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SEPARATION FROM DOWDUPONT Separation from DowDuPont (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Common Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01   $ 0.01
Common Stock, Shares, Issued   754,555,065   754,555,065   751,228,644
Settlements and transfers related to separation from DowDuPont Inc.       $ 0 $ 1,935  
Integration and separation costs   $ 63 $ 164 $ 174 964  
Dow Inc. [Member]            
Common Stock, Par or Stated Value Per Share $ 0.01          
Common Stock, Shares, Issued 748,800,000          
Proceeds from Contributions from Parent $ 2,024          
DowDuPont [Member]            
Common Stock, Par or Stated Value Per Share $ 0.01          
The Dow Chemical Company [Domain]            
Common Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01   $ 0.01
Common Stock, Shares, Issued   100   100   100
Settlements and transfers related to separation from DowDuPont Inc.       $ 0 61  
Integration and separation costs   $ 63 164 174 940  
Retained Earnings [Member]            
Settlements and transfers related to separation from DowDuPont Inc.   0 50 0 14,861  
Retained Earnings [Member] | The Dow Chemical Company [Domain]            
Settlements and transfers related to separation from DowDuPont Inc.   $ 0 $ 32 $ 0 $ 16,022