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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 02, 2009
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Debt of ESOP   $ 24 $ 30    
Dow ESOP [Member]          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
ESOP, compensation expense   $ 192 $ 174 $ 163  
Shares allocated to participants' accounts   15.8      
Employee Stock Ownership Plan (ESOP), Shares in ESOP   29.3      
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares   1.9      
Number of unearned shares   11.6      
Fair value of unearned shares   $ 661      
Rohm And Haas [Member] | Rohm and Haas ESOP [Member]          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Debt of ESOP         $ 78
Interest rate on debt of ESOP 9.80%