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NEVADA GOLD MINES TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Due to (from) related party $ 63 $ 63  
Joint venture | NGM      
Related Party Transaction [Line Items]      
Amounts billed for transition services 3 6  
Purchases $ 538 $ 1,051  
Due to (from) related party     $ 120