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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments |  |  | $ 1,365 | $ 1,410
Nuclear decommissioning trusts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | $ 586 | $ 366 | 1,365 | 1,410
Gross realized gains on securities | 124 | 40 | 130 | 151
Gross realized losses on securities | (4) | (11) | (21) | (41)
Customer credit trust |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 114 | 117 | 310 | 291
Gross realized gains on securities | 7 | 0 | 12 | 8
Gross realized losses on securities | $ (3) | $ 0 | $ (14) | $ (2)

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