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NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES (Schedule of Committed and Available Credit Facilities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 6,300us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Remaining Borrowing Capacity 6,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Five Year Competitive Advance and Revolving Credit Facility Agreement [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 5,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_FiveYearCompetitiveAdvanceAndRevolvingCreditFacilityAgreementMember		 [1]
Line of Credit Facility, Remaining Borrowing Capacity 5,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_FiveYearCompetitiveAdvanceAndRevolvingCreditFacilityAgreementMember		 [1]
$100M Revolving Credit Facility Due 3/2016 [Domain]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 100us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A100MRevolvingCreditFacilityDue32016Domain
Line of Credit Facility, Remaining Borrowing Capacity 100us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A100MRevolvingCreditFacilityDue32016Domain
$300M Revolving Credit Facility Due 10/2016 [Domain]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 300us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A300MRevolvingCreditFacilityDue102016Domain
Line of Credit Facility, Remaining Borrowing Capacity 300us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A300MRevolvingCreditFacilityDue102016Domain
Term Loan Facility [Domain]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 300us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_TermLoanFacilityDomain
Line of Credit Facility, Remaining Borrowing Capacity 0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_TermLoanFacilityDomain
$200M Revolving Credit Facility due 4/2016 [Domain]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 200us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A200MRevolvingCreditFacilityDue42016Domain
Line of Credit Facility, Remaining Borrowing Capacity 200us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A200MRevolvingCreditFacilityDue42016Domain
$200 Million Revolving Credit Facility Due 10/2016 [Domain]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 200us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A200MillionRevolvingCreditFacilityDue102016Domain
Line of Credit Facility, Remaining Borrowing Capacity 200us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A200MillionRevolvingCreditFacilityDue102016Domain
$100 Million Revolving Credit Facility Due 10/2016 [Domain]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 100us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A100MillionRevolvingCreditFacilityDue102016Domain
Line of Credit Facility, Remaining Borrowing Capacity 100us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A100MillionRevolvingCreditFacilityDue102016Domain
$100 Million 1/2014 Revolving Credit Facility Due 10/2016 [Domain]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 100us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A100MillionRevolvingCreditFacilityEffective012014Due102016Domain
Line of Credit Facility, Remaining Borrowing Capacity $ 100us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dow_A100MillionRevolvingCreditFacilityEffective012014Due102016Domain
[1] The prior credit facility was terminated and replaced with a new credit facility on March 24, 2015.