REGULATORY MATTERS - Distribution Rate Orders (Details)	12 Months Ended
	Dec. 31, 2023
CEI [Member]
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	48.60%
Allowed Equity	51.40%
Approved ROE	9.60%
MAIT
Public Utilities, General Disclosures [Line Items]
Allowed debt	51.00%
Allowed Equity	49.00%
Approved ROE	10.50%
PE | West Virginia
Public Utilities, General Disclosures [Line Items]
Allowed debt	51.00%
Allowed Equity	49.00%
PE | Maryland
Public Utilities, General Disclosures [Line Items]
Allowed debt	47.00%
Allowed Equity	53.00%
Approved ROE	9.50%
PN
Public Utilities, General Disclosures [Line Items]
Allowed debt	47.40%
Allowed Equity	52.60%
Penn
Public Utilities, General Disclosures [Line Items]
Allowed debt	49.90%
Allowed Equity	50.10%
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%