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REGULATORY MATTERS - Distribution Rate Orders (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2020 | Oct. 16, 2020 | Dec. 31, 2020
CEI |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 51.00%
Allowed Equity |  |  | 49.00%
Approved ROE |  |  | 10.50%
ME |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 48.80%
Allowed Equity |  |  | 51.20%
MP |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 54.00%
Allowed Equity |  |  | 46.00%
JCP&L |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt | 48.56% |  | 55.00%
Allowed Equity | 51.44% |  | 45.00%
Approved ROE | 9.60% |  | 9.60%
JCP&L | New Jersey | NJBPU |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Settled decrease in regulatory liability |  | $ 86 |
OE |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 51.00%
Allowed Equity |  |  | 49.00%
Approved ROE |  |  | 10.50%
Penn |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 49.90%
Allowed Equity |  |  | 50.10%
Penn | West Virginia |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 54.00%
Allowed Equity |  |  | 46.00%
Penn | Maryland |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 47.00%
Allowed Equity |  |  | 53.00%
Approved ROE |  |  | 9.65%
PN |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 47.40%
Allowed Equity |  |  | 52.60%
TE |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 51.00%
Allowed Equity |  |  | 49.00%
Approved ROE |  |  | 10.50%
WP |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Allowed Debt |  |  | 49.70%
Allowed Equity |  |  | 50.30%

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