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ASSET RETIREMENT OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Changes to the ARO Balances | The following table summarizes the changes to the ARO balances as of March 31, 2025, and December 31, 2024
|  | FirstEnergy |  | JCP&L
|  | (In millions)
Balance, January 1, 2024 |  | $ | 209 |  |  | $ | 7 |
Changes in timing and amount of estimated cash flows |  | 131 |  |  | — |
Liabilities incurred |  | 95 |  |  | — |
Liabilities settled |  | (4) |  |  | — |
Accretion |  | 24 |  |  | 1 |
Balance, December 31, 2024 |  | 455 |  |  | 8 |
Liabilities settled (1) |  | (151) |  |  | — |
Accretion |  | 7 |  |  | — |
Balance, March 31, 2025 |  | $ | 311 |  |  | $ | 8 |
(1) FirstEnergy amounts include the transfer of the McElroy’s Run CCR impoundment facility as well as the adjacent dry landfill and related remediation obligations to subsidiary of IDA Power, LLC.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + 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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