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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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01      
Common Stock, Shares, Issued   764,226,882 755,993,198 764,226,882 755,993,198    
Transfer of Business Under Common Control       $ 0 $ 0 $ 1,935  
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            
The Dow Chemical Company              
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01   $ 0.01      
Common Stock, Shares, Issued   100   100      
Transfer of Business Under Common Control       $ 0 0 61  
DowDuPont              
Common Stock, Par or Stated Value Per Share $ 0.01            
Retained Earnings [Member]              
Transfer of Business Under Common Control   $ 46 $ 177 46 177 (14,806)  
Retained Earnings [Member] | The Dow Chemical Company              
Transfer of Business Under Common Control       $ 0 $ 0 $ (16,009)