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SEPARATION FROM DOWDUPONT Separation from DowDuPont (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 01, 2017
Aug. 31, 2017
Common Stock, Par or Stated Value Per Share   $ 0.01 $ 0.01      
Common Stock, Shares, Issued   751,228,644 100      
Transfer of Business Under Common Control   $ (1,935) $ 240 $ (6)    
Dow Inc. [Member]            
Common Stock, Par or Stated Value Per Share $ 0.01   $ 0.01      
Common Stock, Shares, Issued 748,771,240   100      
Proceeds from Contributions from Parent $ 2,024          
DowDuPont            
Common Stock, Par or Stated Value Per Share $ 0.01         $ 0.01
The Dow Chemical Company            
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01   $ 0.01 $ 2.50
Common Stock, Shares, Issued   100 100   100  
Transfer of Business Under Common Control   $ 61 $ 240 (6)    
Retained Earnings [Member]            
Transfer of Business Under Common Control   (14,806) (182) 5,693    
Retained Earnings [Member] | The Dow Chemical Company            
Transfer of Business Under Common Control   $ (16,009) $ (182) $ 5,693