FAIR VALUE MEASUREMENTS (Level 3 Reconciliation) (Details) - Level 3 - Price Risk Management Instruments - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset balance, Beginning of period	$ 191	$ 199
Included in regulatory assets and liabilities or balancing accounts	(64)	(8)
Asset balance, End of period	$ 127	$ 191