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COMMITMENTS AND CONTINGENCIES (Environmental Matters) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]            
Accrual adjustment       $ 184 $ 159  
Payments against reserve       (204) (162)  
Foreign currency impact       (8) (21)  
Capital expenditures for environmental protection       137 65 $ 80
Restructuring and asset related charges - net       $ 118 $ 6 $ 708
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]       Cost of sales Cost of sales Cost of sales
Performance Materials & Coatings [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net       $ 6 $ 10 $ 192
Corporate Segment [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net       31 13 464
2020 Restructuring Program [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   $ 573 $ 575      
2020 Restructuring Program [Member] | Performance Materials & Coatings [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   177        
2020 Restructuring Program [Member] | Corporate Segment [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   363        
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   80 81      
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Performance Materials & Coatings [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   61        
Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Corporate Segment [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   19        
Environmental Remediation [Member] | Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   56        
Environmental Remediation [Member] | Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Performance Materials & Coatings [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   52        
Environmental Remediation [Member] | Costs Associated with Exit and Disposal Activities [Member] | 2020 Restructuring Program [Member] | Corporate Segment [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Restructuring and asset related charges - net   4        
Tittabawassee and Saginaw Rivers, Saginaw Bay [Member]            
Site Contingency [Line Items]            
Accrued obligations for environmental matters         77  
Accrual for Environmental Loss Contingencies [Roll Forward]            
Balance at Jan 1       77    
Balance at Dec 31         77  
Payments for Legal Settlements $ 15          
Tittabawassee and Saginaw Rivers, Saginaw Bay - Local Projects [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Payments for Legal Settlements 7          
Other Environmental Matters            
Site Contingency [Line Items]            
Accrued obligations for environmental matters       1,192 1,220  
Accrual for Environmental Loss Contingencies [Roll Forward]            
Balance at Jan 1       1,220    
Balance at Dec 31       1,192 1,220  
Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag $ 1,244 $ 1,244   1,192 1,220 $ 1,244
Other Environmental Matters | Superfund Sites            
Site Contingency [Line Items]            
Accrued obligations for environmental matters       244 237  
Accrual for Environmental Loss Contingencies [Roll Forward]            
Balance at Jan 1       237    
Balance at Dec 31       244 237  
Other Environmental Matters, Off-Site Matters            
Site Contingency [Line Items]            
Accrued obligations for environmental matters       92 104  
Accrual for Environmental Loss Contingencies [Roll Forward]            
Balance at Jan 1       104    
Balance at Dec 31       92 104  
Dow Silicones Corporation            
Site Contingency [Line Items]            
Indemnification asset       $ 98 $ 95  
Dow Silicones Corporation | Environmental Issue [Member]            
Site Contingency [Line Items]            
Indemnification asset     $ 50