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DISPOSITIONS AND ACQUISITIONS (Freeport Cobalt) (Details) - Freeport Cobalt - Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	$ 271
Disposal Group, Including Discontinued Operation, Liabilities	63
Disposal Group, Including Discontinued Operation, Consideration	200
Disposal Group, Including Discontinued Operation, Cash	$ 59
Lundin Mining Corporation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Proceeds On Sale, Percent	30.00%

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