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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | The changes in AOCI for the years ended December 31, 2023, 2022 and 2021, for FirstEnergy are shown in the following table:
|  | 2023 |  | 2022 |  | 2021
|  | (In millions)
Gains & Losses on Cash Flow Hedges(1) |  |  |  |  |  |
AOCI Balance, January 1, |  | $ | — |  |  | $ | (7) |  |  | $ | (8) |
Amounts reclassified from AOCI |  | 2 |  |  | 9 |  |  | 1 |
Income tax on other comprehensive income |  | — |  |  | 2 |  |  | — |
Other comprehensive income, net of tax |  | 2 |  |  | 7 |  |  | 1 |
AOCI Balance, December 31, |  | $ | 2 |  |  | $ | — |  |  | $ | (7) |
Defined Benefit Pension & OPEB Plans(2)(3) |  |  |  |  |  |
AOCI Balance, January 1, |  | $ | (14) |  |  | $ | (8) |  |  | $ | 3 |
Amounts reclassified from AOCI |  | (6) |  |  | (9) |  |  | (14) |
Income tax benefits on other comprehensive loss |  | (1) |  |  | (3) |  |  | (3) |
Other comprehensive loss, net of tax |  | (5) |  |  | (6) |  |  | (11) |
AOCI Balance, December 31, |  | $ | (19) |  |  | $ | (14) |  |  | $ | (8) |
Total FirstEnergy Corp. AOCI |  |  |  |  |  |
AOCI Balance, January 1, |  | $ | (14) |  |  | $ | (15) |  |  | $ | (5) |
Other comprehensive income (loss), net of tax |  | (3) |  |  | 1 |  |  | (10) |
AOCI Balance, December 31, |  | $ | (17) |  |  | $ | (14) |  |  | $ | (15) |
(1) Relates to previous cash flow hedges used to hedge fixed rate long-term debt securities prior to their issuance. Amounts reclassified from AOCI affects Interest expense line item in Consolidated Statements of Income. (2) Amortization of prior service costs are reported within Miscellaneous income, net within Other Income (Expense) on FirstEnergy’s Consolidated Statements of Income. Components are included in the computation of net periodic cost (credits), see Note 5, "Pension and Other Postemployment Benefits," for additional details. (3) Income tax (benefits) on other comprehensive income (loss) affects Income taxes line item in Consolidated Statements of Income.

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