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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% |  |  |  |

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- Definition [Line Items] for Disclosure of joint arrangements and subsidiaries [Table] + References No definition available. + Details
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- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The statement that the lessee accounts for short-term leases using the recognition exemption in paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 60 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_60&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph C12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_C12_a&doctype=Appendix&seq=3 -URIDate 2018-03-16 + Details
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