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Note 14 - Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
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 income before reclassifications, gross |  |  | 4 |  |  |  | — |  |  |  | 1 |  |  |  | 5 |  |  |  | (5 | ) |  |  | — |
Tax impact |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Amounts reclassified from accumulated other comprehensive loss, gross(3) |  |  | 7 |  |  |  | 10 |  |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | 17 |
Tax impact |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Net current-period other comprehensive income |  |  | 10 |  |  |  | 9 |  |  |  | 1 |  |  |  | 20 |  |  |  | (5 | ) |  |  | 15 |
Ending balance, June 30, 2026 |  | $ | (533 | ) |  | $ | (481 | ) |  | $ | 5 |  |  | $ | (1,009 | ) |  | $ | 18 |  |  | $ | (991 | )
|  |  |  |  |  | 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 |  |  | 94 |  |  |  | (12 | ) |  |  | 6 |  |  |  | 88 |  |  |  | — |  |  |  | 88 |
Tax impact |  |  | 9 |  |  |  | — |  |  |  | — |  |  |  | 9 |  |  |  | — |  |  |  | 9 |
Amounts reclassified from accumulated other comprehensive loss, gross(3) |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |
Tax impact |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Net current-period other comprehensive income (loss) |  |  | 103 |  |  |  | (3 | ) |  |  | 6 |  |  |  | 106 |  |  |  | — |  |  |  | 106 |
Ending balance, June 30, 2025 |  | $ | (572 | ) |  | $ | (555 | ) |  | $ | 6 |  |  | $ | (1,121 | ) |  | $ | 27 |  |  | $ | (1,094 | )
|  |  |  |  |  | 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 income before reclassifications, gross |  |  | 3 |  |  |  | — |  |  |  | 1 |  |  |  | 4 |  |  |  | (5 | ) |  |  | (1 | )
Tax impact |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Amounts reclassified from accumulated other comprehensive loss, gross(3) |  |  | 7 |  |  |  | 10 |  |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | 17 |
Tax impact |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Net current-period other comprehensive income |  |  | 9 |  |  |  | 9 |  |  |  | 1 |  |  |  | 19 |  |  |  | (5 | ) |  |  | 14 |
Ending balance, June 30, 2026 |  | $ | (538 | ) |  | $ | (457 | ) |  | $ | 1 |  |  | $ | (994 | ) |  | $ | 18 |  |  | $ | (976 | )
|  |  |  |  |  | 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 |  |  | 94 |  |  |  | (12 | ) |  |  | 6 |  |  |  | 88 |  |  |  | — |  |  |  | 88 |
Tax impact |  |  | 9 |  |  |  | — |  |  |  | — |  |  |  | 9 |  |  |  | — |  |  |  | 9 |
Amounts reclassified from accumulated other comprehensive loss, gross(3) |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |
Tax impact |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Net current-period other comprehensive income (loss) |  |  | 103 |  |  |  | (3 | ) |  |  | 6 |  |  |  | 106 |  |  |  | — |  |  |  | 106 |
Ending balance, June 30, 2025 |  | $ | (577 | ) |  | $ | (531 | ) |  | $ | 2 |  |  | $ | (1,106 | ) |  | $ | 27 |  |  | $ | (1,079 | )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
|  | Three months ended June 30, |  |  |
|  | 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 |  |  |  | 8 |  | (3) | Other income, net
|  | 5 |  |  | 6 |  |  |
|  |  | — |  |  |  | (1 | ) |  | Income tax
Total reclassifications for the period |  | $ | 5 |  |  | $ | 5 |  |  |
|  | Six months ended June 30, |  |  |
|  | 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 |  | $ | (4 | ) |  | $ | (4 | ) | (3) | Other income, net
Actuarial loss |  |  | 14 |  |  |  | 15 |  | (3) | Other income, net
Settlement gain |  |  | — |  |  |  | (1 | ) | (3) | Other income, net
|  |  | 10 |  |  |  | 10 |  |  |
|  |  | (1 | ) |  |  | (1 | ) |  | Income tax
Total reclassifications for the period |  | $ | 9 |  |  | $ | 9 |  |  |
|  | Three months ended June 30, |  |  |
|  | 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 |  |  |  | 8 |  | (3) | Other income, net
|  | 5 |  |  | 6 |  |  |
|  |  | — |  |  |  | (1 | ) |  | Income tax
Total reclassifications for the period |  | $ | 5 |  |  | $ | 5 |  |  |
|  | Six months ended June 30, |  |  |
|  | 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 |  | $ | (4 | ) |  | $ | (4 | ) | (3) | Other income, net
Actuarial loss |  |  | 14 |  |  |  | 15 |  | (3) | Other income, net
Settlement gain |  |  | — |  |  |  | (1 | ) | (3) | Other income, net
|  |  | 10 |  |  |  | 10 |  |  |
|  |  | (1 | ) |  |  | (1 | ) |  | Income tax
Total reclassifications for the period |  | $ | 9 |  |  | $ | 9 |  |  |

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