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PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Tables) | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Benefit Costs | The components of FirstEnergy’s net periodic benefit costs (credits) for pension and OPEB were as follows:
Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Three Months Ended March 31, |  | 2024 |  | 2023 |  | 2024 |  | 2023
|  | (In millions)
Service costs |  | $ | 35 |  |  | $ | 34 |  |  | $ | 1 |  |  | $ | 1 |
Interest costs |  | 99 |  |  | 109 |  |  | 5 |  |  | 5 |
Expected return on plan assets |  | (133) |  |  | (128) |  |  | (8) |  |  | (8) |
Amortization of prior service costs (credits)(1) |  | 1 |  |  | — |  |  | (1) |  |  | (2) |
Net periodic benefit costs (credits) |  | $ | 2 |  |  | $ | 15 |  |  | $ | (3) |  |  | $ | (4) |
Net periodic benefit costs (credits), net of amounts capitalized |  | $ | (15) |  |  | $ | (3) |  |  | $ | (4) |  |  | $ | (4) |
(1) The income tax benefits associated with pension and OPEB prior service costs amortized out of AOCI were $1 million for the three months ended March 31, 2023.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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