Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Currently payable (receivable)-
Federal									$ (122)	$ (243)	$ (23)
State									28	19	35
Currently payable Total									(94)	(224)	12
Deferred, net-
Federal									580	785	432
State									78	24	27
Deferred Tax Total									658	809	459
Investment tax credit amortization									(11)	(11)	(9)
Total provision for income taxes	(105)	309	127	222	24	325	114	111	553	574	462
FES
Currently payable (receivable)-
Federal									(120)	(219)	(23)
State									17	9	(2)
Currently payable Total									(103)	(210)	(25)
Deferred, net-
Federal									208	206	142
State									10	(3)	12
Deferred Tax Total									218	203	154
Investment tax credit amortization									(4)	(4)	(4)
Total provision for income taxes	(34)	68	1	76	(125)	78	10	26	111	(11)	125
OE
Currently payable (receivable)-
Federal									56	13	37
State									(5)	(12)	(2)
Currently payable Total									51	1	35
Deferred, net-
Federal									8	65	41
State									16	13	3
Deferred Tax Total									24	78	44
Investment tax credit amortization									(1)	(1)	(1)
Total provision for income taxes	(2)	34	21	21	6	34	18	20	74	78	78
JCP&L
Currently payable (receivable)-
Federal									(120)	19	80
State									(18)	7	36
Currently payable Total									(138)	26	116
Deferred, net-
Federal									201	71	30
State									44	20	1
Deferred Tax Total									245	91	31
Investment tax credit amortization									0	0	0
Total provision for income taxes	$ (7)	$ 62	$ 30	$ 22	$ 4	$ 61	$ 32	$ 20	$ 107	$ 117	$ 147