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INVESTMENTS - Reconciliation of Summarized Financial Information to Carrying Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of joint ventures [line items]      
Beginning balance $ 9,385 $ 11,131  
Net income (loss) 4,574 (1,435)  
Ending balance 29,827 9,385  
Carrying value 4,527 1,234  
Kibali [Member]      
Disclosure of joint ventures [line items]      
Beginning balance 0    
Acquisition 4,632    
Net income (loss) 194 0  
Investments accounted for using equity method, dividend (150)    
Ending balance 4,676 0  
Barrick's share of net assets 2,107    
Equity earnings adjustment 0    
Goodwill recognition 1,111    
Carrying value 3,218 0 $ 0
Jabal Sayid      
Disclosure of joint ventures [line items]      
Beginning balance 244    
Acquisition 0    
Net income (loss) 103 78  
Investments accounted for using equity method, dividend 0    
Ending balance 347 244  
Barrick's share of net assets 173    
Equity earnings adjustment 0    
Goodwill recognition 123    
Carrying value 296 245 206
Loans receivable from related party 75    
Zaldívar      
Disclosure of joint ventures [line items]      
Beginning balance 1,997    
Acquisition 0    
Net income (loss) 32 28  
Investments accounted for using equity method, dividend (100)    
Ending balance 1,929 1,997  
Barrick's share of net assets 965    
Equity earnings adjustment (10)    
Goodwill recognition 0    
Carrying value $ 955 $ 989 $ 975