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SIGNIFICANT ACCOUNTING POLICIES - Lease Obligations and Right-of-Use Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Barrick operating lease commitments disclosed as at December 31, 2018     $ 167
Add: embedded service contracts not previously assessed as a lease $ 38 $ 97  
(Less): contracts reassessed as service agreements (130)    
(Less): short-term leases recognized on a straight-line basis as expense (6) 56  
(Less): low-value leases recognized on a straight-line basis as expense (1)    
(Less): discounting using the lessee’s incremental borrowing rate of at January 1, 2019 (4)    
Discounted leases recognized as at January 1, 2019 64    
Finance lease liabilities 111   19
Current lease liabilities 37    
Non-current lease liabilities 74    
Right-of-use assets 85 75  
Additions to right-of-use assets   49  
Increase (decrease) in deferred tax liability (asset)   (1,879) $ (801)
Randgold      
Disclosure of quantitative information about right-of-use assets [line items]      
Finance lease liabilities 28    
Land and buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 69 63  
Machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 7 7  
Vehicles      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 9 5  
IFRS 16      
Disclosure of quantitative information about right-of-use assets [line items]      
Additions to right-of-use assets 85    
Increase (decrease) in deferred tax liability (asset) 0    
Increase in finance lease liability 92    
Change in deficit $ 0    
Change in net income   $ 3