FAIR VALUE MEASUREMENTS (Level 3 Reconciliation) (Details) - Level 3 - Price Risk Management Instruments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset balance, Beginning of period	$ 145	$ 212	$ 191	$ 199
Included in regulatory assets and liabilities or balancing accounts	13	(86)	(33)	(73)
Asset balance, End of period	$ 158	$ 126	$ 158	$ 126