Pension and Other Postretirement Benefits (Details 1) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
FES | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	$ 22	$ 22	$ 43	$ 44
FES | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(8)	(7)	(14)	(13)
OE | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	5	6	11	11
OE | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(5)	(6)	(12)	(12)
CEI | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	5	5	10	11
CEI | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(2)	(1)	(3)	(3)
TE | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	2	2	3	4
TE | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost			(1)	(1)
JCP&L | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	5	6	11	12
JCP&L | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(2)	(2)	(3)	(4)
Met-Ed | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	3	3	5	5
Met-Ed | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(2)	(2)	(5)	(4)
Penelec | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	4	5	9	9
Penelec | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(2)	(2)	(5)	(4)
Other FirstEnergy Subsidiaries | Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	22	15	46	29
Other FirstEnergy Subsidiaries | Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	(12)	(8)	(19)	(16)
Pension Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	68	64	138	125
Other Postretirement Benefit Cost (Credit)
Net Periodic Pension and OPEB Costs
Net periodic cost	$ (33)	$ (28)	$ (62)	$ (57)