DERIVATIVES AND HEDGING ACTIVITIES Schedule of Notional Amounts of Financial Instruments (Details) € in Millions, R$ in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) MWh	Dec. 31, 2020 USD ($) MWh	Jun. 30, 2021 EUR (€)	Jun. 30, 2021 BRL (R$)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 BRL (R$)
Cash Flow Hedging | Foreign Exchange Contract | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	$ 88	$ 85	€ 195		€ 187
Net Investment Hedging [Member] | Foreign Exchange Contract | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount			670	R$ 600	0	R$ 0
Foreign Exchange | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	$ 600	$ 0	€ 500		€ 0
Energy Commodities and Service | Energy Related Derivative | Not Designated as Hedging Instrument
Derivative [Line Items]
Underlying, Derivative Energy Measure	100,000	200,000