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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: