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DISPOSITIONS AND ACQUISITIONS (TF Holdings Limited) (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2018 USD ($) | Nov. 16, 2016 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 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 |  |  | $ 1,885 |  |  |  | $ 2,172 |  |  |  | $ 1,885 | $ 2,172 |  |  |  |
Net (loss) gain on disposal |  |  |  |  |  |  |  |  |  |  | 3 | (15) | $ 57 |  |  |
Net income (loss) from discontinued operations |  |  | $ 1 | $ 1 | $ 0 | $ 1 | 4 | $ (4) | $ (4) | $ (11) | 3 | (15) | 66 |  |  |
Disposed of by Sale, Discontinued Operations | TF Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 13 |  |  |
Proceeds from divestiture, net |  | $ 2,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120 |
Other assets |  |  |  |  |  |  | $ 57 |  |  |  |  | 57 |  |  |  |
Chainge in fair value of contingent consideration |  |  |  |  |  |  |  |  |  |  | 3 | (17) | 61 |  |  |
Net (loss) gain on disposal |  |  |  |  |  |  |  |  |  |  | 3 | (15) | 57 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  | 3 | (15) | 70 |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 4 |  |  |
Net income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 3 | (15) | 66 |  |  |
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 |
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Subsequent Event [Member] | 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 |  |
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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