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COMMITMENTS AND CONTINGENT LIABILITIES (Dow v Nova)
$ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Jul. 06, 2017
USD ($)
Jun. 29, 2017
USD ($)
Jun. 29, 2017
CAD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
CAD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]                          
Gain (loss) related to litigation settlement                       $ 544 $ 205
Breast Implant and Other Products Liability Claims | Dow Silicones Corporation                          
Loss Contingencies [Line Items]                          
Product liability         $ 160   $ 165         160 165
Accrued and Other Current Liabilities [Member] | Breast Implant and Other Products Liability Claims | Dow Silicones Corporation                          
Loss Contingencies [Line Items]                          
Product liability         46   20         46 20
Other Noncurrent Obligations | Breast Implant and Other Products Liability Claims | Dow Silicones Corporation                          
Loss Contingencies [Line Items]                          
Product liability         114   145         114 145
Packaging & Specialty Plastics [Member]                          
Loss Contingencies [Line Items]                          
Gain (loss) related to litigation settlement                       544 170
Dow V. Nova Chemicals Corporation Patent Infringement Matter                          
Loss Contingencies [Line Items]                          
Settlement amount     $ 495 $ 645                  
Proceeds from settlements   $ 501                      
Dow V. Nova Chemicals Corporation Patent Infringement Matter | Accrued and Other Current Liabilities [Member]                          
Loss Contingencies [Line Items]                          
Estimated liability         341   0         341 0
Dow V. Nova Chemicals Corporation Patent Infringement Matter | Other Noncurrent Obligations                          
Loss Contingencies [Line Items]                          
Estimated liability         0   341         0 341
Dow V. Nova Chemicals Corporation Patent Infringement Matter | Packaging & Specialty Plastics [Member]                          
Loss Contingencies [Line Items]                          
Gain (loss) related to litigation settlement                     $ 160    
Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member]                          
Loss Contingencies [Line Items]                          
Settlement amount $ 259               $ 1,080 $ 1,430      
Proceeds from settlements             800 $ 1,080          
Gain (loss) related to litigation settlement         552 $ 18     186        
Estimated liability         323   $ 893         $ 323 $ 893
Litigation settlement, Amount Awarded from Other Party - Withholding Tax               $ 347          
Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member] | Selling, General and Administrative Expenses                          
Loss Contingencies [Line Items]                          
Gain (loss) related to litigation settlement         538 12     16        
Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member] | Sundry Income (Expense), Net                          
Loss Contingencies [Line Items]                          
Gain (loss) related to litigation settlement         $ 14 $ 6     $ 170