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Note 7 - Restructuring, Impairment and Plant Closing Costs - Cash and Noncash Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Cash charges, net	$ 6	$ 43	$ 11	$ 43
Asset, Impairment Loss	0	77	0	77
Accelerated depreciation	2	4	3	6
Other noncash charges (credits), net	1	0	1	(1)
Total restructuring, impairment and plant closing credits	$ 9	$ 124	$ 15	$ 125

X

- Definition

Amount of restructuring cash changes associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	hun_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate amount provided for estimated restructuring charges, asset impairment loss and plant closing cost incurred during an accounting period.

+ References

No definition available.

+ Details

Name:	hun_RestructuringImpairmentAndPlantClosingCosts
Namespace Prefix:	hun_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of other non-cash charges associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

No definition available.

+ Details

Name:	hun_RestructuringReserveOtherNonCashCharges
Namespace Prefix:	hun_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of impairment loss for asset. Includes, but is not limited to, tangible and intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480095/942-10-S50-1

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
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-Name Accounting Standards Codification
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-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480035/942-10-S99-6

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration