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DISPOSITIONS AND ACQUISITIONS (Timok) (Details) - USD ($) $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Jul. 31, 2020 | Dec. 21, 2018 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 01, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture, net |  |  |  | $ 350 |  |  |  |
Proceeds from sales |  |  |  |  |  | $ 0 |  |
Disposed of by Sale, Discontinued Operations | Timok, Lower Zone [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture, net |  |  |  |  | $ 240 |  |  |
Divestiture of Businesses, Deferred Payments Receivable |  |  |  |  |  |  | $ 150 |
Divestiture of Businesses, Deferred Payments Receivable, Demand Amount |  |  |  |  |  |  | 60 |
Disposed of by Sale, Discontinued Operations | Timok, Upper Zone [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Divestiture of Businesses, Contingent Consideration |  |  |  |  |  |  |  | $ 107
Proceeds from sales |  |  | $ 45 |  |  |  |  |
Disposed of by Sale, Discontinued Operations | Timok |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture, net |  |  |  |  |  | 240 |  |
Divestiture of Businesses, Contingent Consideration |  |  |  |  | $ 103 | $ 103 |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  | $ 343 |
Forecast [Member] | Disposed of by Sale, Discontinued Operations | Timok, Upper Zone [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sales | $ 12 | $ 50 |  |  |  |  |  |

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