SEGMENT INFORMATION - Additions to Property, Plant and Equipment (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Segment Reporting Information [Line Items] | ||
| Property, plant and equipment, additions | $ 210 | $ 182 |
| Segment Reporting, Reconciling Item, Corporate Nonsegment | ||
| Segment Reporting Information [Line Items] | ||
| Property, plant and equipment, additions | 21 | 21 |
| Insulation | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Property, plant and equipment, additions | 102 | 81 |
| Roofing | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Property, plant and equipment, additions | 69 | 62 |
| Total Segments | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Property, plant and equipment, additions | 189 | 161 |
| Doors | Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Property, plant and equipment, additions | $ 18 | $ 18 |