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ASSETS IMPAIRMENTS AND RESTRUCTURING (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Impairment of Long-Lived Assets to be Disposed of $ 7 $ 0  
Impairment of Intangible Assets, Finite-lived 2 0  
Severance Costs 5 28  
Business Exit Costs 0 4  
Total 14 32  
Restructuring Charge [Roll Forward]      
Balance at Beginning of Period 28 14 $ 14
Provision / Adjustments 14   126
Restructuring Reserve, Accrual Adjustment (9)    
Non-cash Reductions     (71)
Cash Reductions (6)   (41)
Balance at End of Period 27   28
Asset impairment charges 9 0  
Facility Closing [Member]      
Restructuring Charge [Roll Forward]      
Balance at Beginning of Period 11 8 8
Provision / Adjustments 0   9
Restructuring Reserve, Accrual Adjustment 0   1
Cash Reductions (1)   (7)
Balance at End of Period 10   11
Employee Severance [Member]      
Restructuring Charge [Roll Forward]      
Balance at Beginning of Period 17 6 6
Provision / Adjustments 5   45
Restructuring Reserve, Accrual Adjustment 0   0
Cash Reductions (5)   (34)
Balance at End of Period 17   17
Non-Cash Charges [Member]      
Restructuring Charge [Roll Forward]      
Balance at Beginning of Period 0 0 0
Provision / Adjustments 9   72
Non-cash Reductions (9)   (72)
Cash Reductions 0   0
Balance at End of Period 0   $ 0
Additives And Functional Products [Member]      
Restructuring Cost and Reserve [Line Items]      
Impairment of Intangible Assets, Finite-lived 2    
Corporate Cost Actions 2019 [Member] | Corporate, Non-Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs   28  
Capital Project AFP [Member] | Additives And Functional Products [Member]      
Restructuring Cost and Reserve [Line Items]      
Business Exit Costs   $ 4  
Site Closure North America 2020 [Member] | Advanced Materials [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs 3    
Restructuring Charge [Roll Forward]      
Asset impairment charges 4    
Site Closure Asia Pacific [Member] | Additives And Functional Products [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs 1    
Restructuring Charge [Roll Forward]      
Asset impairment charges 3    
Site Closure Singapore 2019 [Member] | Chemical Intermediates [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs $ 1