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Note 14 - Accumulated Other Comprehensive Loss (Details Textual) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | --- | --- | ---
AOCI Tax, Attributable to Parent, Foreign Currency Translation Adjustments | $ 52 | $ 52 | $ 51 | $ 60
AOCI Tax, Attributable to Parent, Pension and Other Postretirement Benefit Adjustments | 49 | 50 | 60 | 61
Huntsman International LLC [Member] |  |  |  |
AOCI Tax, Attributable to Parent, Foreign Currency Translation Adjustments | 39 | 39 | 38 | 47
AOCI Tax, Attributable to Parent, Pension and Other Postretirement Benefit Adjustments | $ 73 | $ 74 | $ 84 | $ 85

X
- Definition Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) from foreign currency translation adjustments attributable to parent. + References No definition available. + Details
Name: | hun_AociTaxAttributableToParentForeignCurrencyTranslationAdjustments
Namespace Prefix: | hun_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) from pension and other postretirement benefit adjustments attributable to parent. + References No definition available. + Details
Name: | hun_AociTaxAttributableToParentPensionAndOtherPostretirementBenefitAdjustments
Namespace Prefix: | hun_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=hun_HuntsmanInternationalLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |