Organization, Basis of Presentation and Significant Accounting Policies (Details 6) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss)
Net liability for unfunded retirement benefits	$ 408	$ 446
Unrealized gain on investments	15	19
Unrealized gain (loss) on derivative hedges	(38)	(39)
AOCL Balance	385	426
FES
Accumulated Other Comprehensive Income (Loss)
Net liability for unfunded retirement benefits	56	52
Unrealized gain on investments	13	16
Unrealized gain (loss) on derivative hedges	3	8
AOCL Balance	72	76
OE
Accumulated Other Comprehensive Income (Loss)
Net liability for unfunded retirement benefits	45	54
Unrealized gain on investments	0	0
Unrealized gain (loss) on derivative hedges	0	0
AOCL Balance	45	54
JCP&L
Accumulated Other Comprehensive Income (Loss)
Net liability for unfunded retirement benefits	33	40
Unrealized gain on investments	0	0
Unrealized gain (loss) on derivative hedges	(1)	(1)
AOCL Balance	$ 32	$ 39