FAIR VALUE MEASUREMENTS (Level 3 Reconciliation) (Details) - Level 3 - Price Risk Management Instruments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset balance, Beginning of period	$ 126	$ 126	$ 199	$ 199
Included in regulatory assets and liabilities or balancing accounts	5	12	(68)	(61)
Asset balance, End of period	$ 131	$ 138	$ 131	$ 138