Note 14 - Accumulated Other Comprehensive Loss (Details Textual) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|---|---|
| AOCI Tax, Attributable to Parent, Foreign Currency Translation Adjustments | $ 52 | $ 52 | $ 57 | $ 60 |
| AOCI Tax, Attributable to Parent, Pension and Other Postretirement Benefit Adjustments | 49 | 50 | 61 | 61 |
| Huntsman International LLC [Member] | ||||
| AOCI Tax, Attributable to Parent, Foreign Currency Translation Adjustments | 38 | 39 | 44 | 47 |
| AOCI Tax, Attributable to Parent, Pension and Other Postretirement Benefit Adjustments | $ 73 | $ 74 | $ 85 | $ 85 |