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SEPARATION FROM DOWDUPONT Separation from DowDuPont (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Apr. 01, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Common Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01
Common Stock, Shares, Issued   753,534,116   751,228,644
Settlements and transfers related to separation from DowDuPont Inc.   $ 0 $ 36  
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
Common Stock, Shares, Issued   100   100
Settlements and transfers related to separation from DowDuPont Inc.   $ 0 (36)  
Retained Earnings [Member]        
Settlements and transfers related to separation from DowDuPont Inc.   0 35 $ 14,806
Retained Earnings [Member] | The Dow Chemical Company [Domain]        
Settlements and transfers related to separation from DowDuPont Inc.   $ 0 $ 35 $ 16,009