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SEPARATION FROM DOWDUPONT Separation from DowDuPont (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Common Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01   $ 0.01
Common Stock, Shares, Issued   753,924,753   753,924,753   751,228,644
Settlements and transfers related to separation from DowDuPont Inc.       $ 0 $ 1,963  
Integration and separation costs   $ 46   $ 111    
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          
Integration and separation costs     $ 348   800  
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   $ 46 324 111 776  
Retained Earnings [Member]            
Settlements and transfers related to separation from DowDuPont Inc.   0 14,846 0 14,811  
Retained Earnings [Member] | The Dow Chemical Company [Domain]            
Settlements and transfers related to separation from DowDuPont Inc.   $ 0 $ 16,025 $ 0 $ 15,990