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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%

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