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NONCONTROLLING INTERESTS Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Noncontrolling Interest [Line Items]        
Net Income (Loss) Attributable to Noncontrolling Interest $ 41us-gaap_NetIncomeLossAttributableToNoncontrollingInterest $ 17us-gaap_NetIncomeLossAttributableToNoncontrollingInterest    
Stockholders' Equity Attributable to Noncontrolling Interest, Ending 977us-gaap_MinorityInterest   931us-gaap_MinorityInterest  
Noncontrolling Interests [Member]        
Noncontrolling Interest [Line Items]        
Net Income (Loss) Attributable to Noncontrolling Interest 41us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
17us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 9us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
12us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Capital Contributions 14dow_MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
29dow_MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Purchases of noncontrolling interests 0us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
54us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Transfer of redeemable noncontrolling interest 0us-gaap_MinorityInterestChangeInRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(27)us-gaap_MinorityInterestChangeInRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Cumulative translation adjustment 0us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
2us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Other 0us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
1us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Stockholders' Equity Attributable to Noncontrolling Interest, Ending $ 977us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 982us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 931us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 1,026us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember