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SEGMENT INFORMATION (Details) $ in Millions	2 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 segment	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting, Significant Reconciling Item [Line Items]
Number of reportable segments | segment			3		3
Disaggregated revenue		$ 2,747		$ 2,497	$ 5,277	$ 4,514
EARNINGS FROM CONTINUING OPERATIONS BEFORE INTEREST AND TAXES		505		419	912	795
Depreciation and amortization		(172)		(142)	(331)	(250)
Restructuring excluding depreciation		(9)		(34)	(12)	(44)
Gains on sale of certain precious metals		12		0	21	0
Paroc marine recall		(1)		(6)	(2)	(7)
Strategic review-related charges		0		(15)	0	(17)
Gain (Loss) on Disposition of Business		(24)		0	(26)	0	$ (91)
Recognition of acquisition inventory fair value step-up		0		(12)	0	(12)
General corporate expense and other		(54)		(66)	(114)	(112)
Interest Expense, Operating and Nonoperating		(63)		(63)	(127)	(79)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		442		356	785	716
Acquisition-related transaction costs
Segment Reporting, Significant Reconciling Item [Line Items]
Acquisition-related transaction costs		0		(29)	0	(47)
Acquisition-related integration costs
Segment Reporting, Significant Reconciling Item [Line Items]
Acquisition-related transaction costs		(4)		(21)	(6)	(21)
Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		2,791		2,537	5,360	4,592
Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		(44)		(40)	(83)	(78)
EARNINGS FROM CONTINUING OPERATIONS BEFORE INTEREST AND TAXES		(80)		(183)	(139)	(260)
Europe
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		292		263	560	486
Europe | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		293		263	563	487
Europe | Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		(1)		0	(3)	(1)
Asia Pacific
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		36		41	65	72
Asia Pacific | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		36		41	65	72
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		8		6	17	11
Rest of world | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		8		6	17	11
Rest of world | Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		0		0	0	0
North America
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		2,411		2,187	4,635	3,945
North America | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		2,454		2,227	4,715	4,022
North America | Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		(43)		(40)	(80)	(77)
North America | Residential
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		1,923		1,711	3,717	3,036
North America | Residential | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		1,963		1,748	3,792	3,106
North America | Residential | Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		(40)		(37)	(75)	(70)
North America | Commercial and Industrial Sector
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		488		476	918	909
North America | Commercial and Industrial Sector | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		491		479	923	916
North America | Commercial and Industrial Sector | Eliminations
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		(3)		(3)	(5)	(7)
Roofing | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		1,303		1,252	2,423	2,350
EARNINGS FROM CONTINUING OPERATIONS BEFORE INTEREST AND TAXES		457		437	789	775
Roofing | Europe | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		55		49	103	98
Roofing | Asia Pacific | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		2		3	6	6
Roofing | Rest of world | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		0		0	0	0
Roofing | North America | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		1,246		1,200	2,314	2,246
Roofing | North America | Residential | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		1,128		1,088	2,096	2,048
Roofing | North America | Commercial and Industrial Sector | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		118		112	218	198
Insulation | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		934		974	1,843	1,931
EARNINGS FROM CONTINUING OPERATIONS BEFORE INTEREST AND TAXES		225		246	450	469
Insulation | Europe | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		180		184	346	359
Insulation | Asia Pacific | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		31		37	56	65
Insulation | Rest of world | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		4		3	8	8
Insulation | North America | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		719		750	1,433	1,499
Insulation | North America | Residential | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		346		383	728	781
Insulation | North America | Commercial and Industrial Sector | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		373		367	705	718
Doors | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue	$ 311	554			1,094	311
EARNINGS FROM CONTINUING OPERATIONS BEFORE INTEREST AND TAXES		75		61	143	61
Doors | Europe | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		58		30	114	30
Doors | Asia Pacific | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		3		1	3	1
Doors | Rest of world | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		4		3	9	3
Doors | North America | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		489		277	968	277
Doors | North America | Residential | Operating Segments
Segment Reporting, Significant Reconciling Item [Line Items]
Disaggregated revenue		489		277	968	277
Doors | North America | Commercial and Industrial Sector | Operating Segments
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 FROM CONTINUING OPERATIONS BEFORE INTEREST AND TAXES		$ 757		$ 744	$ 1,382	$ 1,305

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-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

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