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INVESTMENTS - Reconciliation of Summarized Financial Information to Carrying Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of joint ventures [line items]      
Beginning balance $ 11,067 $ 10,313  
Net (loss) income (1,435) 1,516  
Ending balance 9,385 11,067  
Carrying value 1,234 1,213  
Jabal Sayid      
Disclosure of joint ventures [line items]      
Beginning balance 166    
Net (loss) income 78 52  
Investments accounted for using equity method, dividend 0    
Ending balance 244 166  
Barrick's share of net assets (50%) 122    
Equity earnings adjustment 0    
Goodwill recognition 123    
Carrying value 245 206 $ 180
Loans receivable from related party $ 165    
Economic interest in joint venture 50.00%    
Zaldívar      
Disclosure of joint ventures [line items]      
Beginning balance $ 1,969    
Net (loss) income 28 122  
Investments accounted for using equity method, dividend 0    
Ending balance 1,997 1,969  
Barrick's share of net assets (50%) 999    
Equity earnings adjustment (10)    
Goodwill recognition 0    
Carrying value $ 989 $ 975 $ 974
Economic interest in joint venture 50.00%