Pensions and Other Postemployment Benefits (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pensions
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	$ 14	$ 14	$ 41	$ 48
Pensions | FES
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	12	7	33	21
Pensions | OE
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(1)	(2)	(3)	(6)
Pensions | JCP&L
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(2)	(3)	(5)	(8)
OPEB
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(30)	(31)	(92)	(97)
OPEB | FES
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(8)	(8)	(24)	(24)
OPEB | OE
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	(5)	(5)	(16)	(16)
OPEB | JCP&L
Net Periodic Pension and OPEB Costs (Credits)
Net periodic benefit costs (credits)	$ (3)	$ (2)	$ (7)	$ (7)