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COMMITMENTS AND CONTINGENCIES (Dow v Nova & Luxi) (Details)
$ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Jul. 06, 2017
USD ($)
Jun. 29, 2017
USD ($)
Jun. 29, 2017
CAD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
CAD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]                              
Gain (loss) related to litigation settlement                         $ 54 $ 544 $ 205
Packaging & Specialty Plastics [Member]                              
Loss Contingencies [Line Items]                              
Gain (loss) related to litigation settlement                         0 544 $ 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 Litigation Liability, Current           $ 341             341 341  
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                   $ 1,080 $ 1,430        
Proceeds from settlements $ 259             $ 800 $ 1,080            
Gain (loss) related to litigation settlement           552 $ 18     186          
Litigation settlement, Amount Awarded from Other Party - Withholding Tax                 $ 347            
Estimated liability           323             $ 323 $ 323  
Dow V. Nova Chemicals Corporation Ethylene Asset Matter [Member] [Member] | Sundry Income (Expense), Net                              
Loss Contingencies [Line Items]                              
Gain (loss) related to litigation settlement           538 6     170          
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           $ 14 $ 12     $ 16          
Luxi Chemical Group Breach of Contract Matter | Sundry Income (Expense), Net                              
Loss Contingencies [Line Items]                              
Gain (loss) related to litigation settlement         $ 54