SEGMENT INFORMATION - Additions to Property, Plant and Equipment (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | $ 194 | $ 176 | $ 404 | $ 358 |
| Segment Reporting, Reconciling Item, Corporate Nonsegment | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 19 | 7 | 40 | 28 |
| Insulation | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 89 | 80 | 191 | 161 |
| Roofing | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 57 | 66 | 126 | 128 |
| Total Segments | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | 175 | 169 | 364 | 330 |
| Doors | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Property, plant and equipment, additions | $ 29 | $ 23 | $ 47 | $ 41 |