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ASSET RETIREMENT OBLIGATIONS - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 04, 2025 | Dec. 31, 2024 | Feb. 03, 2025
Segment Reporting Information [Line Items] |  |  |
Changes in timing and amount of estimated cash flows |  | $ 131 |
Asset retirement obligation, derecognized amount | $ 15 |  |
JERSEY CENTRAL POWER & LIGHT COMPANY |  |  |
Segment Reporting Information [Line Items] |  |  |
Changes in timing and amount of estimated cash flows |  | 0 |
Environmental Liability |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset retirement obligation, escrow deposit | $ 130 | 160 | $ 160
Asset retirement obligation, discount rate | 4.80% |  |
Environmental Liability | Weighted Average |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset retirement obligation, discount rate | 4.80% |  |
Regulation of Waste Disposal |  |  |
Segment Reporting Information [Line Items] |  |  |
Changes in timing and amount of estimated cash flows |  | 139 |
Regulation of Waste Disposal | JERSEY CENTRAL POWER & LIGHT COMPANY |  |  |
Segment Reporting Information [Line Items] |  |  |
Changes in timing and amount of estimated cash flows |  | 0 |
Corporate Non Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Changes in timing and amount of estimated cash flows |  | $ 87 |

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- Definition Amount of increase (decrease) in asset retirement obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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