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ACQUISITIONS AND DIVESTITURES - Narrative (Details) |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Jan. 24, 2020 Rate | Jan. 01, 2020 Rate | Dec. 10, 2019 USD ($) Rate shares | Nov. 28, 2019 USD ($) Rate | Sep. 17, 2019 Rate shares | Mar. 10, 2019 Rate | Sep. 24, 2018 USD ($) | Dec. 31, 2019 USD ($) Rate | Sep. 30, 2019 USD ($) $ / bbl | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) Rate | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Rate | Sep. 16, 2019 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 18, 2019 USD ($) | Jan. 01, 2019 USD ($) shares Rate | Oct. 02, 2018 shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments for fair value losses (gains) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,886,000,000) | $ 0 |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |
Shandong Gold [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of equity interests acquired (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000,000
Massawa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold | Rate |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  | $ 430,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (380,000,000) |  |  |  |
Proportion of consideration | Rate |  |  | 92.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan issued for part financing |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates | shares |  |  | 19,164,403 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Massawa [Member] | Teranga Gold Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instruments issued |  |  | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of interest held by shareholders | Rate |  |  | 11.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of interest held by shareholders | Rate |  |  | 11.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Massawa [Member] | Cash and equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration received |  |  | $ (300,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Massawa [Member] | Contingent payment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration received |  |  | $ (50,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KCGM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold | Rate |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on transaction |  |  |  | $ 408,000,000 |  |  |  |  |  |  |  |  |  |  | $ 408,000,000 |  |  |  |
Barrick Nevada Mines [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | Rate |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest sold | Rate | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of interest held by shareholders | Rate |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through change in equity of subsidiaries, equity |  |  |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |
Share for share exchange | shares |  |  |  |  | 0.168 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  | 24,836,670 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  | 36.10% |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |
Proportion of ownership interest in subsidiary |  | 84.00% |  |  | 100.00% |  |  | 100.00% |  |  |  |  | 63.90% | 63.90% |  |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) |  |  |  |  |  |  |  |  |  |  |  | 1,200 |  |  |  |  |  |  |
Proportion of interest held by shareholders | Rate |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Turquoise Ridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.50% |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61.50% |  |  |  |
Nevada Gold Mines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through change in equity of subsidiaries, equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,555,000,000 |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61.50% |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / bbl |  |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |  |  |  |  |
Randgold [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,000,000 |  |  |  |
Barrick Gold Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of interest held by shareholders | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66.70% |
Proportion of interest held by shareholders | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66.70% |
Newmont [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  |  |  | $ 3,897,000,000 |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | Rate |  |  |  |  |  | 61.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests | Rate |  |  |  |  |  | 38.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest in acquiree recognised at acquisition date |  |  |  |  |  |  |  |  | $ 1,645,000,000 |  | $ 2,440,000,000 |  | $ 1,645,000,000 |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  |  |  | $ 1,184,000,000 |  |  |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,745,000,000 |  |  |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000,000 |  |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  |  |  |  |  |  | 322,000,000 |  |  |  |  |  |  |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |
Randgold Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,909,000,000 |
Percentage of voting equity interests acquired | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Share for share exchange | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.1280 |
Non-controlling interest in acquiree recognised at acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 872,000,000 |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,390,000,000 |  |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 241,000,000 |  |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,000,000 |  |  |  |
Number of instruments or interests issued or issuable | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 583,669,178 |
Fair value of acquired receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 193,000,000 |
Tax claims related to foreign operations |  |  |  |  |  |  |  | $ 275,000,000 |  | 275,000,000 |  |  |  |  | 275,000,000 |  |  | $ 267.7 |
Taxes recoverable |  |  |  |  |  |  |  | 60,000,000 |  | 60,000,000 |  |  |  |  | 60,000,000 |  |  |  |
Randgold Corporation [Member] | Randgold Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of interest held by shareholders | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.30% |
Proportion of interest held by shareholders | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.30% |
Turquoise Ridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture | Rate |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |
MALI | Randgold [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax claims related to foreign operations |  |  |  |  |  |  |  | $ 92,000,000 |  | $ 92,000,000 | $ 275,000,000 |  |  |  | $ 92,000,000 |  |  | $ 267,700,000 |
Taxes recoverable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,000,000 | 41,100,000 |
Fair value of taxes recoverable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 |

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