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Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Entity Shares Converted

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The total cost of shares issued to employees upon emergence from Chapter 11 proceedings, including both the recognition of the fair value of the shares over the requisite service period and any applicable company payroll taxes.

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Performance Stock Payout Minimum

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Restructuring Reserve, Accelerated Depreciation And Other Non-Cash Items

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Share-Based Compensation Arrangement By Share-Based Payment Award, Offering Period Of Shares Purchased

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Fair value of equity issued in a business combination.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period Type:

STOCK COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	May 15, 2024 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares	Feb. 08, 2024 $ / shares	Apr. 16, 2020 shares	Apr. 18, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee subscription rate								85.00%
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense (less than)		$ 18	$ 39	$ 39	$ 53
General and Administrative Expense \| Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense (less than)		16	37	36	50
General and Administrative Expense \| Discontinued Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense (less than)		2	2	3	3
Acquisition-related Restructuring
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated depreciation and other non-cash items				9	$ 21
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	$ 133.00					$ 133.00
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
Equity Issued in Business Combination, Post-Transaction Compensation Expense, Accelerated		26		$ 26
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				$ 171.94	$ 147.18
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	$ 2	$ 5	$ 4
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year 10 months 24 days
Compensation cost not yet recognized		$ 68		$ 68
Vested in period, fair value				$ 48	$ 64
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 4 months 6 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		$ 8		$ 8
Restricted Stock Units (RSUs), Owens Corning Stock Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		60		$ 60
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year 11 months 23 days
Compensation cost not yet recognized		26		$ 26
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		$ 3		$ 3
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	100.00%
Performance Restricted Stock Units ("PRSUs") \| Masonite \| Grant Tranche, Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares granted	122.00%
2023 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant \| shares		2,600,000		2,600,000
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		2,900,000		2,900,000			4,200,000
Performance Stock Units (PSUs) 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility				32.78%	33.88%
Risk free interest rate				4.14%	3.94%
Expected term (in years)				2 years 10 months 24 days	2 years 10 months 28 days
Grant date fair value of units granted \| $ / shares				$ 221.54	$ 195.95