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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments |  |  | $ 779 | $ 1,044
Nuclear decommissioning trusts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | $ 501 | $ 587 | 779 | 1,044
Gross realized gains on securities | 4 | 70 | 6 | 111
Gross realized losses on securities | (11) | (19) | (17) | (30)
Customer credit trust |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 97 | 93 | 196 | 174
Gross realized gains on securities | 2 | 0 | 5 | 8
Gross realized losses on securities | $ (8) | $ (1) | $ (11) | $ (2)

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