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DISPOSITIONS AND ACQUISITIONS (Timok) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Jul. 31, 2020
Dec. 21, 2018
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Nov. 01, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture, net       $ 350        
Proceeds from sales           $ 0    
Disposed of by Sale, Discontinued Operations | Timok, Lower Zone [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture, net         $ 240      
Divestiture of Businesses, Deferred Payments Receivable             $ 150  
Divestiture of Businesses, Deferred Payments Receivable, Demand Amount             60  
Disposed of by Sale, Discontinued Operations | Timok, Upper Zone [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Divestiture of Businesses, Contingent Consideration               $ 107
Proceeds from sales     $ 45          
Disposed of by Sale, Discontinued Operations | Timok                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture, net           240    
Divestiture of Businesses, Contingent Consideration         $ 103 $ 103    
Gain (Loss) on Disposition of Business             $ 343  
Forecast [Member] | Disposed of by Sale, Discontinued Operations | Timok, Upper Zone [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from sales $ 12 $ 50