Capitalization (Details) - $ / shares	Dec. 31, 2019	Dec. 31, 2018	Jan. 22, 2018
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	5,000,000	5,000,000
Par Value (in dollars per share)	$ 100	$ 100	$ 100
Penn
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	1,200,000
Par Value (in dollars per share)	$ 100
CEI
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	4,000,000
JCP&L
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	15,600,000
ME
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	10,000,000
PN
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	11,435,000
PE
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	10,000,000
Par Value (in dollars per share)	$ 0.01
WP
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	32,000,000
Preferred Stock With Par Value $100 | OE
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	6,000,000
Par Value (in dollars per share)	$ 100
Preferred Stock With Par Value $100 | TE
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	3,000,000
Par Value (in dollars per share)	$ 100
Preferred Stock With Par Value $100 | MP
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	940,000
Par Value (in dollars per share)	$ 100
Preferred Stock With Par Value $25 | OE
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	8,000,000
Par Value (in dollars per share)	$ 25
Preferred Stock With Par Value $25 | TE
Preferred stock and preference stock authorizations
Shares Authorized (in shares)	12,000,000
Par Value (in dollars per share)	$ 25
Preference Stock | OE
Preferred stock and preference stock authorizations
Preference Shares Authorized (in shares)	8,000,000
Preference Stock | CEI
Preferred stock and preference stock authorizations
Preference Shares Authorized (in shares)	3,000,000
Preference Stock | TE
Preferred stock and preference stock authorizations
Preference Shares Authorized (in shares)	5,000,000
Preference Stock Par Value (in dollars per share)	$ 25