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DIVESTITURES (Divestiture of ANGUS Chemical Company) (Details) (Subsequent Event [Member], Performance Materials & Chemicals [Member], ANGUS Chemical Company [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Subsequent Event [Member] | Performance Materials & Chemicals [Member] | ANGUS Chemical Company [Member]
  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Proceeds from Divestiture of Businesses $ 1,215us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= dow_ANGUSChemicalCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= dow_PerformanceMaterialsChemicalsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember