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DISPOSITIONS AND ACQUISITIONS (TF Holdings Limited) (Details) $ in Millions			12 Months Ended
	Dec. 21, 2018 USD ($)	Nov. 16, 2016 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 31, 2020 USD ($)	Nov. 30, 2016 USD ($) $ / lb	Nov. 15, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture, net	$ 350
Other assets			$ 1,560	$ 1,885
Net income (loss) from discontinued operations			$ 0	3	$ (15)
Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture, net		$ 2,650
Contingent receivable							$ 120
Chainge in fair value of contingent consideration				3	(17)
Net income (loss) from discontinued operations				$ 3	$ (15)
TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage								70.00%
Copper | Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent receivable							60
Cobalt | Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent receivable						$ 60	$ 60
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb							20
Maximum | Copper | Disposed of by Sale, Discontinued Operations | TF Holdings Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb							3.50

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