Capitalization (Details) (USD $)	Dec. 31, 2011
FE
Preferred stock and preference stock authorizations
Shares Authorized	5,000,000
Par Value	$ 100
Penn
Preferred stock and preference stock authorizations
Shares Authorized	1,200,000
Par Value	$ 100
CEI
Preferred stock and preference stock authorizations
Shares Authorized	4,000,000
No Par Value
JCP&L
Preferred stock and preference stock authorizations
Shares Authorized	15,600,000
No Par Value
Met-Ed
Preferred stock and preference stock authorizations
Shares Authorized	10,000,000
No Par Value
Penelec
Preferred stock and preference stock authorizations
Shares Authorized	11,435,000
No Par Value
PE
Preferred stock and preference stock authorizations
Shares Authorized	10,000,000
Par Value	$ 0.01
WP
Preferred stock and preference stock authorizations
Shares Authorized	32,000,000
No Par Value
Preference Stock [Member] | OE
Preferred stock and preference stock authorizations
No Par Value
Preference Stock Shares Authorized	8,000,000
Preference Stock [Member] | CEI
Preferred stock and preference stock authorizations
No Par Value
Preference Stock Shares Authorized	3,000,000
Preference Stock [Member] | TE
Preferred stock and preference stock authorizations
Preference Stock Par Value	$ 25
Preference Stock Shares Authorized	5,000,000
Preferred Stock With Par Value 100 [Member] | OE
Preferred stock and preference stock authorizations
Shares Authorized	6,000,000
Par Value	$ 100
Preferred Stock With Par Value 100 [Member] | TE
Preferred stock and preference stock authorizations
Shares Authorized	3,000,000
Par Value	$ 100
Preferred Stock With Par Value 100 [Member] | MP
Preferred stock and preference stock authorizations
Shares Authorized	940,000
Par Value	$ 100
Preferred Stock With Par Value 25 [Member] | OE
Preferred stock and preference stock authorizations
Shares Authorized	8,000,000
Par Value	$ 25
Preferred Stock With Par Value 25 [Member] | TE
Preferred stock and preference stock authorizations
Shares Authorized	12,000,000
Par Value	$ 25