| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
| | | | | | | Pension | | | | | | | | | | | | | | | | | |
| | | Foreign | | | and other | | | | | | | | | | | Amounts | | | Amounts | |
| | | currency | | | postretirement | | | | | | | | | | | attributable to | | | attributable to | |
| | | translation | | | benefits | | | | | | | | | | | noncontrolling | | | Huntsman | |
| | | adjustments(1) | | | adjustments(2) | | | Other, net | | | Total | | | interests | | | Corporation | |
| Beginning balance, January 1, 2026 | | $ | (543 | ) | | $ | (490 | ) | | $ | 4 | | | $ | (1,029 | ) | | $ | 23 | | | $ | (1,006 | ) |
| Other comprehensive loss before reclassifications, gross | | | (12 | ) | | | — | | | | — | | | | (12 | ) | | | (2 | ) | | | (14 | ) |
| Tax impact | | | (1 | ) | | | — | | | | — | | | | (1 | ) | | | — | | | | (1 | ) |
| Amounts reclassified from accumulated other comprehensive loss, gross(3) | | | — | | | | 5 | | | | — | | | | 5 | | | | — | | | | 5 | |
| Tax impact | | | — | | | | (1 | ) | | | — | | | | (1 | ) | | | — | | | | (1 | ) |
| Net current-period other comprehensive (loss) income | | | (13 | ) | | | 4 | | | | — | | | | (9 | ) | | | (2 | ) | | | (11 | ) |
| Ending balance, March 31, 2026 | | $ | (556 | ) | | $ | (486 | ) | | $ | 4 | | | $ | (1,038 | ) | | $ | 21 | | | $ | (1,017 | ) |
| | | | | | | Pension | | | | | | | | | | | | | | | | | |
| | | Foreign | | | and other | | | | | | | | | | | Amounts | | | Amounts | |
| | | currency | | | postretirement | | | | | | | | | | | attributable to | | | attributable to | |
| | | translation | | | benefits | | | | | | | | | | | noncontrolling | | | Huntsman | |
| | | adjustments(1) | | | adjustments(2) | | | Other, net | | | Total | | | interests | | | Corporation | |
| Beginning balance, January 1, 2025 | | $ | (675 | ) | | $ | (552 | ) | | $ | — | | | $ | (1,227 | ) | | $ | 27 | | | $ | (1,200 | ) |
| Other comprehensive income (loss) before reclassifications, gross | | | 32 | | | | (12 | ) | | | 6 | | | | 26 | | | | — | | | | 26 | |
| Tax impact | | | 3 | | | | — | | | | — | | | | 3 | | | | — | | | | 3 | |
| Amounts reclassified from accumulated other comprehensive loss, gross(3) | | | — | | | | 4 | | | | — | | | | 4 | | | | — | | | | 4 | |
| Tax impact | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Net current-period other comprehensive income (loss) | | | 35 | | | | (8 | ) | | | 6 | | | | 33 | | | | — | | | | 33 | |
| Ending balance, March 31, 2025 | | $ | (640 | ) | | $ | (560 | ) | | $ | 6 | | | $ | (1,194 | ) | | $ | 27 | | | $ | (1,167 | ) |
| | | | | | | Pension | | | | | | | | | | | | | | | | | |
| | | Foreign | | | and other | | | | | | | | | | | Amounts | | | Amounts | |
| | | currency | | | postretirement | | | | | | | | | | | attributable to | | | attributable to | |
| | | translation | | | benefits | | | | | | | | | | | noncontrolling | | | Huntsman | |
| | | adjustments(1) | | | adjustments(2) | | | Other, net | | | Total | | | interests | | | International | |
| Beginning balance, January 1, 2026 | | $ | (547 | ) | | $ | (466 | ) | | $ | — | | | $ | (1,013 | ) | | $ | 23 | | | $ | (990 | ) |
| Other comprehensive loss before reclassifications, gross | | | (13 | ) | | | — | | | | — | | | | (13 | ) | | | (2 | ) | | | (15 | ) |
| Tax impact | | | (1 | ) | | | — | | | | — | | | | (1 | ) | | | — | | | | (1 | ) |
| Amounts reclassified from accumulated other comprehensive loss, gross(3) | | | — | | | | 5 | | | | — | | | | 5 | | | | — | | | | 5 | |
| Tax impact | | | — | | | | (1 | ) | | | — | | | | (1 | ) | | | — | | | | (1 | ) |
| Net current-period other comprehensive (loss) income | | | (14 | ) | | | 4 | | | | — | | | | (10 | ) | | | (2 | ) | | | (12 | ) |
| Ending balance, March 31, 2026 | | $ | (561 | ) | | $ | (462 | ) | | $ | — | | | $ | (1,023 | ) | | $ | 21 | | | $ | (1,002 | ) |
| | | | | | | Pension | | | | | | | | | | | | | | | | | |
| | | Foreign | | | and other | | | | | | | | | | | Amounts | | | Amounts | |
| | | currency | | | postretirement | | | | | | | | | | | attributable to | | | attributable to | |
| | | translation | | | benefits | | | | | | | | | | | noncontrolling | | | Huntsman | |
| | | adjustments(1) | | | adjustments(2) | | | Other, net | | | Total | | | interests | | | International | |
| Beginning balance, January 1, 2025 | | $ | (680 | ) | | $ | (528 | ) | | $ | (4 | ) | | $ | (1,212 | ) | | $ | 27 | | | $ | (1,185 | ) |
| Other comprehensive income (loss) before reclassifications, gross | | | 32 | | | | (12 | ) | | | 6 | | | | 26 | | | | — | | | | 26 | |
| Tax impact | | | 3 | | | | — | | | | — | | | | 3 | | | | — | | | | 3 | |
| Amounts reclassified from accumulated other comprehensive loss, gross(3) | | | — | | | | 4 | | | | — | | | | 4 | | | | — | | | | 4 | |
| Tax impact | | | — | | | | — | | | | — | | | | — | | | | — | | | | — | |
| Net current-period other comprehensive income (loss) | | | 35 | | | | (8 | ) | | | 6 | | | | 33 | | | | — | | | | 33 | |
| Ending balance, March 31, 2025 | | $ | (645 | ) | | $ | (536 | ) | | $ | 2 | | | $ | (1,179 | ) | | $ | 27 | | | $ | (1,152 | ) |
|
| Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
| | | Three months ended March 31, | | | |
| | | 2026 | | | 2025 | | | |
| | | Amounts reclassified | | | Amounts reclassified | | | Affected line item in |
| | | from accumulated | | | from accumulated | | | the statement |
| Details about accumulated other | | other | | | other | | | where net income |
| comprehensive loss components(1)(2): | | comprehensive loss | | | comprehensive loss | | | is presented |
| Amortization of pension and other postretirement benefits: | | | | | | | | | | |
| Prior service credit | | $ | (2 | ) | | $ | (2 | ) | (3) | Other income, net |
| Actuarial loss | | | 7 | | | | 7 | | (3) | Other income, net |
| Settlement gain | | | — | | | | (1 | ) | (3) | Other income, net |
| | | 5 | | | 4 | | | |
| | | | (1 | ) | | | — | | | Income tax |
| Total reclassifications for the period | | $ | 4 | | | $ | 4 | | | |
| | | Three months ended March 31, | | | |
| | | 2026 | | | 2025 | | | |
| | | Amounts reclassified | | | Amounts reclassified | | | Affected line item in |
| | | from accumulated | | | from accumulated | | | the statement |
| Details about accumulated other | | other | | | other | | | where net income |
| comprehensive loss components(1)(2): | | comprehensive loss | | | comprehensive loss | | | is presented |
| Amortization of pension and other postretirement benefits: | | | | | | | | | | |
| Prior service credit | | $ | (2 | ) | | $ | (2 | ) | (3) | Other income, net |
| Actuarial loss | | | 7 | | | | 7 | | (3) | Other income, net |
| Settlement gain | | | — | | | | (1 | ) | (3) | Other income, net |
| | | 5 | | | 4 | | | |
| | | | (1 | ) | | | — | | | Income tax |
| Total reclassifications for the period | | $ | 4 | | | $ | 4 | | | |
|