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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
Sep. 17, 2019
Dec. 31, 2019
Dec. 31, 2019
Jun. 30, 2019
Sep. 30, 2019
Sep. 16, 2019
Dec. 31, 2019
Jan. 01, 2019
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Statement that lessee accounts for short-term leases using recognition exemption               Payments associated with short-term leases and leases of low-value assets are recognized on a straight-line basis as an expense in profit or loss. Short-term leases are leases with a lease term of 12 months or less. Low-value assets are generally comprised of IT equipment and small items of office furniture.  
Proportion of ownership interests held by non-controlling interests 16.00%                
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16                 5.83%
Joint ventures                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Contractual obligation     $ 324 $ 324       $ 324  
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%  
Morila [Member]                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Economic interest in joint venture               40.00%  
GNX [Member]                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Economic interest in joint venture               50.00%  
Jabal Sayid                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Economic interest in joint venture               50.00%  
Kabanga                  
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%  
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 venture         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               39.00%  
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%  
Acacia Mining PLC                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Proportion of ownership interest in subsidiary 84.00% 100.00% 100.00%     63.90% 63.90%    
Proportion of ownership interests held by non-controlling interests   36.10%           0.00%  
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       36.90% 60.00%        
Phoenix and Long Canyon [Member]                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Proportion of ownership interest in subsidiary               61.50%  
Subsequent Event | Acacia Mining PLC                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Proportion of ownership interest in subsidiary 84.00%                
Newmont [Member] | Turquoise Ridge                  
Disclosure of Joint Arrangements and Subsidiaries [Line Items]                  
Economic interest in joint venture         25.00%