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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS (Annual Goodwill Impairment Test) (Details)
Dec. 31, 2014
ReportingUnits
Dec. 31, 2013
ReportingUnits
Dec. 31, 2012
ReportingUnits
Goodwill [Line Items]      
Number of Reporting Units Carrying Goodwill 14dow_NumberOfReportingUnitsCarryingGoodwill 19dow_NumberOfReportingUnitsCarryingGoodwill 20dow_NumberOfReportingUnitsCarryingGoodwill
Qualitative Goodwill Testing Approach [Member]      
Goodwill [Line Items]      
Number of Reporting Units Carrying Goodwill 9dow_NumberOfReportingUnitsCarryingGoodwill
/ dow_GoodwillImpairmentTestingAxis
= dow_QualitativeGoodwillTestingApproachMember
14dow_NumberOfReportingUnitsCarryingGoodwill
/ dow_GoodwillImpairmentTestingAxis
= dow_QualitativeGoodwillTestingApproachMember
11dow_NumberOfReportingUnitsCarryingGoodwill
/ dow_GoodwillImpairmentTestingAxis
= dow_QualitativeGoodwillTestingApproachMember
Quantitative Goodwill Testing Approach [Member]      
Goodwill [Line Items]      
Number of Reporting Units Carrying Goodwill 5dow_NumberOfReportingUnitsCarryingGoodwill
/ dow_GoodwillImpairmentTestingAxis
= dow_QuantitativeGoodwillTestingApproachMember
5dow_NumberOfReportingUnitsCarryingGoodwill
/ dow_GoodwillImpairmentTestingAxis
= dow_QuantitativeGoodwillTestingApproachMember
9dow_NumberOfReportingUnitsCarryingGoodwill
/ dow_GoodwillImpairmentTestingAxis
= dow_QuantitativeGoodwillTestingApproachMember