Organization, Basis of Presentation and Significant Accounting Policies (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	$ 169	$ 87	$ 68
Gain on investments	157	54	157
Loss on derivative hedges	(26)	(35)	(67)
Total	300	106	158
Income taxes (benefits) related to reclassification to net income	118	40	60
Reclassification to net income	182	66	98
FES
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	18	46	37
Gain on investments	51	50	139
Loss on derivative hedges	(26)	(24)	(27)
Total	43	72	149
Income taxes (benefits) related to reclassification to net income	16	26	56
Reclassification to net income	27	46	93
OE
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	28	23	17
Gain on investments	6	2	10
Loss on derivative hedges	0	0	0
Total	34	25	27
Income taxes (benefits) related to reclassification to net income	12	9	10
Reclassification to net income	22	16	17
CEI
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	12	2	2
Gain on investments	0	0	0
Loss on derivative hedges	0	0	0
Total	12	2	2
Income taxes (benefits) related to reclassification to net income	4	0	1
Reclassification to net income	8	2	1
TE
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	5	3	4
Gain on investments	2	2	7
Loss on derivative hedges	0	0	0
Total	7	5	11
Income taxes (benefits) related to reclassification to net income	3	2	4
Reclassification to net income	4	3	7
JCP&L
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	25	5	8
Gain on investments	27	0	0
Loss on derivative hedges	0	0	0
Total	52	5	8
Income taxes (benefits) related to reclassification to net income	21	3	3
Reclassification to net income	31	2	5
Met-Ed
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	17	8	7
Gain on investments	49	0	0
Loss on derivative hedges	0	0	0
Total	66	8	7
Income taxes (benefits) related to reclassification to net income	27	3	3
Reclassification to net income	39	5	4
Penelec
Other comprehensive income (loss) reclassified to net income
Pensions and OPEB	23	15	12
Gain on investments	23	0	0
Loss on derivative hedges	0	0	0
Total	46	15	12
Income taxes (benefits) related to reclassification to net income	19	6	5
Reclassification to net income	$ 27	$ 9	$ 7