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REGULATORY MATTERS - Reliability and FERC Matters (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 17, 2025 | Dec. 08, 2023 auditMatter | Feb. 24, 2022 | Dec. 31, 2024 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2024 USD ($)
Transmission ROE Incentive | FERC |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Public utilities, amount awarded from other party |  |  |  | $ 46 |  |
Transmission ROE Incentive | FERC | Miscellaneous Income |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Public utilities, amount awarded from other party |  |  |  | 4 |  |
Transmission ROE Incentive | FERC | Subsequent Event |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Utilities, transmission owing utilities join an RTO | 0.00500000 |  |  |  |  |
Transmission ROE Incentive | FERC | Transmission | Transmission Revenues |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Public utilities, amount awarded from other party |  |  |  | $ 42 |  |
FE | Transmission Related Vegetation Management Programs | FERC |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Utilities, transmission owing utilities join an RTO |  |  | 0.00500000 |  |  |
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
Utilities reduction in operating expense |  |  |  |  |  | 160
Utilities cooperate support |  |  |  |  |  | $ 100
Public utilities, number of unresolved audit matters referred to other offices | auditMatter |  | 2 |  |  |  |
JCP&L |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 9.60%
Allowed debt |  |  |  |  |  | 48.10%
Integrated | ATSI |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 9.88%
Demand reduction targets |  |  |  | 0.50% |  | 0.50%
Approved ROE prior to demand reduction targets |  |  |  |  |  | 10.38%
Utilities, transmission owing utilities join an RTO |  |  |  |  |  | 0.0050
Integrated | JCP&L |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 10.20%
Integrated | MP |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 10.45%
Allowed debt |  |  |  |  |  | 56.00%
Integrated | PE |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 10.45%
Allowed debt |  |  |  |  |  | 56.00%
Integrated | KATCo |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 10.45%
Integrated | MAIT |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 10.30%
Allowed debt |  |  |  |  |  | 60.00%
Integrated | TrAIL | TrAIL the Line and Black Oak SVC |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 12.70%
Integrated | TrAIL | All Other Projects |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Allowed ROE |  |  |  |  |  | 11.70%

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