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Note 14 - Accumulated Other Comprehensive Loss - Components and Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Balance $ 2,902 $ 2,957 $ 3,171 $ 3,163 $ 2,957 $ 3,163
Other comprehensive income, net of tax 29   73 33 20 106
Balance 2,929 2,902 3,061 3,171 2,929 3,061
Huntsman International LLC [Member]            
Balance 2,906 2,964 3,173 3,170 2,964 3,170
Other comprehensive income, net of tax 29 (10) 73 33 19 106
Balance 2,933 2,906 3,068 3,173 2,933 3,068
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]            
Balance   (543) [1]   (675) [2] (543) [1] (675) [2]
Other comprehensive income before reclassifications, gross         4 [1] 94 [2]
Tax impact         (1) [1] 9 [2]
Amounts reclassified from accumulated other comprehensive loss, gross         7 [1],[3] 0 [2],[4]
Tax impact         0 [1] 0 [2]
Other comprehensive income, net of tax         10 [1] 103 [2]
Balance (533) [1]   (572) [2]   (533) [1] (572) [2]
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member]            
Balance   (547) [5]   (680) [6] (547) [5] (680) [6]
Other comprehensive income before reclassifications, gross         3 [5] 94 [6]
Tax impact         (1) [5] 9 [6]
Amounts reclassified from accumulated other comprehensive loss, gross         7 [3],[5] 0 [4],[6]
Tax impact         0 [5] 0 [6]
Other comprehensive income, net of tax         9 [5] 103 [6]
Balance (538) [5]   (577) [6]   (538) [5] (577) [6]
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]            
Balance   (490) [7]   (552) [8] (490) [7] (552) [8]
Other comprehensive income before reclassifications, gross         0 [7] (12) [8]
Tax impact         0 [7] 0 [8]
Amounts reclassified from accumulated other comprehensive loss, gross [9],[10] 5   6   10 [3],[7] 10 [4],[8]
Tax impact [9],[10] 0   (1)   (1) [7] (1) [8]
Other comprehensive income, net of tax         9 [7] (3) [8]
Balance (481) [7]   (555) [8]   (481) [7] (555) [8]
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member]            
Balance   (466) [11]   (528) [12] (466) [11] (528) [12]
Other comprehensive income before reclassifications, gross         0 [11] (12) [12]
Tax impact         0 [11] 0 [12]
Amounts reclassified from accumulated other comprehensive loss, gross [9],[13] 5   6   10 [3],[11] 10 [4],[12]
Tax impact [9],[13] 0   (1)   (1) [11] (1) [12]
Other comprehensive income, net of tax         9 [11] (3) [12]
Balance (457) [11]   (531) [12]   (457) [11] (531) [12]
Accumulated Other Comprehensive Income, Other, Net, Including Portion Attributable to Noncontrolling Interest [Member]            
Balance   4   0 4 0
Other comprehensive income before reclassifications, gross         1 6
Tax impact         0 0
Amounts reclassified from accumulated other comprehensive loss, gross         0 [3] 0 [4]
Tax impact         0 0
Other comprehensive income, net of tax         1 6
Balance 5   6   5 6
Accumulated Other Comprehensive Income, Other, Net, Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member]            
Balance   0   (4) 0 (4)
Other comprehensive income before reclassifications, gross         1 6
Tax impact         0 0
Amounts reclassified from accumulated other comprehensive loss, gross         0 [3] 0 [4]
Tax impact         0 0
Other comprehensive income, net of tax         1 6
Balance 1   2   1 2
Accumulated Other Comprehensive Income (Loss), Unconsolidated Affiliates Including Portion Attributable to Noncontrolling Interest [Member]            
Balance   (1,029)   (1,227) (1,029) (1,227)
Other comprehensive income before reclassifications, gross         5 88
Tax impact         (1) 9
Amounts reclassified from accumulated other comprehensive loss, gross         17 [3] 10 [4]
Tax impact         (1) (1)
Other comprehensive income, net of tax         20 106
Balance (1,009)   (1,121)   (1,009) (1,121)
Accumulated Other Comprehensive Income (Loss), Unconsolidated Affiliates Including Portion Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member]            
Balance   (1,013)   (1,212) (1,013) (1,212)
Other comprehensive income before reclassifications, gross         4 88
Tax impact         (1) 9
Amounts reclassified from accumulated other comprehensive loss, gross         17 [3] 10 [4]
Tax impact         (1) (1)
Other comprehensive income, net of tax         19 106
Balance (994)   (1,106)   (994) (1,106)
AOCI Attributable to Noncontrolling Interest [Member]            
Balance   23   27 23 27
Other comprehensive income before reclassifications, gross         (5) 0
Tax impact         0 0
Amounts reclassified from accumulated other comprehensive loss, gross         0 [3] 0 [4]
Tax impact         0 0
Other comprehensive income, net of tax         (5) 0
Balance 18   27   18 27
AOCI Attributable to Noncontrolling Interest [Member] | Huntsman International LLC [Member]            
Balance   23   27 23 27
Other comprehensive income before reclassifications, gross         (5) 0
Tax impact         0 0
Amounts reclassified from accumulated other comprehensive loss, gross         0 [3] 0 [4]
Tax impact         0 0
Other comprehensive income, net of tax         (5) 0
Balance 18   27   18 27
AOCI Attributable to Parent [Member]            
Balance (1,017) (1,006) (1,167) (1,200) (1,006) (1,200)
Other comprehensive income before reclassifications, gross         0 88
Tax impact         (1) 9
Amounts reclassified from accumulated other comprehensive loss, gross         17 [3] 10 [4]
Tax impact         (1) (1)
Other comprehensive income, net of tax 26   73 33 15 106
Balance (991) (1,017) (1,094) (1,167) (991) (1,094)
AOCI Attributable to Parent [Member] | Huntsman International LLC [Member]            
Balance (1,002) (990) (1,152) (1,185) (990) (1,185)
Other comprehensive income before reclassifications, gross         (1) 88
Tax impact         (1) 9
Amounts reclassified from accumulated other comprehensive loss, gross         17 [3] 10 [4]
Tax impact         (1) (1)
Other comprehensive income, net of tax 26 (12) 73 33 14 106
Balance $ (976) $ (1,002) $ (1,079) $ (1,152) $ (976) $ (1,079)
[1] Amounts are net of tax of $52 million as of both June 30, 2026 and January 1, 2026.
[2] Amounts are net of tax of $51 million and $60 million as of June 30, 2025 and January 1, 2025, respectively.
[3] 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.
[4] See tables below for details about pension and other postretirement benefits reclassifications.
[5] Amounts are net of tax of $39 million as of both June 30, 2026 and January 1, 2026.
[6] Amounts are net of tax of $38 million and $47 million as of June 30, 2025 and January 1, 2025, respectively.
[7] Amounts are net of tax of $49 million and $50 million as of June 30, 2026 and January 1, 2026, respectively.
[8] Amounts are net of tax of $60 million and $61 million as of June 30, 2025 and January 1, 2025, respectively.
[9] Details of amounts reclassified from accumulated other comprehensive loss relate only to pension and other postretirement benefits.
[10] Pension and other postretirement benefits amounts in parentheses indicate credits on our condensed consolidated statements of operations.
[11] Amounts are net of tax of $73 million and $74 million as of June 30, 2026 and January 1, 2026, respectively.
[12] Amounts are net of tax of $84 million and $85 million as of June 30, 2025 and January 1, 2025 respectively.
[13] Pension and other postretirement benefits amounts in parentheses indicate credits on our condensed consolidated statements of operations.