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FAIR VALUE MEASUREMENTS (Basis of Fair Value Measurements on a Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Assets at Fair Value $ 0us-gaap_CashAndCashEquivalentsFairValueDisclosure [1],[2] $ 0us-gaap_CashAndCashEquivalentsFairValueDisclosure [1],[2]
Interest in trade accounts receivable conduits, Assets at Fair Value 0us-gaap_InterestsContinuedToBeHeldByTransferorFairValue [1],[3] 0us-gaap_InterestsContinuedToBeHeldByTransferorFairValue [1],[3]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (90)us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset [1],[4] (20)us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset [1],[4]
Assets, at Fair Value (93)us-gaap_AssetsFairValueDisclosure [1] (23)us-gaap_AssetsFairValueDisclosure [1]
Long-term Debt, Liabilities at Fair Value 0us-gaap_LongTermDebtFairValue [1],[5] 0us-gaap_LongTermDebtFairValue [1],[5]
Interest Rate Derivative Liabilities, at Fair Value 0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue [1],[4] 0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue [1],[4]
Liabilities, at Fair Value (117)us-gaap_LiabilitiesFairValueDisclosure [1] (24)us-gaap_LiabilitiesFairValueDisclosure [1]
Estimate of Fair Value Measurement [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Assets at Fair Value 2,705us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Interest in trade accounts receivable conduits, Assets at Fair Value 1,328us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
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Commodities Derivative Assets, at Fair Value 3dow_CommodityContractAssetFairValueDisclosure
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Foreign currency Derivative, Assets at Fair Value 26us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
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Assets, at Fair Value 6,071us-gaap_AssetsFairValueDisclosure
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Long-term Debt, Liabilities at Fair Value 21,450us-gaap_LongTermDebtFairValue
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Liabilities, at Fair Value 21,614us-gaap_LiabilitiesFairValueDisclosure
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Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Assets at Fair Value 584us-gaap_MarketableSecurities
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Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Assets at Fair Value 0us-gaap_MarketableSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Assets at Fair Value 697us-gaap_MarketableSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Interest in trade accounts receivable conduits, Assets at Fair Value 0us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
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Commodities Derivative Assets, at Fair Value 0dow_CommodityContractAssetFairValueDisclosure
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Commodities Derivative Liabilities, at Fair Value 9dow_CommodityContractLiabilityFairValueDisclosure
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[1] Cash collateral amounts represent the estimated net settlement amount when applying netting and set-off rights included in master netting arrangements between the Company and its counterparties and the payable or receivable for cash collateral held or placed with the same counterparty.
[2] Treasury Bills and money market funds included in "Cash and cash equivalents" in the consolidated balance sheets and held at amortized cost, which approximates fair value.
[3] Included in "Accounts and notes receivable – Other" in the consolidated balance sheets. See Note 15 for additional information on transfers of financial assets.
[4] See Note 10 for the classification of derivatives in the consolidated balance sheets.
[5] See Note 10 for information on fair value measurements of long-term debt.
[6] The Company’s investments in equity and debt securities are primarily classified as available-for-sale and are included in “Other investments” in the consolidated balance sheets.
[7] U.S. Treasury obligations, U.S. agency obligations, agency mortgage-backed securities and other municipalities’ obligations.