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DERIVATIVE INSTRUMENTS Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative [Line Items]
Interest Rate Derivatives, at Fair Value, Net	$ 7
Energy Hedges [Member]
Derivative [Line Items]
Proceeds from Hedge, Investing Activities	8	$ 18
Payments for (Proceeds from) Hedge, Investing Activities	2	$ 0
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	200
Fair Value, Inputs, Level 2 [Member] \| Energy Hedges [Member]
Derivative [Line Items]
Derivative Liability	3		$ 0
Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability	7		$ 10
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Energy Hedges [Member]
Derivative [Line Items]
Derivative Asset	$ 0