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SIGNIFICANT ACCOUNTING POLICIES - Joint Arrangements and Entities Other Than 100% Owned Barrick Subsidiaries (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Sep. 16, 2019
Dec. 31, 2020
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           100.00%
Proportion of ownership interests held by non-controlling interests 16.00%          
Joint ventures            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Contractual obligation           $ 653
Turquoise Ridge            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint venture     75.00%      
Kibali [Member]            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint venture           45.00%
Jabal Sayid            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint venture           50.00%
Zaldívar            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint venture           50.00%
Tanzanian Mines [Member]            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary   100.00%     63.90% 84.00%
Norte Abierto Project            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint operation           50.00%
Donlin Gold Project            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint operation           50.00%
Porgera Mine            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint operation           47.50%
Turquoise Ridge            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint operation     75.00%      
Veladero            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint operation           50.00%
Nevada Gold Mines            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           61.50%
Proportion of ownership interests held by non-controlling interests           38.50%
North Mara [Member]            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           84.00%
Proportion of ownership interests held by non-controlling interests           16.00%
Bulyanhulu [Member]            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           84.00%
Proportion of ownership interests held by non-controlling interests           16.00%
Buzwagi [Member]            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           84.00%
Proportion of ownership interests held by non-controlling interests           16.00%
Carlin            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary       61.50%    
Proportion of ownership interests held by non-controlling interests           38.50%
Cortez            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary       61.50%    
Proportion of ownership interests held by non-controlling interests           38.50%
Turquoise Ridge            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           61.50%
Proportion of ownership interests held by non-controlling interests           38.50%
Phoenix            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interests held by non-controlling interests           38.50%
Long Canyon            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interests held by non-controlling interests           38.50%
Loulo Gounkoto            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           80.00%
Proportion of ownership interests held by non-controlling interests           20.00%
Tongon            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           89.70%
Proportion of ownership interests held by non-controlling interests           10.30%
Pueblo Viejo            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           60.00%
Proportion of ownership interests held by non-controlling interests           40.00%
South Arturo            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary     60.00% 36.90%    
Phoenix and Long Canyon [Member]            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interest in subsidiary           61.50%
Newmont [Member] | Turquoise Ridge            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Economic interest in joint venture     25.00%      
Government of Tanzania            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interests held by non-controlling interests           16.00%
Government of Tanzania | Tanzanian Mines [Member]            
Disclosure of Joint Arrangements and Subsidiaries [Line Items]            
Proportion of ownership interests held by non-controlling interests           16.00%