Taxes (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
General Taxes
Total general taxes	$ 985	$ 978	$ 776
Kilowatt hour excise
General Taxes
Total general taxes	230	244	245
State gross receipts
General Taxes
Total general taxes	251	264	185
Real and personal property
General Taxes
Total general taxes	329	299	243
Social security and unemployment
General Taxes
Total general taxes	126	109	86
Others
General Taxes
Total general taxes	49	62	17
FES
General Taxes
Total general taxes	136	124	94
FES | Kilowatt hour excise
General Taxes
Total general taxes	0	0	5
FES | State gross receipts
General Taxes
Total general taxes	77	62	17
FES | Real and personal property
General Taxes
Total general taxes	35	42	53
FES | Social security and unemployment
General Taxes
Total general taxes	20	14	14
FES | Others
General Taxes
Total general taxes	4	6	5
OE
General Taxes
Total general taxes	193	190	183
OE | Kilowatt hour excise
General Taxes
Total general taxes	88	90	92
OE | State gross receipts
General Taxes
Total general taxes	15	17	15
OE | Real and personal property
General Taxes
Total general taxes	80	73	67
OE | Social security and unemployment
General Taxes
Total general taxes	10	9	8
OE | Others
General Taxes
Total general taxes	0	1	1
JCP&L
General Taxes
Total general taxes	55	67	65
JCP&L | Kilowatt hour excise
General Taxes
Total general taxes	37	50	51
JCP&L | State gross receipts
General Taxes
Total general taxes	0	0	0
JCP&L | Real and personal property
General Taxes
Total general taxes	6	6	5
JCP&L | Social security and unemployment
General Taxes
Total general taxes	12	11	9
JCP&L | Others
General Taxes
Total general taxes	$ 0	$ 0	$ 0