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SIGNIFICANT JUDGMENTS, ESTIMATES, ASSUMPTIONS AND RISKS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Disclosure of Detailed Information About Accounting Judgments and Estimates [Line Items] |  |  |  |  |  |  |  |
Cash flows from (used in) operating activities | $ 639 | $ 1,031 | $ 1,941 | $ 1,920 |  |  |  |
Cash and cash equivalents | 5,138 | $ 3,743 | 5,138 | $ 3,743 | $ 5,672 | $ 5,188 | $ 3,327 | $ 3,314
Credit Facility Due 2026 [Member] |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Accounting Judgments and Estimates [Line Items] |  |  |  |  |  |  |  |
Undrawn borrowing facilities | 3,000 |  | 3,000 |  |  |  |  |
Pascua-Lama | Chile |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Accounting Judgments and Estimates [Line Items] |  |  |  |  |  |  |  |
Receipts from value added tax refunds | 457 |  | 457 |  |  | 459 |  |
Revenue, performance obligation | 3,538 |  | 3,538 |  |  |  |  |
Pascua-Lama | Argentina |  |  |  |  |  |  |  |
Disclosure of Detailed Information About Accounting Judgments and Estimates [Line Items] |  |  |  |  |  |  |  |
Value added tax receivables | $ 48 |  | $ 48 |  |  | $ 53 |  |

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