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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | $ 2,235.0 | $ 3,316.0 | $ 1,678.0
Nuclear decommissioning trusts |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 2,235.0 | 3,316.0 | 1,678.0
Gross realized gains on securities | 80.0 | 2.0 | 286.0
Gross realized losses on securities | (74.0) | (3.0) | $ (19.0)
Customer credit trust |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 556.0 | 250.0 |
Gross realized gains on securities | 23.0 | 10.0 |
Gross realized losses on securities | (19.0) | (41.0) |
Impairment write down | $ 4.0 | $ 6.0 |

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