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REGULATORY MATTERS - Reliability and FERC Matters (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 24, 2022 | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($)
FE | Transmission Related Vegetation Management Programs | FERC |  |  |
Regulatory Matters [Line Items] |  |  |
Refund payments |  | $ 45 |
Refund payments, net |  | 34 |
Capital assets reclassified into earnings |  | 195 |
Utilities operating expense |  | 90 |
Utilities operating expense, net |  | 67 |
Utilities reclassification to operating expense |  | 105 | $ 13
Utilities reduction in operating expense |  | 160 |
Utilities cooperate support |  | $ 310 |
Utilities, transmission owing utilities join an RTO | 0.00500000 |  |
JCP&L |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 9.60%
Allowed debt |  |  | 48.60%
Approved capital structure |  |  | 51.40%
MP |  |  |
Regulatory Matters [Line Items] |  |  |
Allowed debt |  |  | 54.00%
Approved capital structure |  |  | 46.00%
WP |  |  |
Regulatory Matters [Line Items] |  |  |
Allowed debt |  |  | 49.70%
Approved capital structure |  |  | 50.30%
Regulated Transmission | FERC |  |  |
Regulatory Matters [Line Items] |  |  |
Pre-tax impairment of regulatory asset |  |  | $ 25
Regulated Transmission | ATSI |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 10.38%
Regulated Transmission | JCP&L |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 10.20%
Regulated Transmission | MP |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 10.45%
Allowed debt |  |  | 56.00%
Regulated Transmission | PE |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 10.45%
Allowed debt |  |  | 56.00%
Regulated Transmission | WP |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 10.45%
Allowed debt |  |  | 56.00%
Regulated Transmission | MAIT |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 10.30%
Allowed debt |  |  | 60.00%
Regulated Transmission | TrAIL | All Other Projects |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 11.70%
Regulated Transmission | TrAIL | TrAIL the Line and Black Oak SVC |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  |  | 12.70%

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