Pension and Other Postemployment Benefits (Details 10) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pensions | FES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Asset (Liability)	$ (180)	$ (313)
Pensions | OE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Asset (Liability)	(182)	(108)
Pensions | JCP&L
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Asset (Liability)	(130)	(75)
OPEB | FES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Asset (Liability)	(36)	(18)
OPEB | OE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Asset (Liability)	(78)	(75)
OPEB | JCP&L
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Asset (Liability)	$ (111)	$ (94)