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STOCKHOLDERS' EQUITY (Employee Stock Ownership Plan) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2009
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 02, 2009
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Debt of ESOP   $ 10 $ 17    
Dow ESOP          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
ESOP, compensation expense   $ 175 $ 248 $ 192  
Shares allocated to participants' accounts   15.3      
Employee Stock Ownership Plan (ESOP), Shares in ESOP   21.8      
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares   1.5      
Number of unearned shares   5.0      
Fair value of unearned shares   $ 267      
Rohm And Haas | Rohm and Haas ESOP          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Debt of ESOP         $ 78
Interest rate on debt of ESOP 9.80%