DISPOSITIONS AND ACQUISITIONS (Timok) (Details) - USD ($) $ in Millions				1 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Jul. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	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 sales of assets					$ 247	$ 704	$ 561
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			150
Divestiture of Businesses, Deferred Payments Receivable, Demand Amount				$ 60			$ 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 of assets		$ 50	$ 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 | 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 of assets	$ 12