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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock-based Compensation Expense | Stock-based compensation costs and the amount of stock-based compensation costs capitalized related to FirstEnergy plans for the years ended December 31, 2023, 2022 and 2021, are included in the following tables:
|  | For the Years Ended December 31,
Stock-based Compensation Plan |  | 2023 |  | 2022 |  | 2021
|  | (In millions)
Restricted stock units |  | $ | 39 |  |  | $ | 55 |  |  | $ | 40 |
Restricted stock |  | 5 |  |  | 3 |  |  | 2 |
401(k) savings plan |  | 38 |  |  | 36 |  |  | 35 |
EDCP & DCPD |  | 1 |  |  | 7 |  |  | 13 |
Total |  | $ | 83 |  |  | $ | 101 |  |  | $ | 90 |
Stock-based compensation costs, net of amounts capitalized |  | $ | 44 |  |  | $ | 54 |  |  | $ | 43 |
Schedule of Nonvested Restricted Stock Units Activity | Restricted stock unit activity for the year ended December 31, 2023, was as follows:
Restricted Stock Unit Activity |  | Shares (in millions) |  | Weighted-Average Grant Date Fair Value (per share)
Nonvested as of January 1, 2023 |  | 1.9 |  |  | $ | 41.57 |
Granted in 2023 |  | 1.4 |  |  | 38.36 |
Forfeited in 2023 |  | (0.2) |  |  | 39.32 |
Vested in 2023(1) |  | (0.6) |  |  | 39.38 |
Nonvested as of December 31, 2023 |  | 2.5 |  |  | $ | 38.82 |
(1) Excludes dividend equivalents of approximately 63 thousand shares earned during vesting periodRestricted stock activity for the year ended 2023, was as follows:
Restricted Stock Activity |  | Shares (in millions) |  | Weighted-Average Grant Date Fair Value (per share)
Nonvested as of January 1, 2023 |  | 0.20 |  |  | $ | 42.35 |
Granted in 2023 |  | 0.30 |  |  | 37.42 |
Forfeited in 2023 |  | (0.02) |  |  | 36.86 |
Vested in 2023 |  | (0.02) |  |  | 39.45 |
Nonvested as of December 31, 2023 |  | 0.46 |  |  | $ | 39.57 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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