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Note 17 - Stock-based Compensation Plan (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Three months ended |  |  | Six months ended |
|  | June 30, |  |  | June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Huntsman Corporation compensation cost |  | $ | 7 |  |  | $ | 7 |  |  | $ | 16 |  |  | $ | 16 |
Huntsman International compensation cost |  |  | 7 |  |  |  | 7 |  |  |  | 15 |  |  |  | 14 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | average |  |  |  |  |
|  |  |  |  |  | average |  |  | remaining |  |  | Aggregate |
|  |  |  |  |  | exercise |  |  | contractual |  |  | intrinsic |
Option awards |  | Shares |  |  | price |  |  | term |  |  | value |
|  | (in thousands) |  |  |  |  |  |  | (years) |  |  | (in millions) |
Outstanding at January 1, 2026 |  |  | 2,030 |  |  | $ | 22.42 |  |  |  |  |  |  |  |  |
Exercised |  |  | (241 | ) |  |  | 8.86 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (45 | ) |  |  | 19.93 |  |  |  |  |  |  |  |  |
Outstanding and exercisable at June 30, 2026 |  |  | 1,744 |  |  |  | 24.37 |  |  |  | 2.6 |  |  | $ | — |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Equity awards |  |  | Liability awards |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | average |  |  |  |  |  |  | average |
|  |  |  |  |  | grant-date |  |  |  |  |  |  | grant-date |
|  | Shares |  |  | fair value |  |  | Shares |  |  | fair value |
|  | (in thousands) |  |  |  |  |  |  | (in thousands) |  |  |  |  |
Nonvested at January 1, 2026 |  |  | 3,177 |  |  | $ | 24.63 |  |  |  | 295 |  |  | $ | 20.09 |
Granted |  |  | 2,153 |  |  |  | 15.27 |  |  |  | 297 |  |  |  | 13.27 |
Vested |  |  | (1,070 | ) | (1)(2) |  | 29.97 |  |  |  | (130 | ) |  |  | 22.07 |
Forfeited |  |  | (61 | ) |  |  | 17.57 |  |  |  | (6 | ) |  |  | 15.08 |
Nonvested at June 30, 2026 |  |  | 4,199 |  |  |  | 18.57 |  |  |  | 456 |  |  |  | 15.15 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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