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GENERAL AND ADMINISTRATIVE EXPENSES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Administrative Expense [Line Items]    
Administrative expenses $ 185 $ 212
Severance payments 1 18
Employee costs 128 131
Tanzanian Mines [Member]    
Disclosure of Administrative Expense [Line Items]    
Administrative expenses 0 27
Corporate administration    
Disclosure of Administrative Expense [Line Items]    
Administrative expenses 118 148
Expense (recovery) from share-based payment transactions with employees $ 67 $ 37