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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

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