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COMMITMENTS AND CONTINGENT LIABILITIES (Dow Corning Credit Facility) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jun. 02, 2004
Loss Contingencies [Line Items]    
Joint Plan credit facility $ 6,470us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Dow Corning Corporation [Member]    
Loss Contingencies [Line Items]    
Joint Plan credit facility   300us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember
Dow Corning Corporation [Member]    
Loss Contingencies [Line Items]    
Equity method investment, ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember		  
Credit Facility Provided To Joint Venture Reporting Entity Share [Member] | Dow Corning Corporation [Member]    
Loss Contingencies [Line Items]    
Joint Plan credit facility   $ 150us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= dow_CreditFacilityProvidedToJointVentureReportingEntityShareMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_CorporateJointVentureMember