SEGMENT INFORMATION - Additions to Property, Plant and Equipment (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | $ 191 | $ 145 | $ 595 | $ 503 |
| Segment Reporting, Reconciling Item, Corporate Nonsegment | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 19 | 16 | 59 | 44 |
| Insulation | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 91 | 65 | 282 | 226 |
| Roofing | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 63 | 46 | 189 | 174 |
| Total Segments | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 172 | 129 | 536 | 459 |
| Doors | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | $ 18 | $ 18 | $ 65 | $ 59 |