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Note 14 - Accumulated Other Comprehensive Loss - Reclassification Details (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
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) $ (2) $ (4) $ (4)
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) (2) (4) (4)
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] 7 8 14 15
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] 7 8 14 15
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Amounts reclassified from accumulated other comprehensive loss, gross [1],[2] 5 6 10 [5],[6] 10 [7],[8]
Tax impact [1],[2] 0 (1) (1) [5] (1) [7]
Total reclassifications for the period [1],[2] 5 5 9 9
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],[4] 5 6 10 [6],[9] 10 [8],[10]
Tax impact [1],[4] 0 (1) (1) [9] (1) [10]
Total reclassifications for the period [1],[4] $ 5 $ 5 9 9
Accumulated Defined Benefit Plans Adjustment, Settlement Gain (Loss), Including Portion Attributable to Noncontrolling Interest [Member]        
Amounts reclassified from accumulated other comprehensive loss, gross [1],[2],[3]     0 (1)
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],[3],[4]     $ 0 $ (1)
[1] Details of amounts reclassified from accumulated other comprehensive loss relate only to pension and other postretirement benefits.
[2] Pension and other postretirement benefits amounts in parentheses indicate credits on our condensed consolidated statements of operations.
[3] These accumulated other comprehensive loss components are included in the computation of net periodic pension costs. See “Note 12. Employee Benefit Plans.”
[4] Pension and other postretirement benefits amounts in parentheses indicate credits on our condensed consolidated statements of operations.
[5] Amounts are net of tax of $49 million and $50 million as of June 30, 2026 and January 1, 2026, respectively.
[6] The foreign currency translation adjustment reclassification amount related to the sale of our Gomet business and was recorded in gain on sale of business, net in our condensed consolidated statements of operations. See tables below for details about pension and other postretirement benefits reclassifications.
[7] Amounts are net of tax of $60 million and $61 million as of June 30, 2025 and January 1, 2025, respectively.
[8] See tables below for details about pension and other postretirement benefits reclassifications.
[9] Amounts are net of tax of $73 million and $74 million as of June 30, 2026 and January 1, 2026, respectively.
[10] Amounts are net of tax of $84 million and $85 million as of June 30, 2025 and January 1, 2025 respectively.