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DISPOSITIONS AND ACQUISITIONS (Assets Held for Sale - Freeport Cobalt) (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 21, 2018
Assets |  |  |  |
Cash and cash equivalents | $ 2,020 | $ 3,657 |  |
Trade accounts receivable | 741 | 892 |  |
Property, plant, equipment and mine development costs, net | 29,584 | 29,818 |  |
Other assets | 1,885 | 1,560 |  |
Total previously included in current assets held for sale | 40,809 | 42,144 | $ 42,216 |
Liabilities |  |  |  |
Accounts payable and accrued liabilities | 2,576 | 2,708 |  |
Accrued income taxes | 119 | 324 |  |
Deferred income taxes and asset retirement obligations | 4,206 | 4,408 |  |
Total previously included in current liabilities held for sale | 23,361 | $ 23,476 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Freeport Cobalt |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Cash | 59 |  |  |
Disposal Group, Including Discontinued Operation, Assets | 271 |  |  |
Liabilities |  |  |  |
Disposal Group, Including Discontinued Operation, Liabilities | 63 |  |  |
Disposal Group, Including Discontinued Operation, Consideration | 200 |  |  |
Disposal Group, Including Discontinued Operation, Consideration, Working Capital | $ 50 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Lundin Mining Corporation [Member] | Freeport Cobalt |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Proceeds On Sale, Percent | 30.00% |  |  |
PT Freeport Indonesia [Member] |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Ownership percentage |  | 48.76% |  | 81.28%

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