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OPERATING SEGMENTS AND GEOGRAPHIC AREAS (Schedule of Revenue by Geographic Area) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sales by operating segment [Line Items]    
Net Sales $ 12,370us-gaap_SalesRevenueNet $ 14,461us-gaap_SalesRevenueNet
United States [Member]    
Sales by operating segment [Line Items]    
Net Sales 4,327us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 4,791us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
Europe, Middle East, Africa and India [Domain]    
Sales by operating segment [Line Items]    
Net Sales 3,974us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= dow_EuropeMiddleEastAfricaandIndiaDomain		 5,215us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= dow_EuropeMiddleEastAfricaandIndiaDomain
Rest of World [Domain]    
Sales by operating segment [Line Items]    
Net Sales $ 4,069us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= dow_RestofWorldDomain		 $ 4,455us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= dow_RestofWorldDomain