SEGMENTS AND GEOGRAPHIC REGIONS Significant Items (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Digitalization program costs	$ (62)	$ (40)	$ (154)	$ (121)
Restructuring Charges	(11)	(16)	(31)	(69)
Russia and Ukraine Conflict Asset Related Charges	0		(186)
Gain (Loss) on Extinguishment of Debt	0	(472)	(8)	(574)
Charges related to separation, distribution and tax matters agreements	(7)	0	(3)	(5)
Other Nonrecurring (Income) Expense	(80)	(474)	(382)	(715)
Luxi Chemical Group Breach of Contract Matter [Member]
Segment Reporting Information [Line Items]
Gain (Loss) Related to Litigation Settlement		54		54
Packaging & Specialty Plastics [Member]
Segment Reporting Information [Line Items]
Digitalization program costs	0	0	0	0
Restructuring Charges	0	0	0	(8)
Russia and Ukraine Conflict Asset Related Charges	0		(31)
Gain (Loss) on Extinguishment of Debt	0	0	0	0
Charges related to separation, distribution and tax matters agreements	0	0	0	0
Other Nonrecurring (Income) Expense	0	0	(31)	(8)
Packaging & Specialty Plastics [Member] \| Luxi Chemical Group Breach of Contract Matter [Member]
Segment Reporting Information [Line Items]
Gain (Loss) Related to Litigation Settlement		0		0
Industrial Intermediates & Infrastructure [Member]
Segment Reporting Information [Line Items]
Digitalization program costs	0	0	0	0
Restructuring Charges	0	0	0	(1)
Russia and Ukraine Conflict Asset Related Charges	0		(109)
Gain (Loss) on Extinguishment of Debt	0	0	0	0
Charges related to separation, distribution and tax matters agreements	0	0	0	0
Other Nonrecurring (Income) Expense	0	54	(109)	53
Industrial Intermediates & Infrastructure [Member] \| Luxi Chemical Group Breach of Contract Matter [Member]
Segment Reporting Information [Line Items]
Gain (Loss) Related to Litigation Settlement		54		54
Performance Materials & Coatings [Member]
Segment Reporting Information [Line Items]
Digitalization program costs	0	0	0	0
Restructuring Charges	0	0	0	(10)
Russia and Ukraine Conflict Asset Related Charges	0		(16)
Gain (Loss) on Extinguishment of Debt	0	0	0	0
Charges related to separation, distribution and tax matters agreements	0	0	0	0
Other Nonrecurring (Income) Expense	0	0	(16)	(10)
Performance Materials & Coatings [Member] \| Luxi Chemical Group Breach of Contract Matter [Member]
Segment Reporting Information [Line Items]
Gain (Loss) Related to Litigation Settlement		0		0
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Digitalization program costs	(62)	(40)	(154)	(121)
Restructuring Charges	(11)	(16)	(31)	(50)
Russia and Ukraine Conflict Asset Related Charges	0		(30)
Gain (Loss) on Extinguishment of Debt	0	(472)	(8)	(574)
Charges related to separation, distribution and tax matters agreements	(7)	0	(3)	(5)
Other Nonrecurring (Income) Expense	$ (80)	(528)	$ (226)	(750)
Corporate Segment [Member] \| Luxi Chemical Group Breach of Contract Matter [Member]
Segment Reporting Information [Line Items]
Gain (Loss) Related to Litigation Settlement		$ 0		$ 0

Charges related to separation, distribution and tax matters agreements

No definition available.

Name:	dow_Chargesrelatedtoseparationdistributionandtaxmattersagreements
Namespace Prefix:	dow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Digitalization program costs

+ References

No definition available.

+ Details

Name:	dow_DigitalizationProgramCosts
Namespace Prefix:	dow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Russia and Ukraine Conflict Asset Related Charges

+ References

No definition available.

+ Details

Name:	dow_RussiaAndUkraineConflictAssetRelatedCharges
Namespace Prefix:	dow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126972273&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126972273&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of other expense (income) that is infrequent in occurrence or unusual in nature.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_LitigationCaseAxis=dow_LuxiChemicalGroupBreachOfContractMatterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dow_PackagingSpecialtyPlasticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dow_IndustrialIntermediatesInfrastructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dow_PerformanceMaterialsCoatingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: