Pension and Other Postretirement Benefits (Details 1) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
FES | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	$ 22	$ 22	$ 66	$ 66
FES | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(8)	(7)	(22)	(20)
OE | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	6	6	16	17
OE | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(6)	(6)	(17)	(19)
CEI | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	5	5	15	16
CEI | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(1)	(1)	(5)	(4)
TE | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	1	2	4	5
TE | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(1)	0	(1)	(1)
JCP&L | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	5	6	15	19
JCP&L | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(1)	(2)	(5)	(5)
Met-Ed | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	3	3	9	8
Met-Ed | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(2)	(2)	(7)	(6)
Penelec | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	4	5	13	14
Penelec | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(2)	(2)	(7)	(6)
Other FirstEnergy Subsidiaries | Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	22	15	69	45
Other FirstEnergy Subsidiaries | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(9)	(9)	(29)	(25)
Pension Benefit Cost
Net Periodic Pension and OPEB Costs
Net periodic cost	68	64	207	190
Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	$ (30)	$ (29)	$ (93)	$ (86)