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REGULATORY MATTERS - Reliability and FERC Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2022 | Sep. 30, 2021
FERC | FE | Transmission Related Vegetation Management Programs |  |  |
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 reduction in operating expense | $ 160 |  |
FERC | FE | Other Nonoperating Income (Expense) | Transmission Related Vegetation Management Programs |  |  |
Regulatory Matters [Line Items] |  |  |
Pre-tax impairment of regulatory asset |  |  | $ 21
Regulated Transmission |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 10.45% |
Approved capital structure |  | 56.00% |
Regulated Transmission | FERC |  |  |
Regulatory Matters [Line Items] |  |  |
Pre-tax impairment of regulatory asset |  | $ 25 |
ATSI | Regulated Transmission |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 10.38% |
ATSI | Regulated Transmission | FERC | Transmission Related Vegetation Management Programs |  |  |
Regulatory Matters [Line Items] |  |  |
Pre-tax impairment of regulatory asset |  |  | 48
ATSI | Regulated Distribution | FERC | Transmission Related Vegetation Management Programs |  |  |
Regulatory Matters [Line Items] |  |  |
Pre-tax impairment of regulatory asset |  |  | $ 27
JCP&L |  |  |
Regulatory Matters [Line Items] |  |  |
Allowed debt |  | 48.60% |
Approved ROE |  | 9.60% |
Approved capital structure |  | 51.40% |
JCP&L | Regulated Transmission |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 10.20% |
MAIT | Regulated Transmission |  |  |
Regulatory Matters [Line Items] |  |  |
Allowed debt |  | 60.00% |
Approved ROE |  | 10.30% |
TrAIL | Regulated Transmission | TrAIL the Line and Black Oak SVC |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 12.70% |
TrAIL | Regulated Transmission | All Other Projects |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 11.70% |
MP |  |  |
Regulatory Matters [Line Items] |  |  |
Allowed debt |  | 54.00% |
Approved capital structure |  | 46.00% |
MP | Regulated Transmission |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 11.35% |
PE | Regulated Transmission |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 11.35% |
WP |  |  |
Regulatory Matters [Line Items] |  |  |
Allowed debt |  | 49.70% |
Approved capital structure |  | 50.30% |
WP | Regulated Transmission |  |  |
Regulatory Matters [Line Items] |  |  |
Approved ROE |  | 11.35% |

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