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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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