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DISPOSITIONS AND ACQUISITIONS (Timok) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Jul. 31, 2020
Dec. 21, 2018
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    
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
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  
Gain (Loss) on Disposition of Business         $ 343  
Forecast [Member] | Subsequent Event [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 $ 45