Organization, Basis of Presentation and Significant Accounting Policies (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	$ 191	$ 169	$ 87
Gain on investments	72	59	54
Loss on derivative hedges	0	(38)	(35)
Total	263	190	106
Income taxes (benefits) related to reclassification to net income	101	72	40
Reclassification to net income	162	118	66
FES
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	20	18	46
Gain on investments	65	51	50
Loss on derivative hedges	9	(32)	(24)
Total	94	37	72
Income taxes (benefits) related to reclassification to net income	35	14	26
Reclassification to net income	59	23	46
OE
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	29	28	23
Gain on investments	0	6	2
Loss on derivative hedges	0	0	0
Total	29	34	25
Income taxes (benefits) related to reclassification to net income	11	12	9
Reclassification to net income	18	22	16
JCP&L
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	24	25	5
Gain on investments	0	0	0
Loss on derivative hedges	0	0	0
Total	24	25	5
Income taxes (benefits) related to reclassification to net income	10	10	3
Reclassification to net income	$ 14	$ 15	$ 2