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Note 17 - Stock-based Compensation Plan - Compensation Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Compensation cost | $ 7 | $ 7 | $ 16 | $ 16
Huntsman International LLC [Member] |  |  |  |
Compensation cost | $ 7 | $ 7 | $ 15 | $ 14

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