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PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Tables) | 9 Months Ended
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Sep. 30, 2025
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:
FirstEnergy Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Three Months Ended September 30, |  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In millions)
Service costs |  | $ | 33 |  |  | $ | 35 |  |  | $ | 1 |  |  | $ | 1 |
Interest costs |  | 93 |  |  | 99 |  |  | 5 |  |  | 5 |
Expected return on plan assets |  | (115) |  |  | (132) |  |  | (9) |  |  | (9) |
Amortization of prior service costs (credits) |  | 1 |  |  | — |  |  | (1) |  |  | — |
Net periodic benefit costs (credits) |  | $ | 12 |  |  | $ | 2 |  |  | $ | (4) |  |  | $ | (3) |
Net periodic benefit credits, net of amounts capitalized |  | $ | (6) |  |  | $ | (15) |  |  | $ | (4) |  |  | $ | (4) |
Components of Net Periodic Benefit Costs (Credits) |  | Pension | OPEB
For the Nine Months Ended September 30, |  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In millions)
Service costs |  | $ | 98 |  |  | $ | 105 |  |  | $ | 2 |  |  | $ | 2 |
Interest costs |  | 280 |  |  | 298 |  |  | 15 |  |  | 15 |
Expected return on plan assets |  | (345) |  |  | (397) |  |  | (28) |  |  | (26) |
Amortization of prior service costs (credit) |  | 1 |  |  | 1 |  |  | (1) |  |  | (1) |
Net periodic benefit costs (credits) |  | $ | 34 |  |  | $ | 7 |  |  | $ | (12) |  |  | $ | (10) |
Net periodic benefit credits, net of amounts capitalized |  | $ | (19) |  |  | $ | (45) |  |  | $ | (13) |  |  | $ | (11) |
JCP&L’s net periodic benefit costs (credits) for pension and OPEB were as follows:
|  | Pension |  | OPEB
(In millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
For the Three Months Ended September 30, |  |  |  |  |  |  |  |
JCP&L's share of net periodic benefit credits (1) |  | $ | (1) |  |  | $ | (1) |  |  | $ | (4) |  |  | $ | (3) |
Allocated net periodic benefit costs from affiliates (1) (2) |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
For the Nine Months Ended September 30, |  |  |  |  |  |  |  |
JCP&L's share of net periodic benefit credits(1) |  | $ | (3) |  |  | $ | (4) |  |  | $ | (11) |  |  | $ | (10) |
Allocated net periodic benefit costs from affiliates(1) (2) |  | $ | 7 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |
(1) Includes amounts capitalized. (2) In addition to the net periodic benefit costs for its current and former employees and retirees, JCP&L is also allocated pension and OPEB net periodic benefit costs and credits from its affiliates, primarily FESC.

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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