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DISPOSITIONS AND ACQUISITIONS (TF Holdings Limited) (Details)
$ in Millions
12 Months Ended
Nov. 16, 2016
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Nov. 30, 2016
USD ($)
$ / lb
Nov. 15, 2016
Disposed of by Sale, Discontinued Operations | TF Holdings Limited          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from divestiture, net $ 2,650        
Contingent receivable       $ 120  
Chainge in fair value of contingent consideration   $ 3      
TF Holdings Limited          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Ownership percentage         70.00%
Copper | Disposed of by Sale, Discontinued Operations | TF Holdings Limited          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Contingent receivable       60  
Cobalt | Disposed of by Sale, Discontinued Operations | TF Holdings Limited          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Contingent receivable     $ 60 $ 60  
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb       20  
Maximum | Copper | Disposed of by Sale, Discontinued Operations | TF Holdings Limited          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb       3.50