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GOODWILL AND OTHER INTANGIBLE ASSETS (Schedule of Goodwill) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]      
Net goodwill, beginning balance   $ 13,938 $ 15,272
Dissolution of joint venture     48
Foreign currency impact   (80) 299
Other   (10) (5)
Net goodwill, ending balance $ 13,938 13,848 13,938
Disposal Group, Disposed of by Sale, Not Discontinued Operations | SKC Haas Display Films Group      
Goodwill [Roll Forward]      
Goodwill, Written off Related to Sale of Business Unit     (34)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Global Ethylene Acrylic Acid (EAA)      
Goodwill [Roll Forward]      
Goodwill, Written off Related to Sale of Business Unit     (23)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Dow AgroSciences' Corn Seed Business      
Goodwill [Roll Forward]      
Goodwill, Written off Related to Sale of Business Unit     (128)
Coatings and Performance Monomers      
Goodwill [Roll Forward]      
Net goodwill, beginning balance   $ 1,071  
Goodwill impairment (1,491)   (1,491)
Net goodwill, ending balance $ 1,071   $ 1,071