Note 15 - Accumulated Other Comprehensive Loss - Reclassification Details (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||||||||||||||||||||||
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Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
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Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | [1],[2],[3] | $ (2) | $ (1) | $ (4) | $ (3) | |||||||||||||||||||||||
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | [1],[3],[4] | (2) | (1) | (4) | (3) | |||||||||||||||||||||||
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss), Including Portion Attributable to Noncontrolling Interest [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | [1],[2],[3] | 8 | 8 | 15 | 16 | |||||||||||||||||||||||
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss), Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | [1],[3],[4] | 8 | 8 | 15 | 16 | |||||||||||||||||||||||
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | [1],[3] | 6 | 7 | 10 | [5],[6] | 13 | [6],[7],[8] | |||||||||||||||||||||
Tax impact | [1],[3] | (1) | 0 | (1) | [5] | (1) | [7],[8] | |||||||||||||||||||||
Total reclassifications for the period | [1],[3] | 5 | 7 | 9 | 12 | |||||||||||||||||||||||
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | [1],[3] | 6 | 7 | 10 | [6],[9] | 13 | [6],[10],[11] | |||||||||||||||||||||
Tax impact | [1],[3] | (1) | 0 | (1) | [9] | (1) | [10],[11] | |||||||||||||||||||||
Total reclassifications for the period | [1],[3] | $ 5 | $ 7 | 9 | 12 | |||||||||||||||||||||||
Accumulated Defined Benefit Plans Adjustment, Settlement Gain (Loss), Including Portion Attributable to Noncontrolling Interest [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | (1) | 0 | ||||||||||||||||||||||||||
Accumulated Defined Benefit Plans Adjustment, Settlement Gain (Loss), Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member] | ||||||||||||||||||||||||||||
Amounts reclassified from accumulated other comprehensive loss, gross | $ (1) | $ 0 | ||||||||||||||||||||||||||
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