FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Potential Offset of Counterparty Netting and Cash Collateral) (Details) - Energy Derivative Contracts - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative Assets
Gross Amount Recognized in the Balance Sheets	$ 61	$ 35
Counterparty Netting of Energy Contracts	21	15
Cash collateral received/posted	0	0
Net Amount	40	20
Derivative Liabilities
Gross Amount Recognized in the Balance Sheets	(47)	(30)
Counterparty Netting of Energy Contracts	(21)	(15)
Cash collateral received/posted	0	0
Net Amount	$ (26)	$ (15)

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