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MERGER WITH DUPONT (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Sep. 01, 2017
Aug. 31, 2017
Planned Merger with DuPont [Line Items]          
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01    
Common stock issued (in shares)   100 100    
Treasury Stock          
Planned Merger with DuPont [Line Items]          
Stock Repurchased and Retired During Period, Value $ 935        
Common Stock          
Planned Merger with DuPont [Line Items]          
Stock Repurchased and Retired During Period, Value 3,107        
Additional Paid-in Capital          
Planned Merger with DuPont [Line Items]          
Stock Repurchased and Retired During Period, Value $ 2,172        
Dow          
Planned Merger with DuPont [Line Items]          
Common stock, par value (in dollars per share)         $ 2.50
Dow to DowDuPont Share Exchange Ratio for Common Shares         1
DowDuPont          
Planned Merger with DuPont [Line Items]          
Common stock, par value (in dollars per share)       $ 0.01 $ 0.01
Common stock issued (in shares)       100