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FAIR VALUE MEASUREMENTS (Schedule of Activity for Debt and Equity Securities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | $ 1,980.0 | $ 2,235.0 | $ 3,316.0
Nuclear decommissioning trusts |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 1,980.0 | 2,235.0 | 3,316.0
Gross realized gains on securities | 255.0 | 80.0 | 2.0
Gross realized losses on securities | (63.0) | (74.0) | (3.0)
Customer credit trust |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from sales and maturities of nuclear decommissioning trust investments | 398.0 | 556.0 | 250.0
Gross realized gains on securities | 10.0 | 23.0 | 10.0
Gross realized losses on securities | (8.0) | (19.0) | $ (41.0)
Impairment write down | $ 0.0 | $ 4.0 |

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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