Leases (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Rentals for capital and operating leases
Operating leases	$ 307	$ 226	$ 228
Capital leases
Interest element	5	6	2
Other	52	46	35
Total rentals	364	278	265
FES
Rentals for capital and operating leases
Operating leases	243	197	202
Capital leases
Interest element	1	1	1
Other	36	34	34
Total rentals	280	232	237
OE
Rentals for capital and operating leases
Operating leases	147	147	147
Capital leases
Interest element	0	0	0
Other	2	0	0
Total rentals	149	147	147
JCP&L
Rentals for capital and operating leases
Operating leases	8	8	9
Capital leases
Interest element	0	0	0
Other	0	0	0
Total rentals	$ 8	$ 8	$ 9