FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Potential Offset of Counterparty Netting and Cash Collateral) (Details) - Energy Derivative Contracts - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative Assets
Gross Amount Recognized in the Balance Sheets	$ 65	$ 104
Counterparty Netting of Energy Contracts	13	14
Cash collateral received/posted	0	14
Net Amount	52	76
Derivative Liabilities
Gross Amount Recognized in the Balance Sheets	(14)	(18)
Counterparty Netting of Energy Contracts	(13)	(14)
Cash collateral received/posted	0	0
Net Amount	$ (1)	$ (4)

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