Pensions and Other Postemployment Benefits (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pensions
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	$ 14	$ 14	$ 27	$ 34
Pensions | FES
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	11	7	21	14
Pensions | OE
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(1)	(2)	(2)	(4)
Pensions | JCP&L
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(2)	(3)	(3)	(5)
OPEB
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(32)	(34)	(62)	(66)
OPEB | FES
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(8)	(9)	(16)	(16)
OPEB | OE
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(6)	(5)	(11)	(11)
OPEB | JCP&L
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	$ (2)	$ (2)	$ (4)	$ (5)