposes. As of September 30, 2024, the $400 million outstanding principal related to the 2024 senior notes was recorded in Long-term debt - current portion on the Consolidated Balance Sheets. The Company issued $550 million of 2036 senior notes on October 31, 2006. Interest on the notes is payable semiannually in arrears on June 1 and December 1 each year, beginning on June 1, 2007. The proceeds of these notes were used to pay certain unsecured and administrative claims, finance general working capital needs and for general corporate purposes. Collectively, the Company's senior notes above, other than the Masonite 2028 notes or the Masonite 2030 notes, are referred to as the “Senior Notes.” The Senior Notes are general unsecured obligations of the Company and rank pari passu with all existing and future senior unsecured indebtedness of the Company. The 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, 2024. Senior Revolving Credit Facility On March 1, 2024, the Company entered into an amended and restated senior revolving credit facility (the “Senior Revolving Credit Facility”) to increase the available principal amount from $800 million to $1.0 billion and to extend the maturity to March 2029. 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, federal funds rate plus a spread or forward-looking term rate based on the Secured Overnight Financing Rate (“Term SOFR”) plus a spread. The Senior Revolving Credit Facility contains various covenants, including a maximum allowed leverage 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, 2024. Please refer to the Credit Facility Utilization section below for liquidity information as of September 30, 2024. Receivables Securitization Facility For the receivables securitization facility (the "Receivables Securitization Facility"), the Company has a Receivables Purchase Agreement (“RPA”) that is 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 an RPA with certain financial institutions. On March 1, 2024, the Company amended and restated the RPA to increase the facility limit from $280 million to $300 million and to extend the scheduled maturity date to February 2025. Under the RPA, the Company has the ability to borrow at the lenders’ cost of funds, which approximates Term SOFR plus a spread; alternatively, the Company may borrow at the higher of the United States prime rate or the Overnight Bank Funding Rate plus a spread. The RPA contains various covenants, including a maximum allowed leverage 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, 2024. Please refer to the Credit Facility Utilization section below for liquidity information as of September 30, 2024. 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. On May 15, 2024, the Company initially borrowed $295 million on the Receivables Securitization Facility, which was used to pay down a portion of the 364-Day Credit Facility. Subsequent to the May 15, 2024 borrowing, the Company repaid and re-borrowed on the Receivables Securitization Facility throughout the second and third quarter to pay down portions of the 364-Day Credit Facility. As of September 30, 2024, there is no outstanding balance on the Receivables Securitization Facility. Please refer to the Credit Facility Utilization section below for liquidity information as of September 30, 2024. 364-Day Credit Facility On March 1, 2024, the Company entered into an unsecured term loan agreement in an aggregate principal amount of $3.0 billion, which matures 364 days after the facility is initially funded with a single drawing (the “364-Day Credit Facility”). In May 2024, to fund a portion of the purchase of Masonite, the Company borrowed $2.8 billion using Term SOFR plus a spread on the 364-Day Credit Facility. As a result of the borrowing, the Company incurred approximately $16 million of financing fees which were amortized to Interest expense, net on the Consolidated Statements of Earnings. During the second quarter, the Company completely repaid the 364-Day Credit Facility with a combination of issuance of new senior notes, borrowings on the Receivables Securitization Facility and cash on hand. Based on terms of the agreement, no further amounts can be drawn. The following table shows how the Company utilized its primary sources of liquidity (in millions): Balance at September 30, 2024 Senior Revolving Credit Facility Receivables Securitization Facility Facility size or borrowing limit $ 1,000 $ 300 Collateral capacity limitation on availability N/A — Outstanding borrowings — — Outstanding letters of credit 4 1 Availability on facility $ 996 $ 299 Short-Term Debt Short-term borrowings were less than $1 million and $1 million as of September 30, 2024 and December 31, 2023, respectively. Short-term borrowings consisted of various operating lines of credit. The weighted average interest rate on all short-term borrowings was approximately 4.0% and 5.1% as of September 30, 2024 and December 31, 2023, respectively.

PENSION PLANS AND OTHER POSTRET

PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS	9 Months Ended
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS	Sep. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS	PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS Pension Plans The Company sponsors defined benefit pension plans. Under the plans, pension benefits are based on an employees’ 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. plans, the unrecognized cost of any retroactive amendments and actuarial gains and losses are amortized over the average remaining life expectancy of the inactive participants as substantially all of the plan participants are inactive. In 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. The following table presents the components of net periodic pension cost (in millions): Three Months Ended September 30, 2024 2023 U.S. Non-U.S. Total U.S. Non-U.S. Total Components of Net Periodic Pension Cost Service cost $ 1 $ — $ 1 $ 1 $ — $ 1 Interest cost 4 3 7 8 4 12 Expected return on plan assets (5) (3) (8) (10) (4) (14) Amortization of actuarial loss 1 1 2 1 1 2 Net periodic pension cost $ 1 $ 1 $ 2 $ — $ 1 $ 1 Nine Months Ended September 30, 2024 2023 U.S. Non-U.S. Total U.S. Non-U.S. Total Components of Net Periodic Pension Cost Service cost $ 2 $ 2 $ 4 $ 2 $ 2 $ 4 Interest cost 13 10 23 24 12 36 Expected return on plan assets (17) (10) (27) (30) (11) (41) Amortization of actuarial loss 2 3 5 4 2 6 Net periodic pension cost $ — $ 5 $ 5 $ — $ 5 $ 5 The Company expects to contribute $20 million in cash to its defined benefit pension plans during 2024. Actual contributions to the plans may change as a result of a variety of factors, including changes in laws that impact funding requirements. The Company made cash contributions of $4 million to its defined benefit pension plans during the nine months ended September 30, 2024. Postemployment and Postretirement Benefits Other than Pensions (“OPEB”) 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 postretirement benefit income for U.S. plans for the periods indicated (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Components of Net Periodic Postretirement Benefit Income Service cost $ — $ — $ — $ — Interest cost 1 1 4 4 Amortization of actuarial gain (2) (2) (6) (6) Net periodic postretirement benefit income $ (1) $ (1) $ (2) $ (2) There was no significant net periodic postretirement income attributable to non-U.S. plans.

CONTINGENT LIABILITIES AND OTHE

CONTINGENT LIABILITIES AND OTHER MATTERS	9 Months Ended
CONTINGENT LIABILITIES AND OTHER MATTERS	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
CONTINGENT LIABILITIES AND OTHER MATTERS	CONTINGENT LIABILITIES AND OTHER MATTERS The Company may be involved in various legal and regulatory proceedings relating to employment, antitrust, tax, product liability, environmental, contracts, intellectual property 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. Except as set forth below under “Litigation and Regulatory Proceedings,” 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”), are not material to the Company’s financial statements. While the likelihood is remote, the disposition of the Proceedings and Environmental Matters could have a material impact on the results of operations, cash flows or liquidity in any given reporting period. Litigation and Regulatory Proceedings The Company is involved in litigation and regulatory proceedings from time to time in the regular course of its business. The Company believes that adequate provisions for resolution of all contingencies, claims and pending matters have been made for probable losses that are reasonably estimable. During the second quarter of 2023, the Company’s subsidiary, Paroc Group OY (“Paroc”), which the Company acquired in 2018, notified the appropriate European maritime regulatory authorities that specific products in its marine insulation product line may not meet certain fire safety requirements in accordance with their certifications. Paroc voluntarily withdrew these specific products from the market, issued recalls, and suspended distribution and sales of these products (the “Recalled Products”). Paroc continues to cooperate with the applicable regulatory and government authorities and work with its customers and end-users to assist with remediation for the recall. During the first quarter of 2024, the Company discovered potential nonconformances relating to two other marine insulation product lines. In April 2024, Paroc suspended sales of these marine insulation products as a precautionary measure while it reviews the potential nonconformances, but has not issued recalls. The Company has included an estimated liability for expected future costs related to the Recalled Products on its Consolidated Balance Sheets as of September 30, 2024 and December 31, 2023. The estimated liability is primarily based on assumptions related to the estimated costs of the remedy for the Recalled Products. At this time, we cannot estimate a range of loss for any additional costs related to the Recalled Products that exceed the current estimated liability. We reevaluate these assumptions each period, and the related liability may be adjusted when factors indicate that the liability is either not sufficient to cover or exceeds the estimated costs related to the Recalled Products. Based on the factors currently known, we believe the appropriate liability has been established at this time. It is reasonably possible that additional costs related to the Recalled Products could be incurred that exceed the estimated liability by amounts that could be material to our Consolidated Financial Statements. As part of its review of the Paroc insulation product portfolio, the Company discovered potential nonconformances relating to certain ventilation duct and steel beam insulation products. In January and September 2024, Paroc suspended sales of the affected insulation products as a precautionary measure while it reviews the potential nonconformances, but has not issued recalls. We expect to incur costs associated with the resolution of this matter. The amount or range of any potential loss cannot be reasonably estimated at this time. The Company is continuing its review. Environmental Matters The Company has established policies and procedures designed to ensure that its operations are conducted in compliance with all relevant laws and regulations and that enable the Company to meet its high standards for corporate sustainability and environmental stewardship. Our manufacturing facilities are subject to numerous foreign, federal, state and local laws and regulations relating to the presence of hazardous materials, pollution and protection of the environment, including emissions to air, reductions of greenhouse gases, discharges to water, management of hazardous materials, handling and disposal of solid wastes, use of chemicals in our manufacturing processes, and remediation of contaminated sites. All Company manufacturing facilities are either ISO 14001 certified or deploy environmental management systems based on ISO 14001 principles. The Company’s 2030 Sustainability Goals include significant global reductions in energy use, water consumption, waste to landfill, and emissions of greenhouse gases, fine particulate matter, and volatile organic air emissions, and protection of biodiversity. Owens Corning is involved in remedial response activities and is responsible for environmental remediation at a number of sites, including certain of its currently owned or formerly owned plants. These responsibilities arise under a number of laws, including, but not limited to, the Federal Resource Conservation and Recovery Act, and similar state or local laws pertaining to the management and remediation of hazardous materials and petroleum. The Company has also been named a potentially responsible party under the U.S. Federal Superfund law, similar state or local laws pertaining to the management and remediation of hazardous materials and petroleum. The Company became involved in these sites as a result of government action or in connection with business acquisitions. As of September 30, 2024, the Company was involved with a total of 23 sites worldwide, including 9 Superfund and state or country equivalent sites and 14 owned or formerly owned sites. None of the liabilities for these sites are individually significant to the Company. Remediation activities generally involve a potential range of activities and costs related to soil, groundwater, and sediment contamination. This can include pre-cleanup activities such as fact-finding and investigation, risk assessment, feasibility studies, remedial action design and implementation (where actions may range from monitoring to removal of contaminants, to installation of longer-term remediation systems). A number of factors affect the cost of environmental remediation, including the number of parties involved in a particular site, the determination of the extent of contamination, the length of time the remediation may require, the complexity of environmental regulations, variability in clean-up standards, the need for legal action, and changes in remediation technology. Taking these factors into account, Owens Corning reasonably estimates the costs of remediation to be paid over a period of years. The Company accrues an amount on an undiscounted basis, when a liability is probable and reasonably estimable. Actual cost may differ from these estimates for the reasons mentioned above. At September 30, 2024, the Company had an accrual totaling $4 million for these costs, of which the current portion is $2 million. Changes in required remediation procedures or timing of those procedures, or discovery of contamination at additional sites, could result in material increases to the Company’s environmental obligations. During the first quarter of 2024, the Procuraduría Federal de Protección al Ambiente (“PROFEPA”) issued a ruling to Owens Corning Mexico, S. de R.L. de C.V., a subsidiary of the Company (“OC Mexico”), citing violations of Mexico’s air emissions regulations at OC Mexico’s facility in Mexico City, Mexico and imposing monetary sanctions of approximately $1 million. OC Mexico previously performed all related corrective action and, as of the date of this report, is in compliance with applicable federal and local environmental laws. OC Mexico is in the process of appealing PROFEPA’s ruling and the resulting monetary sanctions.

STOCK COMPENSATION

STOCK COMPENSATION	9 Months Ended
STOCK COMPENSATION	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
STOCK COMPENSATION	STOCK COMPENSATION Description of the Plan On April 20, 2023, the Company’s stockholders approved the Owens Corning 2023 Stock Plan (the “2023 Stock Plan”), which authorizes grants of stock options, stock appreciation rights, stock awards (including restricted stock awards, restricted stock units and bonus stock awards), performance share awards and performance share units. At September 30, 2024, the number of shares remaining available under the 2023 Stock Plan for all stock awards was 3.0 million. Prior to the 2023 Stock Plan, employees were eligible to receive stock awards under the Owens Corning 2019 Stock Plan. Total Stock-Based Compensation Expense Stock-based compensation expense included in Marketing and administrative expenses in the accompanying Consolidated Statements of Earnings is as follows (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Total stock-based compensation expense $ 21 $ 11 $ 74 $ 38 Restricted Stock Units The Company has granted restricted stock units (“RSUs”) under its stockholder-approved stock plans. Generally, all outstanding RSUs will fully settle in stock. Compensation expense for RSUs is measured based on the closing market price of the stock at date of grant and is recognized on a straight-line basis over the vesting period, which is typically three Masonite Equity Awards On May 15, 2024, the Company converted outstanding Masonite stock-based incentive awards to Masonite employees at a 0.8 equity award exchange ratio. Masonite equity awards include outstanding and unvested awards of restricted stock units and performance stock units (“PRSUs”) under the Masonite International Corporation 2021 Omnibus Incentive Plan (“Masonite Stock Plan”) that were held by employees of Masonite, which were exchanged for time-vesting restricted stock units of Owens Corning RSUs in connection with the completion of the transactions contemplated by the Arrangement Agreement. The converted stock-based incentive awards include 0.2 million PRSUs and 0.3 million restricted stock units. The equity award exchange ratio was determined by the consideration amount of $133 per share divided by the volume weighted average closing sale price of one share of Owens Corning common stock for the ten consecutive trading days ended March 15, 2024 of $174.03 per share, in accordance with the terms of the Arrangement Agreement. In accordance with the Arrangement Agreement, the number of Masonite shares underlying the PRSUs was equal to (i) 107.33% of target for PRSUs granted in February 2022, (ii) 100% of target for PRSUs granted in August 2022 and (iii) 122% of target for PRSUs granted in February 2023. The fair value of the Owens Corning RSUs issued for Masonite outstanding equity awards was $85 million as of the date of acquisition, of which $35 million was related to pre-combination expense and was included in the purchase price. The remaining portion of $50 million relates to post-combination expense, of which $23 million was accelerated as of September 30, 2024. As of September 30, 2024, the future unrecognized expense related to the converted outstanding RSUs was approximately $20 million which will be recognized over the remaining service period of approximately 1.78 years. Please refer to Notes 7 and 10 of the Consolidated Financial Statements for further information. Future equity-based awards to Company employees who were former Masonite employees may be granted from the remaining available shares under the Masonite Stock Plan. At September 30, 2024, the number of shares remaining available under the Masonite Stock Plan was 0.6 million shares of Owens Corning common stock. The following table summarizes the Company’s RSU activity: Number of RSUs Weighted-Average Balance at December 31, 2023 1,225,668 $ 79.72 Granted 227,843 154.60 Assumed (converted Masonite equity awards) 488,778 174.03 Vested (609,245) 120.58 Forfeited (36,528) 119.20 Balance at September 30, 2024 1,296,516 $ 108.12 As of September 30, 2024, there was $65 million of total unrecognized compensation cost related to RSUs. This total includes $20 million of unrecognized compensation related to converted Masonite equity awards and $45 million related to Owens Corning Stock Plans. That cost is expected to be recognized over a weighted-average period of 1.92 years. The total grant date fair value of shares vested during the nine months ended September 30, 2024 and 2023 was $73 million and $24 million, respectively. Performance Share Units The Company has granted performance share units (“PSUs”) as a part of its long-term incentive plan. All outstanding PSUs will fully settle in stock. The amount of shares ultimately distributed from all PSUs is contingent on meeting internal company-based metrics or an external-based stock performance metric. In the nine months ended September 30, 2024, the Company granted both internal company-based and external-based metric PSUs. Internal Company-based metrics The internal Company-based metric PSUs are based on various Company metrics and typically vest after a three-year period. The amount of stock distributed will vary from 0% to 200% of PSUs awarded depending on each award’s design and performance versus the company-based metrics. The initial fair value for all internal company-based metric PSUs assumes that the performance goals will be achieved and is based on the grant date stock price. This assumption is monitored quarterly and if it becomes probable that such goals will not be achieved or will be exceeded, compensation expense recognized will be adjusted and previous surplus compensation expense recognized will be reversed or additional expense will be recognized. The expected term represents the period from the grant date to the end of the three-year performance period. Pro-rata vesting may be utilized in the case of death, disability or retirement and awards, if earned, will be paid at the end of the three-year period. The following table provides a summary of the grant date fair values of the internal Company-based metric PSUs: Nine Months Ended September 30, 2024 2023 Grant date fair value of units granted $ 147.18 $ 92.97 External-based metrics The external-based metric PSUs vest after a three-year period. Outstanding grants issued in or after 2018 until 2022 were based on the Company’s total stockholder return relative to the performance of the Dow Jones U.S. Construction & Materials Index. Outstanding grants issued in or after 2023 are based on the Company’s total stockholder return relative to a peer group. The amount of stock distributed will vary from 0% to 200% of PSUs awarded depending on the relative stockholder return performance. The fair value of external-based metric PSUs has been estimated at the grant date using a Monte Carlo simulation that uses various assumptions. The following table provides a summary of the assumptions for PSUs granted in 2024 and 2023: Nine Months Ended September 30, 2024 2023 Expected volatility 33.88% 44.66% Risk free interest rate 3.94% 3.75% Expected term (in years) 2.91 2.91 Grant date fair value of units granted $ 195.95 $ 119.33 The risk-free interest rate was based on zero-coupon United States Treasury STRIPS at the grant date. The expected term represents the period from the grant date to the end of the three-year performance period. PSU Summary As of September 30, 2024, there was $20 million total unrecognized compensation cost related to PSUs. That cost is expected to be recognized over a weighted-average period of 1.76 years. The following table summarizes the Company’s PSU activity: Number of PSUs Weighted-Average Balance at December 31, 2023 268,677 $ 100.57 Granted 95,997 161.12 Vested (9,063) 109.17 Forfeited (16,152) 105.34 Balance at September 30, 2024 339,459 $ 117.24 Employee Stock Purchase Plan The Owens Corning Employee Stock Purchase Plan (“ESPP”) is a tax-qualified plan under Section 423 of the Internal Revenue Code. The purchase price of shares purchased under the ESPP is equal to 85% of the lower of the fair market value of shares of Owens Corning common stock at the beginning or ending of the offering period, which is a six-month period ending on May 31 and November 30 of each year. On April 16, 2020, the Company’s stockholders approved the Amended and Restated Owens Corning Employee Stock Purchase Plan, which increased the number of shares available for issuance under the plan by 4.2 million shares. As of September 30, 2024, 3.1 million shares remain available for purchase. Included in total stock-based compensation expense is $2 million and $6 million of expense related to the Company’s ESPP recognized during the three and nine months ended September 30, 2024, respectively. During the three and nine months ended September 30, 2023, the Company recognized expense of $1 million and $5 million, respectively, related to the Company’s ESPP. As of September 30, 2024, there was $1 million of total unrecognized compensation cost related to the ESPP.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
EARNINGS PER SHARE	Sep. 30, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE The following table is a reconciliation of weighted-average shares for calculating basic and diluted earnings per share (in millions, except per share amounts): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Net earnings attributable to Owens Corning $ 321 $ 337 $ 905 $ 1,065 Weighted-average number of shares outstanding used for basic earnings per share 87.0 90.0 87.2 90.6 Non-vested restricted stock units and performance share units 0.9 0.9 0.8 0.9 Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share 87.9 90.9 88.0 91.5 Earnings per common share attributable to Owens Corning common stockholders: Basic $ 3.69 $ 3.74 $ 10.38 $ 11.75 Diluted $ 3.65 $ 3.71 $ 10.28 $ 11.64 For the three and nine months ended September 30, 2024 and September 30, 2023, there were no non-vested RSUs or PSUs that had an anti-dilutive effect on earnings per share. On December 1, 2022, the Board of Directors approved a new share repurchase program under which the Company is authorized to repurchase up to 10 million shares of the Company’s outstanding common stock (the “Repurchase Authorization”). The Repurchase Authorization enables the Company to repurchase shares through the open market, privately negotiated, or other transactions. The actual number of shares repurchased will depend on timing, market conditions and other factors and will be at the Company’s discretion. The Company repurchased 2.1 million shares of its common stock for $332 million, inclusive of applicable taxes, during the nine months ended September 30, 2024, under the Repurchase Authorization. As of September 30, 2024, 6.9 million shares remain available for repurchase under the Repurchase Authorization.

INCOME TAXES

INCOME TAXES	9 Months Ended
INCOME TAXES	Sep. 30, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The following table provides the Income tax expense (in millions) and effective tax rate for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Income tax expense $ 120 $ 110 $ 318 $ 361 Effective tax rate 27 % 25 % 26 % 25 % The difference between the effective tax rate and the U.S. federal statutory tax rate of 21% for the three and nine months ended September 30, 2024 is primarily due to U.S. state and local income tax expense, foreign rate differential and U.S. federal taxes on foreign earnings. The difference between the effective tax rate and the U.S. federal statutory tax rate of 21% for the three months ended September 30, 2023 is primarily due to U.S. state and local income tax expense, offset slightly by U.S. federal taxes on foreign earnings and U.S. federal income tax credits. The difference between the effective tax rate and the U.S. federal statutory tax rate of 21% for the nine months ended September 30, 2023 is primarily due to U.S. state and local income tax expense and foreign rate differential. The Company continues to assert indefinite reinvestment in accordance with ASC 740 based on the laws as of enactment of the tax legislation.

CHANGES IN ACCUMULATED OTHER CO

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE DEFICIT	9 Months Ended
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE DEFICIT	Sep. 30, 2024
Equity [Abstract]
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE DEFICIT	CHANGES IN ACCUMULATED OTHER COMPREHENSIVE DEFICIT The following table summarizes the changes in accumulated other comprehensive income (deficit) (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Currency Translation Adjustment Beginning balance $ (421) $ (339) $ (318) $ (380) Gain (loss) on foreign currency translation 69 (73) (34) (32) Other comprehensive income (loss), net of tax 69 (73) (34) (32) Ending balance $ (352) $ (412) $ (352) $ (412) Pension and Other Postretirement Adjustment Beginning balance $ (197) $ (304) $ (196) $ (301) Amounts reclassified from AOCI to net earnings, net of tax (a) — — (1) — Amounts classified into AOCI, net of tax (4) 2 (4) (1) Other comprehensive (loss) income, net of tax (4) 2 (5) (1) Ending balance $ (201) $ (302) $ (201) $ (302) Hedging Adjustment Beginning balance $ 21 $ 6 $ 11 $ — Amounts reclassified from AOCI to net earnings, net of tax (b) 2 8 12 32 Amounts classified into AOCI, net of tax (1) (3) (1) (21) Other comprehensive income, net of tax 1 5 11 11 Ending balance $ 22 $ 11 $ 22 $ 11 Total AOCI ending balance $ (531) $ (703) $ (531) $ (703) (a) These AOCI components are included in the computation of total Pension and Other postretirement expense and are recorded in Non-operating income. See Note 12 for additional information. (b) Amounts reclassified from (loss) gain on cash flow hedges are reclassified from AOCI to income when the hedged item affects earnings and is recognized in Cost of sales or Interest expense, net depending on the hedged item. See Note 4 for additional information.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	9 Months Ended
SUBSEQUENT EVENTS	Sep. 30, 2024
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On November 4, 2024, the Company entered into an agreement to sell its building materials business in China and Korea to a member of the business’s management team. The transaction includes six insulation manufacturing facilities in China and a roofing manufacturing facility in Korea. The building materials business, within the Insulation segment, represents annual revenues of approximately $130 million. The transaction is expected to close mid-2025 and result in a loss that cannot be estimated at this time.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended						9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss) Attributable to Parent	$ 321	$ 285	$ 299	$ 337	$ 345	$ 383	$ 905	$ 1,065

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	9 Months Ended
Insider Trading Arrangements	Sep. 30, 2024 shares	Sep. 30, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
José Méndez-Andino [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On August 20, 2024, José Méndez-Andino, the Company's Executive Vice President, Chief Research and Development Officer, entered into a written plan for the sale of up to 5,196 shares of Company common stock, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. This plan is scheduled to terminate no later than August 8, 2025.
Name	José Méndez-Andino
Title	Executive Vice President, Chief Research and Development Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 20, 2024
Expiration Date	August 8, 2025
Arrangement Duration	353 days
Aggregate Available	5,196	5,196
Gunner Smith [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On September 13, 2024, Gunner Smith, the Company's President, Roofing, entered into a written plan for the sale of up to 17,450 shares of Company common stock, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. This plan is scheduled to terminate no later than September 5, 2025.
Name	Gunner Smith
Title	President, Roofing
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 13, 2024
Expiration Date	September 5, 2025
Arrangement Duration	357 days
Aggregate Available	17,450	17,450

GENERAL (Policies)

GENERAL (Policies)	9 Months Ended
GENERAL (Policies)	Sep. 30, 2024
Accounting Changes and Error Corrections [Abstract]
Accounting Pronouncements	Accounting Pronouncements The following table summarizes recent Accounting Standard Updates ("ASU") issued by the Financial Accounting Standards Board ("FASB") that could have an impact on the Company's Consolidated Financial Statements: Standard Description Effective Date for Company Effect on the Recently issued standards: ASU 2024-01 "Compensation - Stock Compensation" (Topic 718): Scope Application of Profits Interest and Similar Awards This amendment adds an illustrative example to demonstrate how an entity should apply the scope guidance in paragraph 718-10-15-3 to determine whether profits interest and similar awards should be accounted for in accordance with Topic 718. Fiscal years beginning after December 15, 2024 We do not believe the adoption of this guidance will have a material effect on our Consolidated Financial Statements. ASU 2024-02 "Codification Improvements - Amendments to Remove References to the Concepts Statements" Amendments in this update remove references to various FASB Concepts Statements. Fiscal years beginning after December 15, 2024 We do not believe the adoption of this guidance will have a material effect on our Consolidated Financial Statements. ASU 2024-03 "Income Statement – Reporting Comprehensive Income- Expense Disaggregation Disclosures (Subtopic 220-40)" The amendments in this update require disclosure, in the notes to financial statements, of specified information about certain costs and expenses. Fiscal years beginning after December 15, 2026 We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statements. We do not believe the adoption of this guidance will have a material effect on our results of operations. ASU 2023-06 “Disclosure Improvements” The amendments in this update modify the disclosure or presentation requirements of a variety of Topics. The effective date for each topic is contingent on future SEC rule setting. We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statement disclosures. We do not believe the adoption of this guidance will have a material effect on our results of operations. ASU 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” The amendments in this update improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. Fiscal years beginning after December 15, 2023 We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statement disclosures. We do not believe the adoption of this guidance will have a material effect on our results of operations. ASU 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” This standard modifies the rate reconciliation and income taxes paid disclosures by requiring consistent categories and greater disaggregation of information in the rate reconciliation, as well as requiring income taxes paid to be disaggregated by jurisdiction. Fiscal years beginning after December 15, 2024 We are currently assessing the impact adopting this standard will have on our Consolidated Financial Statements. We do not believe the adoption of this guidance will have a material effect on our results of operations.

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
SEGMENT INFORMATION (Tables)	Sep. 30, 2024
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	The following tables show a disaggregation of our Net sales by segment and geographic region (in millions). Corporate eliminations (shown below) largely reflect intercompany sales from Composites to Roofing. External customer sales are attributed to geographic region based upon the location from which the product is sold to the external customer. For the three months ended September 30, 2024 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 1,019 $ 416 $ 445 $ 122 $ (82) $ 1,920 U.S. commercial and industrial 43 195 — 181 (2) 417 Total United States 1,062 611 445 303 (84) 2,337 Europe — 183 57 107 (1) 346 Asia-Pacific — 34 — 94 — 128 Rest of world 16 118 71 30 — 235 NET SALES $ 1,078 $ 946 $ 573 $ 534 $ (85) $ 3,046 For the three months ended September 30, 2023 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 1,009 $ 351 $ — $ 98 $ (82) $ 1,376 U.S. commercial and industrial 49 218 — 201 (2) 466 Total United States 1,058 569 — 299 (84) 1,842 Europe 5 191 — 115 (1) 310 Asia-Pacific — 37 — 111 — 148 Rest of world 21 116 — 42 — 179 NET SALES $ 1,084 $ 913 $ — $ 567 $ (85) $ 2,479 For the nine months ended September 30, 2024 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 2,991 $ 1,177 $ 689 $ 360 $ (249) $ 4,968 U.S. commercial and industrial 100 606 — 536 (7) 1,235 Total United States 3,091 1,783 689 896 (256) 6,203 Europe — 543 87 347 (2) 975 Asia-Pacific — 98 1 265 — 364 Rest of world 49 342 107 95 — 593 NET SALES $ 3,140 $ 2,766 $ 884 $ 1,603 $ (258) $ 8,135 For the nine months ended September 30, 2023 Reportable Segments Roofing Insulation Doors Composites Eliminations Consolidated Disaggregation Categories U.S. residential $ 2,902 $ 1,045 $ — $ 270 $ (230) $ 3,987 U.S. commercial and industrial 113 647 — 656 (6) 1,410 Total United States 3,015 1,692 — 926 (236) 5,397 Europe 13 586 — 387 (2) 984 Asia-Pacific 1 109 — 334 — 444 Rest of world 73 350 — 125 — 548 NET SALES $ 3,102 $ 2,737 $ — $ 1,772 $ (238) $ 7,373
Schedule of Earnings before Interest and Taxes	The following table summarizes EBIT by segment (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Reportable Segments Roofing $ 359 $ 343 $ 1,018 $ 890 Insulation 183 150 527 469 Doors 36 — 70 — Composites 61 80 168 216 Total reportable segments 639 573 1,783 1,575 Restructuring costs (1) (41) (62) (106) Gain on sale of Santa Clara, California site — — — 189 Gains on sale of certain precious metals 19 — 19 2 Paroc marine recall (1) (14) (8) (14) Strategic review-related charges (16) — (33) — Acquisition-related transaction costs (2) — (49) — Acquisition-related integration costs (53) — (74) — Impairment of venture investment (13) — (13) — Recognition of acquisition inventory fair value step-up (6) — (18) — General corporate expense and other (57) (55) (175) (162) Total corporate, other and eliminations (130) (110) (413) (91) EBIT $ 509 $ 463 $ 1,370 $ 1,484

INVENTORIES (Tables)

INVENTORIES (Tables)	9 Months Ended
INVENTORIES (Tables)	Sep. 30, 2024
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	Inventories consist of the following (in millions): September 30, 2024 December 31, 2023 Finished goods $ 842 $ 742 Materials and supplies 754 456 Total inventories $ 1,596 $ 1,198

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Assets and Liabilities at Fair Value	The following table presents the fair value of derivatives and hedging instruments and their respective location on the Consolidated Balance Sheets (in millions): Fair Value at Location September 30, 2024 December 31, 2023 Derivative assets designated as hedging instruments: Cash flow hedges: Natural gas forward swaps Other current assets $ 1 $ — Derivative liabilities designated as hedging instruments: Cash flow hedges: Natural gas forward swaps Other current liabilities $ 2 $ 15 Derivative assets not designated as hedging instruments: Foreign exchange forward contracts Other current assets $ 1 $ 1 Derivative liabilities not designated as hedging instruments: Foreign exchange forward contracts Other current liabilities $ 1 $ 1
Schedule of Fair Value Derivative Instruments Statements of Earnings Location	The following table presents the impact and respective location of derivative activities on the Consolidated Statements of Earnings (in millions): Three Months Ended Nine Months Ended Location 2024 2023 2024 2023 Derivative activity designated as hedging instruments: Natural gas cash flow hedges: Amount of loss reclassified from AOCI (as defined below) into earnings (a) Cost of sales $ 2 $ 10 $ 16 $ 42 Treasury interest rate lock: Amount of gain reclassified from AOCI (as defined below) into earnings (a) Interest expense, net $ 1 $ — $ 1 $ — Derivative activity not designated as hedging instruments: Foreign currency: Amount of (gain) loss recognized in earnings (b) Other expense, net $ — $ — $ (4) $ 4 (a) Accumulated Other Comprehensive Earnings (Deficit) (“AOCI”) (b) (Gains)/losses related to foreign currency derivatives were substantially offset by net revaluation impacts on foreign currency denominated balance sheet exposures, which were also recorded in Other expense, net. Please refer to the “Other Derivatives” section below for additional detail. Consolidated Statements of Comprehensive Earnings Activity The following table presents the impact of derivative activities on the Consolidated Statements of Comprehensive Earnings (in millions): Amount of Gain Recognized in Comprehensive Earnings Three Months Ended Nine Months Ended Hedging Type Derivative Financial Instrument 2024 2023 2024 2023 Cash flow hedge Natural gas forward swaps $ 1 $ 6 $ 14 $ 14

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	9 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the net carrying value of goodwill by segment are as follows (in millions): Roofing Insulation Doors Composites Total Gross carrying amount at December 31, 2023 $ 395 $ 1,520 $ — $ 425 $ 2,340 Acquisitions (see Note 7) — — 1,473 — 1,473 Foreign currency translation 1 3 — — 4 Gross carrying amount at September 30, 2024 396 1,523 1,473 425 3,817 Accumulated impairment losses at December 31, 2023 — (948) — — (948) Foreign currency translation — (2) — — (2) Accumulated impairment losses at September 30, 2024 — (950) — — (950) Balance, net of impairment, at September 30, 2024 $ 396 $ 573 $ 1,473 $ 425 $ 2,867
Schedule of Finite-Lived Intangible Assets	Other intangible assets consist of the following (in millions): September 30, 2024 December 31, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Accumulated Net Indefinite-lived trademarks and trade names $ 1,232 $ — $ 1,232 $ 992 $ — $ 992 Amortizable intangible assets Customer relationships 1,595 (349) 1,246 614 (283) 331 Technology 432 (233) 199 326 (203) 123 Trademarks and trade names 31 (3) 28 12 (2) 10 Other (a) 67 (1) 66 74 (2) 72 Total other intangible assets $ 3,357 $ (586) $ 2,771 $ 2,018 $ (490) $ 1,528
Schedule of Impaired Intangible Assets	The following table presents the carrying values of these assets as of September 30, 2024: Trademarks and trade names September 30, 2024 European building and technical insulation trade name $ 91 Global cellular glass insulation trademark $ 80
Finite-lived Intangible Assets Amortization Expense	The estimated amortization expense for intangible assets for the next five fiscal years ended December 31 is as follows (in millions): Period Amortization 2025 $ 150 2026 $ 136 2027 $ 127 2028 $ 126 2029 $ 112

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	9 Months Ended
PROPERTY, PLANT AND EQUIPMENT (Tables)	Sep. 30, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment consist of the following (in millions): September 30, December 31, 2023 Land $ 225 $ 168 Buildings and leasehold improvements 1,549 1,263 Machinery and equipment 6,203 5,402 Construction in progress 504 665 Property, plant and equipment, gross 8,481 7,498 Accumulated depreciation (3,888) (3,657) Property, plant and equipment, net $ 4,593 $ 3,841

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	9 Months Ended
ACQUISITIONS (Tables)	Sep. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Fair Value of Total Purchase Consideration Transferred	The fair value of the total purchase consideration transferred was determined as follows (in millions): Fair Value of Purchase Consideration Closing cash consideration $ 2,935 Pre-combination vesting portion of fair value of Masonite outstanding equity awards converted to Owens Corning time vesting RSUs 35 Repayment of Masonite term loan facility 216 Total transaction consideration $ 3,186
Preliminary Estimated Fair Value Of Common Stock	The preliminary estimated fair value of Owens Corning common stock underlying Masonite outstanding equity awards that have been converted into awards with respect to Owens Corning common stock is calculated as follows (in millions, except share and per share amounts: Amount Number of Masonite stock awards outstanding (a) 639,608 Exchange ratio (b) 0.7642 Owens Corning equity awards issued for Masonite outstanding equity awards 488,778 10-day weighted average closing share price of Owens Corning common stock (c) $ 174.03 Fair value of Owens Corning time vesting RSUs issued for Masonite outstanding equity awards $ 85 Less: Estimated fair value allocated to post-transaction compensation expense (50) Fair value of awards included in transaction consideration $ 35 (a) Represents the Masonite stock awards that have been converted into Owens Corning equity awards upon completion of the acquisition of Masonite, based on awards outstanding at May 15, 2024. Masonite equity awards include awards issued under various stock incentive plans of Masonite. (b) The exchange rate was determined by the consideration amount divided by the volume weighted average closing sale price of one share of Owens Corning common stock for the ten consecutive trading days ended May 15, 2024, in accordance with the terms of the Arrangement Agreement. (c) The ten-day weighted average closing share price was calculated for the ten consecutive trading days ended May 15, 2024, in accordance with the terms of the Arrangement Agreement.
Preliminary Acquisition Date Fair Value of Net Intangible Assets Acquired, Net Of Liabilities Assumed	The following table summarizes the preliminary acquisition date fair value net of measurement period adjustments of net tangible and intangible assets acquired, net of liabilities assumed as part of the Arrangement (in millions): As originally reported Measurement period adjustments As adjusted Cash and cash equivalents $ 282 $ — $ 282 Receivables, net 330 — 330 Inventories 379 — 379 Other current assets 82 — 82 Property, plant and equipment, net 861 — 861 Operating lease right-of-use assets 253 — 253 Intangible assets 1,579 (221) 1,358 Deferred income taxes 14 — 14 Other non-current assets 91 — 91 Total assets 3,871 (221) 3,650 Accounts payable 196 — 196 Current operating lease liabilities 28 — 28 Other current liabilities 187 (3) 184 Long-term debt 867 — 867 Non-current operating lease liabilities 235 — 235 Deferred income taxes 413 (56) 357 Other non-current liabilities 32 3 35 Net assets acquired 1,913 (165) 1,748 Non-controlling interest (35) — (35) Goodwill 1,308 165 1,473 Total net assets acquired $ 3,186 $ — $ 3,186 Estimated Useful Life (in years) Preliminary Estimated Asset Fair Value Customer relationships 10 - 21 $ 979 Technology 5 120 Trademarks and trade names (indefinite-lived) Indefinite 240 Trademarks and trade names 10 19 Identifiable intangible assets, net $ 1,358
Pro Forma Financial Information	The following table summarizes, on an unaudited pro forma basis, the combined results of operations of the Company for the three months ended and the nine months ended September 30, 2024 and 2023, assuming the acquisition had occurred on January 1, 2023 (in millions). Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Net sales $ 3,046 $ 3,099 $ 9,035 $ 9,275 Net earnings $ 327 $ 339 $ 1,004 $ 993

WARRANTIES (Tables)

WARRANTIES (Tables)	9 Months Ended
WARRANTIES (Tables)	Sep. 30, 2024
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability	A reconciliation of the warranty liability is as follows (in millions): Nine Months Ended September 30, 2024 2023 Beginning balance $ 97 $ 88 Amounts accrued for current year 15 18 Acquired obligations 4 — Settlements of warranty claims (17) (10) Ending balance $ 99 $ 96

RESTRUCTURING, ACQUISITION AN_2

RESTRUCTURING, ACQUISITION AND DIVESTITURE-RELATED COSTS (Tables)	9 Months Ended
	Sep. 30, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Costs on the Consolidated Statements of Earnings	The following table presents the impact and respective location of total restructuring, acquisition and divestiture-related costs on the Consolidated Statements of Earnings, which are included within Corporate, Other and Eliminations (in millions): Three Months Ended September 30, Nine Months Ended September 30, Type of cost Location 2024 2023 2024 2023 Accelerated depreciation Cost of sales $ (1) $ (23) $ (8) $ (46) Other exit costs Cost of sales (1) (7) (6) (15) Other exit costs Marketing and administrative expenses — — (1) (1) Severance Other expense, net 1 — (47) (25) Other exit costs Other expense, net — — — (1) Accelerated amortization Other expense, net — (11) — (18) Acquisition-related transaction costs Other expense, net (2) — (49) — Acquisition-related integration costs Other expense, net (53) — (74) — Gain on sale of Santa Clara, California site Gain on sale of site — — — 189 Total restructuring, acquisition and divestiture-related (costs) gains $ (56) $ (41) $ (185) $ 83
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the status of the unpaid liabilities from the Company’s restructuring activities (in millions): September 30, 2024 Acquisition-related Restructuring Global Composites Restructuring Protective Packaging Exit Wabash Facility Closure European Operating Structure Optimization Balance at December 31, 2023 $ — $ 12 $ 1 $ 3 $ 6 Restructuring costs 45 10 4 — 3 Payments (21) (4) (3) (3) (4) Accelerated depreciation and other non-cash items (23) (8) (2) — — Balance at September 30, 2024 $ 1 $ 10 $ — $ — $ 5 Cumulative charges incurred $ 45 $ 26 $ 82 $ 33 $ 15 As of September 30, 2024, the remaining liability balance was comprised of $16 million, inclusive of $2 million of non-current severance and $14 million of severance the Company expects to pay over the next twelve months. September 30, 2023 Protective Packaging Exit Wabash Facility Closure European Operating Structure Optimization Composites Strategic Realignment Actions Roofing Restructuring Actions Santa Clara Insulation Site Balance at December 31, 2022 $ — $ — $ — $ 1 $ — $ 7 Restructuring costs 61 23 12 3 2 5 Payments — — (4) (3) (2) (11) Accelerated depreciation and other non-cash items (49) (20) — — — (1) Balance at September 30, 2023 $ 12 $ 3 $ 8 $ 1 $ — $ — Cumulative charges incurred $ 61 $ 23 $ 12 $ 12 $ 10 $ 65

DEBT (Tables)

DEBT (Tables)	9 Months Ended
DEBT (Tables)	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Details of the Company’s outstanding long-term debt, as well as the fair values, are as follows (in millions): September 30, 2024 December 31, 2023 Carrying Value Fair Value Carrying Value Fair Value 4.200% senior notes, net of discount and financing fees, due 2024 $ 400 100 % $ 399 99 % 3.400% senior notes, net of discount and financing fees, due 2026 399 99 % 398 96 % 5.500% senior notes, net of discount and financing fees, due 2027 497 103 % N/A N/A 5.375% senior notes, net of discount and financing fees, due 2028 29 100 % N/A N/A 3.950% senior notes, net of discount and financing fees, due 2029 447 98 % 447 95 % 3.500% senior notes, net of discount and financing fees, due 2030 2 89 % N/A N/A 3.500% senior notes, net of discount and financing fees, due 2030 336 95 % N/A N/A 3.875% senior notes, net of discount and financing fees, due 2030 298 97 % 298 94 % 5.700% senior notes, net of discount and financing fees, due 2034 789 106 % N/A N/A 7.000% senior notes, net of discount and financing fees, due 2036 369 117 % 369 116 % 4.300% senior notes, net of discount and financing fees, due 2047 589 85 % 589 88 % 4.400% senior notes, net of discount and financing fees, due 2048 391 85 % 391 87 % 5.950% senior notes, net of discount and financing fees, due 2054 683 106 % N/A N/A Various finance leases, due through 2050 (a) 236 100 % 154 100 % Other — N/A 1 N/A Total long-term debt 5,465 N/A 3,046 N/A Less – current portion of senior notes 400 100 % 399 99 % Less – current portion of finance leases and other (a) 37 100 % 32 100 % Long-term debt, net of current portion $ 5,028 N/A $ 2,615 N/A (a)
Schedule of Line of Credit Facilities	The following table shows how the Company utilized its primary sources of liquidity (in millions): Balance at September 30, 2024 Senior Revolving Credit Facility Receivables Securitization Facility Facility size or borrowing limit $ 1,000 $ 300 Collateral capacity limitation on availability N/A — Outstanding borrowings — — Outstanding letters of credit 4 1 Availability on facility $ 996 $ 299

PENSION PLANS AND OTHER POSTR_2

PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)	9 Months Ended
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)	Sep. 30, 2024
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs	The following table presents the components of net periodic pension cost (in millions): Three Months Ended September 30, 2024 2023 U.S. Non-U.S. Total U.S. Non-U.S. Total Components of Net Periodic Pension Cost Service cost $ 1 $ — $ 1 $ 1 $ — $ 1 Interest cost 4 3 7 8 4 12 Expected return on plan assets (5) (3) (8) (10) (4) (14) Amortization of actuarial loss 1 1 2 1 1 2 Net periodic pension cost $ 1 $ 1 $ 2 $ — $ 1 $ 1 Nine Months Ended September 30, 2024 2023 U.S. Non-U.S. Total U.S. Non-U.S. Total Components of Net Periodic Pension Cost Service cost $ 2 $ 2 $ 4 $ 2 $ 2 $ 4 Interest cost 13 10 23 24 12 36 Expected return on plan assets (17) (10) (27) (30) (11) (41) Amortization of actuarial loss 2 3 5 4 2 6 Net periodic pension cost $ — $ 5 $ 5 $ — $ 5 $ 5
Other Postretirement Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Net Benefit Costs	The following table provides the components of net periodic postretirement benefit income for U.S. plans for the periods indicated (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Components of Net Periodic Postretirement Benefit Income Service cost $ — $ — $ — $ — Interest cost 1 1 4 4 Amortization of actuarial gain (2) (2) (6) (6) Net periodic postretirement benefit income $ (1) $ (1) $ (2) $ (2)

STOCK COMPENSATION (Tables)

STOCK COMPENSATION (Tables)	9 Months Ended
STOCK COMPENSATION (Tables)	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	Stock-based compensation expense included in Marketing and administrative expenses in the accompanying Consolidated Statements of Earnings is as follows (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Total stock-based compensation expense $ 21 $ 11 $ 74 $ 38
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table summarizes the Company’s RSU activity: Number of RSUs Weighted-Average Balance at December 31, 2023 1,225,668 $ 79.72 Granted 227,843 154.60 Assumed (converted Masonite equity awards) 488,778 174.03 Vested (609,245) 120.58 Forfeited (36,528) 119.20 Balance at September 30, 2024 1,296,516 $ 108.12
Share-Based Payment Arrangement, Performance Shares, Activity	The following table provides a summary of the grant date fair values of the internal Company-based metric PSUs: Nine Months Ended September 30, 2024 2023 Grant date fair value of units granted $ 147.18 $ 92.97
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The following table provides a summary of the assumptions for PSUs granted in 2024 and 2023: Nine Months Ended September 30, 2024 2023 Expected volatility 33.88% 44.66% Risk free interest rate 3.94% 3.75% Expected term (in years) 2.91 2.91 Grant date fair value of units granted $ 195.95 $ 119.33
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest	The following table summarizes the Company’s PSU activity: Number of PSUs Weighted-Average Balance at December 31, 2023 268,677 $ 100.57 Granted 95,997 161.12 Vested (9,063) 109.17 Forfeited (16,152) 105.34 Balance at September 30, 2024 339,459 $ 117.24

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
EARNINGS PER SHARE (Tables)	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table is a reconciliation of weighted-average shares for calculating basic and diluted earnings per share (in millions, except per share amounts): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Net earnings attributable to Owens Corning $ 321 $ 337 $ 905 $ 1,065 Weighted-average number of shares outstanding used for basic earnings per share 87.0 90.0 87.2 90.6 Non-vested restricted stock units and performance share units 0.9 0.9 0.8 0.9 Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share 87.9 90.9 88.0 91.5 Earnings per common share attributable to Owens Corning common stockholders: Basic $ 3.69 $ 3.74 $ 10.38 $ 11.75 Diluted $ 3.65 $ 3.71 $ 10.28 $ 11.64

INCOME TAXES (Tables)

INCOME TAXES (Tables)	9 Months Ended
INCOME TAXES (Tables)	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The following table provides the Income tax expense (in millions) and effective tax rate for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Income tax expense $ 120 $ 110 $ 318 $ 361 Effective tax rate 27 % 25 % 26 % 25 %

CHANGES IN ACCUMULATED OTHER _2

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE DEFICIT (Tables)	9 Months Ended
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE DEFICIT (Tables)	Sep. 30, 2024
Equity [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes in accumulated other comprehensive income (deficit) (in millions): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Currency Translation Adjustment Beginning balance $ (421) $ (339) $ (318) $ (380) Gain (loss) on foreign currency translation 69 (73) (34) (32) Other comprehensive income (loss), net of tax 69 (73) (34) (32) Ending balance $ (352) $ (412) $ (352) $ (412) Pension and Other Postretirement Adjustment Beginning balance $ (197) $ (304) $ (196) $ (301) Amounts reclassified from AOCI to net earnings, net of tax (a) — — (1) — Amounts classified into AOCI, net of tax (4) 2 (4) (1) Other comprehensive (loss) income, net of tax (4) 2 (5) (1) Ending balance $ (201) $ (302) $ (201) $ (302) Hedging Adjustment Beginning balance $ 21 $ 6 $ 11 $ — Amounts reclassified from AOCI to net earnings, net of tax (b) 2 8 12 32 Amounts classified into AOCI, net of tax (1) (3) (1) (21) Other comprehensive income, net of tax 1 5 11 11 Ending balance $ 22 $ 11 $ 22 $ 11 Total AOCI ending balance $ (531) $ (703) $ (531) $ (703) (a) These AOCI components are included in the computation of total Pension and Other postretirement expense and are recorded in Non-operating income. See Note 12 for additional information. (b) Amounts reclassified from (loss) gain on cash flow hedges are reclassified from AOCI to income when the hedged item affects earnings and is recognized in Cost of sales or Interest expense, net depending on the hedged item. See Note 4 for additional information.

GENERAL (Details)

GENERAL (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 09, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	May 15, 2024	Feb. 08, 2024	Dec. 31, 2022
Related Party Transaction [Line Items]
Contract liability		$ 115	$ 96	$ 115	$ 96	$ 101			$ 89
Contract liability, revenue recognized				19	17
Restricted cash		20	9	20	9	8			$ 8
Related party transaction, expenses		20	22	85	72
Outstanding supplier finance programs		180		180		$ 211
Invoices paid				405	454
Revenue		3,046	2,479	8,135	7,373
Strategic review related charges		16	$ 0	$ 33	$ 0
Masonite
Related Party Transaction [Line Items]
Purchase price (in dollars per share)							$ 133	$ 133
First Customer \| Accounts Receivable \| Customer Concentration Risk
Related Party Transaction [Line Items]
Concentration risk percentage				23%		11%
Second Customer \| Accounts Receivable \| Customer Concentration Risk
Related Party Transaction [Line Items]
Concentration risk percentage				15%		11%
Composites \| Global Glass Reinforcements ("GR") Business
Related Party Transaction [Line Items]
Revenue	$ 1,300
Related Party
Related Party Transaction [Line Items]
Due to related party supplier		$ 3		$ 3		$ 5

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended		5 Months Ended	9 Months Ended
SEGMENT INFORMATION (Details) $ in Millions	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Segment Reporting, Significant Reconciling Item [Line Items]
Number of reportable segments \| segment				4
Disaggregated revenue	$ 3,046	$ 2,479		$ 8,135	$ 7,373
EARNINGS BEFORE INTEREST AND TAXES	509	463		1,370	1,484
Restructuring costs	(1)	(41)		(62)	(106)
Gain on sale of Santa Clara, California site	0	0		0	189
Gains on sale of certain precious metals	19	0		19	2
Paroc marine recall	(1)	(14)		(8)	(14)
Strategic review-related charges	(16)	0		(33)	0
Recognition of acquisition inventory fair value step-up	(6)	0		(18)	0
General corporate expense and other	(57)	(55)		(175)	(162)
Impairment of venture investment	(13)	0		(13)	0
Acquisition-related transaction costs
Segment Reporting, Significant Reconciling Item [Line Items]
Acquisition-related transaction costs	(2)	0		(49)	0
Acquisition-related integration costs
Segment Reporting, Significant Reconciling Item [Line Items]
Acquisition-related transaction costs	(53)	0		(74)	0
Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	(85)	(85)		(258)	(238)
EARNINGS BEFORE INTEREST AND TAXES	(130)	(110)		(413)	(91)
U.S.
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	2,337	1,842		6,203	5,397
U.S. \| Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	(84)	(84)		(256)	(236)
U.S. \| Residential
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	1,920	1,376		4,968	3,987
U.S. \| Residential \| Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	(82)	(82)		(249)	(230)
U.S. \| Commercial and Industrial Sector
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	417	466		1,235	1,410
U.S. \| Commercial and Industrial Sector \| Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	(2)	(2)		(7)	(6)
Europe
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	346	310		975	984
Europe \| Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	(1)	(1)		(2)	(2)
Asia Pacific
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	128	148		364	444
Asia Pacific \| Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	0	0		0	0
Rest of world
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	235	179		593	548
Rest of world \| Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	0	0		0	0
Total Segments \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
EARNINGS BEFORE INTEREST AND TAXES	639	573		$ 1,783	$ 1,575
Roofing, Insulation And Doors \| Second Customer \| Revenue Benchmark \| Customer Concentration Risk
Segment Reporting, Significant Reconciling Item [Line Items]
Concentration risk percentage				12%
Roofing And Insulation \| First Customer \| Revenue Benchmark \| Customer Concentration Risk
Segment Reporting, Significant Reconciling Item [Line Items]
Concentration risk percentage				12%	12%
Roofing \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	1,078	1,084		$ 3,140	$ 3,102
EARNINGS BEFORE INTEREST AND TAXES	359	343		1,018	890
Roofing \| U.S. \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	1,062	1,058		3,091	3,015
Roofing \| U.S. \| Residential \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	1,019	1,009		2,991	2,902
Roofing \| U.S. \| Commercial and Industrial Sector \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	43	49		100	113
Roofing \| Europe \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	0	5		0	13
Roofing \| Asia Pacific \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	0	0		0	1
Roofing \| Rest of world \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	16	21		49	73
Insulation \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	946	913		2,766	2,737
EARNINGS BEFORE INTEREST AND TAXES	183	150		527	469
Insulation \| U.S. \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	611	569		1,783	1,692
Insulation \| U.S. \| Residential \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	416	351		1,177	1,045
Insulation \| U.S. \| Commercial and Industrial Sector \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	195	218		606	647
Insulation \| Europe \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	183	191		543	586
Insulation \| Asia Pacific \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	34	37		98	109
Insulation \| Rest of world \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	118	116		342	350
Doors \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	573	0	$ 884		0
EARNINGS BEFORE INTEREST AND TAXES	36	0		70	0
Doors \| U.S. \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	445	0		689	0
Doors \| U.S. \| Residential \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	445	0		689	0
Doors \| U.S. \| Commercial and Industrial Sector \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	0	0		0	0
Doors \| Europe \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	57	0		87	0
Doors \| Asia Pacific \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	0	0		1	0
Doors \| Rest of world \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	71	0		107	0
Composites \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	534	567		1,603	1,772
EARNINGS BEFORE INTEREST AND TAXES	61	80		168	216
Composites \| U.S. \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	303	299		896	926
Composites \| U.S. \| Residential \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	122	98		360	270
Composites \| U.S. \| Commercial and Industrial Sector \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	181	201		536	656
Composites \| Europe \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	107	115		347	387
Composites \| Asia Pacific \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	94	111		265	334
Composites \| Rest of world \| Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	$ 30	$ 42		$ 95	$ 125

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Finished goods	$ 842	$ 742
Materials and supplies	754	456
Total inventories	$ 1,596	$ 1,198

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS - Balance Sheet (Details) - USD ($) $ in Millions	1 Months Ended
	May 31, 2024	Dec. 31, 2022	Sep. 30, 2024	Dec. 31, 2023
Treasury interest rate lock
Derivatives, Fair Value [Line Items]
Amortized portion part of interest expense for future issuance of debt	$ 31	$ 31
Designated as Hedging Instrument \| Cash Flow Hedging \| Energy Related Derivative
Derivatives, Fair Value [Line Items]
Derivative asset, fair value			$ 1	$ 0
Derivative liability, fair value			2	15
Nondesignated as Hedging Instrument \| Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Derivative asset, fair value			1	1
Derivative liability, fair value			$ 1	$ 1

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Energy Related Derivative \| Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) reclassified from AOCI (as defined below) into earnings			$ (1)
Amount of gain recognized in earnings	$ 1	$ 6	14	$ 14
Designated as Hedging Instrument \| Energy Related Derivative
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) reclassified from AOCI (as defined below) into earnings	(2)	(10)	(16)	(42)
Nondesignated as Hedging Instrument \| Foreign Exchange Contract
Derivative Instruments Gain Loss [Line Items]
Amount of gain recognized in earnings	0	0	(4)	4
Nondesignated as Hedging Instrument \| Treasury interest rate lock
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) reclassified from AOCI (as defined below) into earnings	$ 1	$ 0	$ 1	$ 0

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow (Details) MMBTU in Millions, $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended
	May 31, 2024 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2024 USD ($) MMBTU	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) MMBTU	Sep. 30, 2023 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Recognized gain						$ 1
Unrecognized gain included in AOCI						$ 30
5.700% senior notes, net of discount and financing fees, due 2034
Derivative [Line Items]
Long-term debt, percentage rate	5.70%			5.70%		5.70%
Debt instrument, face amount	$ 800
Energy Related Derivative \| Cash Flow Hedging
Derivative [Line Items]
Derivative, nonmonetary notional amount \| MMBTU				7		7
Unrecognized loss						$ 1
Loss reclassified from AOCI						1
Amount of gain recognized in earnings				$ (1)	$ (6)	$ (14)	$ (14)
Treasury interest rate lock
Derivative [Line Items]
Derivative, notional amount								$ 175
Term of derivatives (in years)						10 years
Derivative, fixed interest rate								0.994%
Amount of gain recognized in earnings			$ 6
Cash received upon settlement		$ 37
Amortized portion part of interest expense for future issuance of debt	$ 31	$ 31
Euro Member Countries, Euro \| Foreign exchange forward contracts
Derivative [Line Items]
Derivative, notional amount				78		$ 78
U.S. \| Foreign exchange forward contracts
Derivative [Line Items]
Derivative, notional amount				$ 131		$ 131

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024 USD ($) intangible_asset	Dec. 31, 2023	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) intangible_asset	Sep. 30, 2023 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of indefinite-lived intangible assets are increased risk of impairment \| intangible_asset	2			2
Amortization expense for intangible assets	$ 42		$ 28	$ 97	$ 70
Amortization expense for intangible assets for remainder of the year	$ 31			$ 31
Composites
Finite-Lived Intangible Assets [Line Items]
Percentage of enterprise value exceeding carrying value in annual impairment test		5%		10%
Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	25 years			25 years

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Rollforward (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Balance at beginning of period, gross carrying amount	$ 2,340
Acquisitions (see Note 7)	1,473
Foreign currency translation	4
Balance at end of period, gross carrying amount	3,817
Goodwill, Impaired, Accumulated Impairment [Roll Forward]
Balance at beginning of period, accumulated impairment loss	(948)
Foreign currency translation	(2)
Balance at end of period, accumulated impairment loss	(950)
Goodwill, net	2,867	$ 1,392
Composites
Goodwill [Roll Forward]
Balance at beginning of period, gross carrying amount	425
Acquisitions (see Note 7)	0
Foreign currency translation	0
Balance at end of period, gross carrying amount	425
Goodwill, Impaired, Accumulated Impairment [Roll Forward]
Balance at beginning of period, accumulated impairment loss	0
Foreign currency translation	0
Balance at end of period, accumulated impairment loss	0
Goodwill, net	425
Insulation
Goodwill [Roll Forward]
Balance at beginning of period, gross carrying amount	1,520
Acquisitions (see Note 7)	0
Foreign currency translation	3
Balance at end of period, gross carrying amount	1,523
Goodwill, Impaired, Accumulated Impairment [Roll Forward]
Balance at beginning of period, accumulated impairment loss	(948)
Foreign currency translation	(2)
Balance at end of period, accumulated impairment loss	(950)
Goodwill, net	573
Doors
Goodwill [Roll Forward]
Balance at beginning of period, gross carrying amount	0
Acquisitions (see Note 7)	1,473
Foreign currency translation	0
Balance at end of period, gross carrying amount	1,473
Goodwill, Impaired, Accumulated Impairment [Roll Forward]
Balance at beginning of period, accumulated impairment loss	0
Foreign currency translation	0
Balance at end of period, accumulated impairment loss	0
Goodwill, net	1,473
Roofing
Goodwill [Roll Forward]
Balance at beginning of period, gross carrying amount	395
Acquisitions (see Note 7)	0
Foreign currency translation	1
Balance at end of period, gross carrying amount	396
Goodwill, Impaired, Accumulated Impairment [Roll Forward]
Balance at beginning of period, accumulated impairment loss	0
Foreign currency translation	0
Balance at end of period, accumulated impairment loss	0
Goodwill, net	$ 396

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets Rollforward (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (586)	$ (490)
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amount	3,357	2,018
Accumulated Amortization	(586)	(490)
Net Carrying Amount	2,771	1,528
Trademarks and trade names
Acquired Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived trademarks and trade names	1,232	992
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,595	614
Accumulated Amortization	(349)	(283)
Net Carrying Amount	1,246	331
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(349)	(283)
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	432	326
Accumulated Amortization	(233)	(203)
Net Carrying Amount	199	123
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(233)	(203)
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	31	12
Accumulated Amortization	(3)	(2)
Net Carrying Amount	28	10
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(3)	(2)
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67	74
Accumulated Amortization	(1)	(2)
Net Carrying Amount	66	72
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	$ (1)	$ (2)

GOODWILL AND OTHER INTANGIBLE_6

GOODWILL AND OTHER INTANGIBLE ASSETS - Impaired Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Intangible Assets By Major Class [Line Items]
Intangible assets, net	$ 2,771	$ 1,528
European building and technical insulation trade name
Schedule Of Intangible Assets By Major Class [Line Items]
Intangible assets, net	91
Global cellular glass insulation trademark
Schedule Of Intangible Assets By Major Class [Line Items]
Intangible assets, net	$ 80

GOODWILL AND OTHER INTANGIBLE_7

GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense (Details) $ in Millions	Sep. 30, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2025	$ 150
2026	136
2027	127
2028	126
2029	$ 112

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Property plant and equipment, gross	$ 8,481	$ 8,481		$ 7,498
Accumulated depreciation	(3,888)	(3,888)		(3,657)
Property, plant and equipment, net	$ 4,593	$ 4,593		$ 3,841
Precious metals depletion percentage	7%	7%		10%
Precious metal percent of deprecation expense	2%	2%
Gains On Sale Of Certain Precious Metals	$ 19	$ 19	$ 2
Land
Property Plant And Equipment [Line Items]
Property plant and equipment, gross	225	225		$ 168
Buildings and leasehold improvements
Property Plant And Equipment [Line Items]
Property plant and equipment, gross	1,549	1,549		1,263
Machinery and equipment
Property Plant And Equipment [Line Items]
Property plant and equipment, gross	6,203	6,203		5,402
Construction in progress
Property Plant And Equipment [Line Items]
Property plant and equipment, gross	$ 504	$ 504		$ 665

ACQUISITIONS - Narrative (Detai

ACQUISITIONS - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended		5 Months Ended	9 Months Ended
	May 15, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	May 13, 2024	Apr. 15, 2024	Feb. 08, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Common stock, outstanding (in shares)		85,800		85,800	85,800					87,200
Goodwill		$ 2,867		$ 2,867	$ 2,867					$ 1,392
Net sales		(3,046)	$ (2,479)		(8,135)	$ (7,373)
Increase (decrease) in net earnings		$ 321	337		$ 905	1,063
5.375% senior notes, net of discount and financing fees, due 2028
Business Acquisition [Line Items]
Long-term debt, percentage rate		5.375%		5.375%	5.375%
Adjustment, Increased Amortization Expense For Fair Value Of Identified Amortizable Intangible Assets
Business Acquisition [Line Items]
Increase (decrease) in net earnings			(19)		$ (14)	(68)
Adjustment, Interest Expense, Discount Amortization And Capitalized Financing Cost Amortization
Business Acquisition [Line Items]
Increase (decrease) in net earnings			(29)		(49)	(78)
Masonite
Business Acquisition [Line Items]
Purchase price (in dollars per share)	$ 133								$ 133
Percentage of voting rights to be acquired	100%
Business combination, consideration transferred	$ 3,186
Debt proceeds	$ 2,800
Net earnings				$ 54
Acquisition related costs		$ 2			49
Price per share (in dollars per share)	$ 133
Goodwill	$ 1,473
Receivables, net	330
Gross accounts receivable	331
Uncollectible accounts receivable	1
Fair value of inventory stepped up	18
Property, plant and equipment, net	861
Intangible assets	1,358
Masonite \| Measurement period adjustments
Business Acquisition [Line Items]
Goodwill	165	165		165	165
Receivables, net	0
Property, plant and equipment, net	0
Intangible assets	$ (221)	(221)		$ (221)	(221)
Masonite \| Dominance Industries, Inc.
Business Acquisition [Line Items]
Percentage of voting rights to be acquired	45%
Masonite \| Vanair Design Inc.
Business Acquisition [Line Items]
Percentage of voting rights to be acquired	30%
Masonite \| Sacopan Inc.
Business Acquisition [Line Items]
Percentage of voting rights to be acquired	25%
Masonite \| Magna Foremost SDN BHD
Business Acquisition [Line Items]
Percentage of voting rights to be acquired	50%
Masonite \| Masonite
Business Acquisition [Line Items]
Common stock, outstanding (in shares)	22,070
Masonite \| 5.375% senior notes, net of discount and financing fees, due 2028
Business Acquisition [Line Items]
Percentage of long-term debt tendered							94.25%
Long-term debt, percentage rate								5.375%
Masonite \| Adjustment, Removal Of Sales Of Architectural Segment
Business Acquisition [Line Items]
Net sales			83		119	268
Masonite \| Adjustment, Transaction Costs Incurred By Acquiree
Business Acquisition [Line Items]
Increase (decrease) in net earnings					56
Masonite \| Adjustment, Transaction Costs Incurred By Acquirer
Business Acquisition [Line Items]
Increase (decrease) in net earnings		2			49	49
Masonite \| Adjustment, Tax Impacts Of Proforma Adjustments
Business Acquisition [Line Items]
Increase (decrease) in net earnings		$ (2)	$ 14		$ (88)	$ 60

ACQUISITIONS - Fair Value of To

ACQUISITIONS - Fair Value of Total Purchase Consideration Transferred (Details) - Masonite $ in Millions	May 15, 2024 USD ($)
Business Acquisition [Line Items]
Closing cash consideration	$ 2,935
Pre-combination vesting portion of fair value of Masonite outstanding equity awards converted to Owens Corning time vesting RSUs	35
Repayment of Masonite term loan facility	216
Total transaction consideration	$ 3,186

ACQUISITIONS - Preliminary Esti

ACQUISITIONS - Preliminary Estimated Fair Value Of Common Stock (Details) - Masonite $ / shares in Units, $ in Millions	May 15, 2024 USD ($) $ / shares shares
Business Acquisition [Line Items]
Number of Masonite stock awards outstanding (in shares) \| shares	639,608
Exchange ratio (in shares) \| shares	0.7642
Owens Corning equity awards issued for Masonite outstanding equity awards (in shares) \| shares	488,778
10-day weighted average closing share price of Owens Corning common stock (in dollars per share) \| $ / shares	$ 174.03
Fair value of Owens Corning time vesting RSUs issued for Masonite outstanding equity awards \| $	$ 85
Less: Estimated fair value allocated to post-transaction compensation expense \| $	(50)
Fair value of awards included in transaction consideration \| $	$ 35

ACQUISITIONS - Preliminary Acqu

ACQUISITIONS - Preliminary Acquisition Date Fair Value of Net Intangible Assets Acquired, Net Of Liabilities Assumed (Details) - USD ($) $ in Millions	May 15, 2024	Sep. 30, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Goodwill		$ 2,867	$ 1,392
Masonite
Business Acquisition [Line Items]
Cash and cash equivalents	$ 282
Receivables, net	330
Inventories	379
Other current assets	82
Property, plant and equipment, net	861
Operating lease right-of-use assets	253
Intangible assets	1,358
Deferred income taxes	14
Other non-current assets	91
Total assets	3,650
Accounts payable	196
Current operating lease liabilities	28
Other current liabilities	184
Long-term debt	867
Non-current operating lease liabilities	235
Deferred income taxes	357
Other non-current liabilities	35
Net assets acquired	1,748
Non-controlling interest	(35)
Goodwill	1,473
Total net assets acquired	3,186
Masonite \| As originally reported
Business Acquisition [Line Items]
Cash and cash equivalents	282
Receivables, net	330
Inventories	379
Other current assets	82
Property, plant and equipment, net	861
Operating lease right-of-use assets	253
Intangible assets	1,579
Deferred income taxes	14
Other non-current assets	91
Total assets	3,871
Accounts payable	196
Current operating lease liabilities	28
Other current liabilities	187
Long-term debt	867
Non-current operating lease liabilities	235
Deferred income taxes	413
Other non-current liabilities	32
Net assets acquired	1,913
Non-controlling interest	(35)
Goodwill	1,308
Total net assets acquired	3,186
Masonite \| Measurement period adjustments
Business Acquisition [Line Items]
Cash and cash equivalents	0
Receivables, net	0
Inventories	0
Other current assets	0
Property, plant and equipment, net	0
Operating lease right-of-use assets	0
Intangible assets	(221)	(221)
Deferred income taxes	0
Other non-current assets	0
Total assets	(221)
Accounts payable	0
Current operating lease liabilities	0
Other current liabilities	(3)
Long-term debt	0
Non-current operating lease liabilities	0
Deferred income taxes	(56)
Other non-current liabilities	3
Net assets acquired	(165)
Non-controlling interest	0
Goodwill	165	$ 165
Total net assets acquired	0
Masonite \| Trademarks and trade names (indefinite-lived)
Business Acquisition [Line Items]
Intangible assets	240
Masonite \| Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 979
Masonite \| Customer relationships \| Minimum
Business Acquisition [Line Items]
Estimated Useful Life (in years)	10 years
Masonite \| Customer relationships \| Maximum
Business Acquisition [Line Items]
Estimated Useful Life (in years)	21 years
Masonite \| Technology
Business Acquisition [Line Items]
Intangible assets	$ 120
Estimated Useful Life (in years)	5 years
Masonite \| Trademarks and trade names (indefinite-lived)
Business Acquisition [Line Items]
Intangible assets	$ 19
Estimated Useful Life (in years)	10 years

ACQUISITIONS - Pro Forma Financ

ACQUISITIONS - Pro Forma Financial Information (Details) - Masonite - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Business Acquisition [Line Items]
Net sales	$ 3,046	$ 3,099	$ 9,035	$ 9,275
Net earnings	$ 327	$ 339	$ 1,004	$ 993

DIVESTITURES (Details)

DIVESTITURES (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
DIVESTITURES (Details) - USD ($) $ in Millions	Mar. 03, 2023	Mar. 31, 2023	Sep. 30, 2021	Dec. 31, 2022
CALIFORNIA \| Santa Clara Insulation Site
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of business	$ 234
Non-refundable deposit			$ 50
Gain on sale		$ 189
Disposal Group, Held-for-sale, Not Discontinued Operations \| Chambery, France Manufacturing Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax charge				$ 30

WARRANTIES (Details)

WARRANTIES (Details) - USD ($) $ in Millions	9 Months Ended
WARRANTIES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Movement In Standard And Extended Product Warranty Increase Decrease Roll Forward
Product warranty accrual, beginning balance	$ 97	$ 88
Amounts accrued for current year	15	18
Acquired obligations	4	0
Settlements of warranty claims	(17)	(10)
Product warranty accrual, ending balance	$ 99	$ 96

RESTRUCTURING, ACQUISITION AN_3

RESTRUCTURING, ACQUISITION AND DIVESTITURE-RELATED COSTS (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 03, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2021	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2023	May 31, 2023	Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ (56)	$ (41)		$ (185)	$ 83
Revenues		(3,046)	(2,479)		(8,135)	(7,373)
Masonite
Restructuring Cost and Reserve [Line Items]
Acquisition related costs		2			49
Masonite \| Adjustment, Removal Of Sales Of Architectural Segment
Restructuring Cost and Reserve [Line Items]
Revenues			83		119	268
Disposal Group, Held-for-sale, Not Discontinued Operations \| Chambery, France Manufacturing Assets
Restructuring Cost and Reserve [Line Items]
Pre-tax charge							$ 30
Santa Clara Insulation Site \| CALIFORNIA
Restructuring Cost and Reserve [Line Items]
Proceeds from divestiture of business	$ 234
Non-refundable deposit				$ 50
Protective Packaging Exit
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(4)	(61)
Restructuring reserve		0	12		0	12	0	$ 1
Payments					(3)	0
Accelerated depreciation and other non-cash items					(2)	(49)
Cumulative charges incurred		82	61		82	61
Wabash, Indiana Facility Closure
Restructuring Cost and Reserve [Line Items]
Restructuring costs					0	(23)
Restructuring reserve		0	3		0	3	0	3
Payments					(3)	0
Accelerated depreciation and other non-cash items					0	(20)
Cumulative charges incurred		33	23		33	23
European Operating Structure Optimization
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost										$ 20
Severance costs					3
Restructuring costs					(3)	(12)
Restructuring reserve		5	8		5	8	0	6
Payments					(4)	(4)
Accelerated depreciation and other non-cash items					0	0
Cumulative charges incurred		15	12		15	12
Composites Strategic Realignment Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs						(3)
Restructuring reserve			1			1	1
Payments						(3)
Accelerated depreciation and other non-cash items						0
Cumulative charges incurred			12			12
Roofing Restructuring Actions
Restructuring Cost and Reserve [Line Items]
Restructuring costs					0	(2)
Restructuring reserve			0			0	0
Payments						(2)
Accelerated depreciation and other non-cash items						0
Cumulative charges incurred			10			10
Santa Clara Insulation Site
Restructuring Cost and Reserve [Line Items]
Restructuring costs					0	(5)
Restructuring reserve			0			0	$ 7
Payments						(11)
Accelerated depreciation and other non-cash items						(1)
Cumulative charges incurred			65			65
Global Composites Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(10)
Restructuring reserve		10			10			12
Payments					(4)
Accelerated depreciation and other non-cash items					(8)
Cumulative charges incurred		26			26
Acquisition-related Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(45)
Restructuring reserve		1			1			0
Payments					(21)
Accelerated depreciation and other non-cash items					(23)
Cumulative charges incurred		45			45
Accelerated depreciation \| Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs		(1)	(23)		(8)	(46)
Accelerated depreciation \| Protective Packaging Exit \| Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost									$ 70
Accelerated depreciation \| Protective Packaging Exit \| Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost									75
Accelerated depreciation \| Global Composites Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(8)
Accelerated depreciation \| Global Composites Restructuring \| Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost								15
Accelerated depreciation \| Global Composites Restructuring \| Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost								20
Employee Severance And Other Exit Costs \| Protective Packaging Exit
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost									$ 15
Employee Severance And Other Exit Costs \| Global Composites Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(2)
Employee Severance And Other Exit Costs \| Global Composites Restructuring \| Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost								20
Employee Severance And Other Exit Costs \| Global Composites Restructuring \| Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost								30
Other exit costs \| Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs		(1)	(7)		(6)	(15)
Other exit costs \| Marketing and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs		0	0		(1)	(1)
Other exit costs \| Other expense, net
Restructuring Cost and Reserve [Line Items]
Restructuring costs		0	0		0	(1)
Other exit costs \| Protective Packaging Exit
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(4)
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		16			16
Severance \| Other expense, net
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1	0		(47)	(25)
Severance \| Acquisition-related Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs					(22)
Employee Severance, Noncurrent
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		2			2
Employee Severance, Current
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		14			14
Acquisition-related transaction costs
Restructuring Cost and Reserve [Line Items]
Acquisition related costs		2	0		49	0
Acquisition-related transaction costs \| Masonite
Restructuring Cost and Reserve [Line Items]
Acquisition related costs					49
Acquisition-related transaction costs \| Other expense, net
Restructuring Cost and Reserve [Line Items]
Restructuring costs		(2)	0		(49)	0
Acquisition-related integration costs
Restructuring Cost and Reserve [Line Items]
Acquisition related costs		53	0		74	0
Acquisition-related integration costs \| Masonite
Restructuring Cost and Reserve [Line Items]
Acquisition related costs					74
Acquisition-related integration costs \| Other expense, net
Restructuring Cost and Reserve [Line Items]
Restructuring costs		(53)	0		(74)	0
Gain on sale of Santa Clara, California site \| Gain on sale of site
Restructuring Cost and Reserve [Line Items]
Restructuring costs		0	0		0	189
Accelerated amortization \| Other expense, net
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 0	$ (11)		0	$ (18)
Accelerated Vesting Of Equity Awards \| Acquisition-related Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs					$ (23)
Employee Severance And Accelerated Depreciation \| Wabash, Indiana Facility Closure
Restructuring Cost and Reserve [Line Items]
Restructuring cost, expected cost								$ 30

DEBT (Details)

DEBT (Details) - USD ($) $ in Millions								1 Months Ended	3 Months Ended
DEBT (Details) - USD ($) $ in Millions	May 16, 2024	May 15, 2024	Mar. 01, 2024	Aug. 12, 2019	Jun. 26, 2017	Aug. 08, 2016	Nov. 12, 2014	May 31, 2024	Mar. 31, 2018	Sep. 30, 2024	May 22, 2024	May 13, 2024	May 01, 2024	Apr. 15, 2024	Feb. 29, 2024	Dec. 31, 2023	May 12, 2020	Jan. 25, 2018	Oct. 31, 2006
Debt Instrument [Line Items]
Carrying Value										$ 5,465						$ 3,046
Fair Value										100%						100%
Fair Value										100%						99%
Other										$ 0						$ 1
Less – current portion of senior notes										400						399
Long-term debt, current maturities										37						32
Long-term debt, net of current portion										5,028						2,615
Short-term debt										$ 1						$ 1
Short-term debt, weighted average interest rate, at point in time										4%						5.10%
Masonite
Debt Instrument [Line Items]
Repayments of debt		$ 216
4.200% senior notes, net of discount and financing fees, due 2024
Debt Instrument [Line Items]
Long-term debt, percentage rate										4.20%
Carrying Value										$ 400						$ 399
Fair Value										100%						99%
Debt instrument, face amount							$ 400
3.400% senior notes, net of discount and financing fees, due 2026
Debt Instrument [Line Items]
Long-term debt, percentage rate										3.40%
Carrying Value										$ 399						$ 398
Fair Value										99%						96%
Debt instrument, face amount						$ 400
5.500% senior notes, net of discount and financing fees, due 2027
Debt Instrument [Line Items]
Long-term debt, percentage rate								5.50%		5.50%
Carrying Value										$ 497
Fair Value										103%
Debt instrument, face amount								$ 500
Debt issuance costs								$ 4
5.375% senior notes, net of discount and financing fees, due 2028
Debt Instrument [Line Items]
Long-term debt, percentage rate										5.375%
Carrying Value										$ 29
Fair Value										100%
5.375% senior notes, net of discount and financing fees, due 2028 \| Masonite
Debt Instrument [Line Items]
Long-term debt, percentage rate														5.375%
Carrying Value														$ 29
Debt instrument, face amount														$ 501
Repayments of debt	$ 480
Percentage of long-term debt tendered												94.25%
Interest expense	7
Premium on long-term debt	$ 1
3.950% senior notes, net of discount and financing fees, due 2029
Debt Instrument [Line Items]
Long-term debt, percentage rate										3.95%
Carrying Value										$ 447						$ 447
Fair Value										98%						95%
Debt instrument, face amount				$ 450
3.500% senior notes, net of discount and financing fees, due 2030
Debt Instrument [Line Items]
Long-term debt, percentage rate										3.50%
Carrying Value										$ 2
Fair Value										89%
3.500% senior notes, net of discount and financing fees, due 2030
Debt Instrument [Line Items]
Long-term debt, percentage rate										3.50%
Carrying Value										$ 336
Fair Value										95%
3.875% senior notes, net of discount and financing fees, due 2030
Debt Instrument [Line Items]
Long-term debt, percentage rate										3.875%
Carrying Value										$ 298						$ 298
Fair Value										97%						94%
Debt instrument, face amount																	$ 300
5.700% senior notes, net of discount and financing fees, due 2034
Debt Instrument [Line Items]
Long-term debt, percentage rate								5.70%		5.70%
Carrying Value										$ 789
Fair Value										106%
Debt instrument, face amount								$ 800
Debt issuance costs								$ 11
7.000% senior notes, net of discount and financing fees, due 2036
Debt Instrument [Line Items]
Long-term debt, percentage rate										7%
Carrying Value										$ 369						$ 369
Fair Value										117%						116%
Debt instrument, face amount																			$ 550
Repayments of debt				34	$ 140
4.300% senior notes, net of discount and financing fees, due 2047
Debt Instrument [Line Items]
Long-term debt, percentage rate										4.30%
Carrying Value										$ 589						$ 589
Fair Value										85%						88%
Debt instrument, face amount					600
4.400% senior notes, net of discount and financing fees, due 2048
Debt Instrument [Line Items]
Long-term debt, percentage rate										4.40%
Carrying Value										$ 391						$ 391
Fair Value										85%						87%
Debt instrument, face amount																		$ 400
5.950% senior notes, net of discount and financing fees, due 2054
Debt Instrument [Line Items]
Long-term debt, percentage rate								5.95%		5.95%
Carrying Value										$ 683
Fair Value										106%
Debt instrument, face amount								$ 700
Debt issuance costs								17
Various finance leases, due through 2032
Debt Instrument [Line Items]
Carrying Value										$ 236						$ 154
Fair Value										100%						100%
Senior Notes Due 2022
Debt Instrument [Line Items]
Repayments of debt				$ 416
Senior Notes Due 2019
Debt Instrument [Line Items]
Repayments of debt					$ 144		105
Senior Notes Due 2016
Debt Instrument [Line Items]
Repayments of debt						$ 158	$ 242
Senior Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from issuance of debt									$ 600
Line of credit facility, maximum borrowing capacity			$ 1,000							$ 1,000					$ 800
Outstanding borrowings										0
Receivables Securitization Facility
Debt Instrument [Line Items]
Debt instrument, face amount			300												$ 280
Line of credit facility, maximum borrowing capacity										300
Borrowings from lines of credit		$ 295
Outstanding borrowings										$ 0
364-Day Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 3,000
Debt instrument, term			364 days
364-Day Credit Facility \| Masonite
Debt Instrument [Line Items]
Borrowings from lines of credit								2,800
Financing costs								$ 16
Masonite 2030 Notes \| Masonite
Debt Instrument [Line Items]
Long-term debt, percentage rate													3.50%
Carrying Value													$ 2
Percentage of long-term debt tendered											99.51%
Owens Corning 2030 Notes \| Masonite
Debt Instrument [Line Items]
Long-term debt, percentage rate													3.50%
Debt instrument, face amount											$ 373

DEBT - Credit Facility (Details

DEBT - Credit Facility (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 01, 2024	Feb. 29, 2024
Senior Revolving Credit Facility
Debt Instrument [Line Items]
Facility size or borrowing limit	$ 1,000	$ 1,000	$ 800
Outstanding borrowings	0
Outstanding letters of credit	4
Availability on facility	996
Receivables Securitization Facility
Debt Instrument [Line Items]
Facility size or borrowing limit	300
Collateral capacity limitation on availability	0
Outstanding borrowings	0
Outstanding letters of credit	1
Availability on facility	$ 299
364-Day Credit Facility
Debt Instrument [Line Items]
Facility size or borrowing limit		$ 3,000

PENSION PLANS AND OTHER POSTR_3

PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2024
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Contributions by employer			$ 4
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1	$ 1	4	$ 4
Interest cost	7	12	23	36
Expected return on plan assets	(8)	(14)	(27)	(41)
Amortization of actuarial gain	2	2	5	6
Net periodic postretirement benefit income	2	1	5	5
Other Postretirement Benefits Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	0	0
Interest cost	1	1	4	4
Amortization of actuarial gain	(2)	(2)	(6)	(6)
Net periodic postretirement benefit income	(1)	(1)	(2)	(2)
U.S. \| Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	2	2
Interest cost	4	8	13	24
Expected return on plan assets	(5)	(10)	(17)	(30)
Amortization of actuarial gain	1	1	2	4
Net periodic postretirement benefit income	1	0	0	0
Non-U.S. \| Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	2	2
Interest cost	3	4	10	12
Expected return on plan assets	(3)	(4)	(10)	(11)
Amortization of actuarial gain	1	1	3	2
Net periodic postretirement benefit income	$ 1	$ 1	$ 5	$ 5
Maximum \| Scenario, Forecast \| Non-U.S.
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Expected future employer contributions, current fiscal year					$ 20

CONTINGENT LIABILITIES AND OT_2

CONTINGENT LIABILITIES AND OTHER MATTERS (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) site
Unusual or Infrequent Item, or Both [Line Items]
Environmental liability sites \| site		23
Environmental exit costs, accrual \| $		$ 4
Environmental exit costs, accrual, current \| $		$ 2
Monetary sanctions \| $	$ 1
Superfund Site
Unusual or Infrequent Item, or Both [Line Items]
Environmental liability sites \| site		9
Owned or Formally Owned Sites
Unusual or Infrequent Item, or Both [Line Items]
Environmental liability sites \| site		14

STOCK COMPENSATION - Narrative

STOCK COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	May 15, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Feb. 08, 2024 $ / shares	Apr. 16, 2020 shares	Apr. 18, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense (less than)		$ 21	$ 11	$ 74	$ 38
Maximum employee subscription rate								85%
Acquisition-related Restructuring
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated depreciation and other non-cash items				$ 23
Masonite
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exchange ratio (in shares) \| shares	0.7642
Purchase price (in dollars per share) \| $ / shares	$ 133					$ 133
10-day weighted average closing share price of Owens Corning common stock (in dollars per share) \| $ / shares	$ 174.03
Fair value of Owens Corning time vesting RSUs issued for Masonite outstanding equity awards	$ 85
Fair value of awards included in transaction consideration	35
Post-combination expense	$ 50
Internal Based Performance Metric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Grant date fair value of units granted \| $ / shares				$ 147.18	$ 92.97
External Based Performance Metric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee emergence equity program expense		2	$ 1	$ 6	$ 5
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year 11 months 1 day
Granted, weighted average grant date fair value \| $ / shares				$ 154.60
Compensation cost not yet recognized		$ 65		$ 65
Vested in period, fair value				$ 73	$ 24
Restricted Stock Units (RSUs) \| Masonite
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant \| shares		600,000		600,000
Vesting period				1 year 9 months 10 days
Shares converted (in shares) \| shares	300,000
Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Restricted Stock Units (RSUs), Converted Masonite Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		$ 20		$ 20
Restricted Stock Units (RSUs), Owens Corning Stock Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		45		$ 45
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year 9 months 3 days
Granted, weighted average grant date fair value \| $ / shares				$ 161.12
Compensation cost not yet recognized		20		$ 20
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		$ 1		$ 1
Offering period (in months)				6 months
Performance Restricted Stock Units ("PRSUs") \| Masonite
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares converted (in shares) \| shares	200,000
Performance Restricted Stock Units ("PRSUs") \| Masonite \| Grant Tranche, One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares granted	107.33%
Performance Restricted Stock Units ("PRSUs") \| Masonite \| Grant Tranche, Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares granted	100%
Performance Restricted Stock Units ("PRSUs") \| Masonite \| Grant Tranche, Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares granted	122%
2023 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant \| shares		3,000,000		3,000,000
Internal Based Performance Metric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock payout minimum				0
Performance stock payout range maximum				2
External Based Performance Metric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Performance stock payout minimum				0
Performance stock payout range maximum				2
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant \| shares		3,100,000		3,100,000			4,200,000
Performance Stock Units (PSUs) 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility				33.88%	44.66%
Risk free interest rate				3.94%	3.75%
Expected term (in years)				2 years 10 months 28 days	2 years 10 months 28 days
Grant date fair value of units granted \| $ / shares				$ 195.95	$ 119.33

STOCK COMPENSATION - Restricted

STOCK COMPENSATION - Restricted Stock Unit (Details) - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at December 31, 2023 \| shares	1,225,668
Granted (in shares) \| shares	227,843
Assumed (converted Masonite equity awards) (in shares) \| shares	488,778
Vested (in shares) \| shares	(609,245)
Forfeited (in shares) \| shares	(36,528)
Balance at September 30, 2024 \| shares	1,296,516
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Balance at December 31, 2023 \| $ / shares	$ 79.72
Granted, weighted average grant date fair value \| $ / shares	154.60
Assumed (converted Masonite equity awards), weighted average grant date fair value \| $ / shares	174.03
Vested, weighted average grant date fair value \| $ / shares	120.58
Forfeited, weighted average grant date fair value \| $ / shares	119.20
Balance at September 30, 2024 \| $ / shares	$ 108.12

STOCK COMPENSATION - Grant Date

STOCK COMPENSATION - Grant Date Fair Value Of Units Granted (Details) - $ / shares	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Internal Based Performance Metric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of units granted	$ 147.18	$ 92.97

STOCK COMPENSATION - Performanc

STOCK COMPENSATION - Performance Stock Units (Details) - Performance Stock Units (PSUs)	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at December 31, 2023 \| shares	268,677
Granted (in shares) \| shares	95,997
Vested (in shares) \| shares	(9,063)
Forfeited (in shares) \| shares	(16,152)
Balance at September 30, 2024 \| shares	339,459
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Balance at December 31, 2023 \| $ / shares	$ 100.57
Granted, weighted average grant date fair value \| $ / shares	161.12
Vested, weighted average grant date fair value \| $ / shares	109.17
Forfeited, weighted average grant date fair value \| $ / shares	105.34
Balance at September 30, 2024 \| $ / shares	$ 117.24

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 01, 2022
Earnings Per Share [Abstract]
Net earnings attributable to Owens Corning	$ 321	$ 285	$ 299	$ 337	$ 345	$ 383	$ 905	$ 1,065
Weighted-average number of shares outstanding used for basic earnings per share	87,000,000			90,000,000			87,200,000	90,600,000
Non-vested restricted stock units and performance share units	900,000			900,000			800,000	900,000
Weighted-average number of shares outstanding and common equivalent shares used for diluted earnings per share	87,900,000			90,900,000			88,000,000	91,500,000
Basic (in dollars per share)	$ 3.69			$ 3.74			$ 10.38	$ 11.75
Diluted (in dollars per share)	$ 3.65			$ 3.71			$ 10.28	$ 11.64
Antidilutive securities excluded from computation of earnings per share amount	0			0			0	0
Equity Class Of Treasury Stock [Line Items]
Net Income (Loss) Attributable to Parent	$ 321	$ 285	$ 299	$ 337	$ 345	$ 383	$ 905	$ 1,065
Combined Repurchase Programs
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased	6,900,000						6,900,000		10,000,000
Stock repurchased during period, shares							2,100,000	3,600,000
Payments for repurchase of equity							$ 332	$ 391

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
INCOME TAXES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 120	$ 110	$ 318	$ 361
Effective tax rate	27%	25%	26%	25%
U.S. federal statutory tax rate	21%	21%	21%	21%

CHANGES IN ACCUMULATED OTHER _3

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE DEFICIT (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total AOCI beginning balance			$ (503)
Other comprehensive income (loss), net of tax	$ 65	$ (66)	(31)	$ (23)
Amounts classified into AOCI, net of tax	1	5	11	11
Total AOCI ending balance	(531)	(703)	(531)	(703)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total AOCI beginning balance	(421)	(339)	(318)	(380)
Gain (loss) on foreign currency translation	69	(73)	(34)	(32)
Other comprehensive income (loss), net of tax	69	(73)	(34)	(32)
Total AOCI ending balance	(352)	(412)	(352)	(412)
Pension and Other Postretirement Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total AOCI beginning balance	(197)	(304)	(196)	(301)
Other comprehensive income (loss), net of tax	(4)	2	(5)	(1)
Amounts reclassified from AOCI to net earnings, net of tax	0	0	(1)	0
Amounts classified into AOCI, net of tax	(4)	2	(4)	(1)
Total AOCI ending balance	(201)	(302)	(201)	(302)
Hedging Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total AOCI beginning balance	21	6	11	0
Other comprehensive income (loss), net of tax	1	5	11	11
Amounts reclassified from AOCI to net earnings, net of tax	2	8	12	32
Amounts classified into AOCI, net of tax	(1)	(3)	(1)	(21)
Total AOCI ending balance	$ 22	$ 11	$ 22	$ 11

SUBSEQUENT EVENTS - Narrative (

SUBSEQUENT EVENTS - Narrative (Details) - Subsequent Event - Building Materials Business $ in Millions	Nov. 04, 2024 USD ($) manufacturing_facility
Subsequent Event [Line Items]
Annual revenues \| $	$ 130
CHINA
Subsequent Event [Line Items]
Number of manufacturing facilities	6
KOREA, REPUBLIC OF
Subsequent Event [Line Items]
Number of manufacturing facilities	1