Pension and Other Postretirement Benefits (Details 11) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pensions | FES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	$ (653)	$ (488)
Pensions | OE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(4)	29
Pensions | CEI
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(12)	(22)
Pensions | TE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	11	(21)
Pensions | JCP&L
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(69)	(106)
Pensions | Met-Ed
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(6)	(6)
Pensions | Penelec
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(151)	(99)
OPEB | FES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(11)	(36)
OPEB | OE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(75)	(66)
OPEB | CEI
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(61)	(62)
OPEB | TE
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(45)	(46)
OPEB | JCP&L
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(94)	(70)
OPEB | Met-Ed
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	(31)	(19)
OPEB | Penelec
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Pension and OPEB Asset (Liability)	$ (108)	$ (85)