Leases (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Rentals for capital and operating leases
Operating leases	$ 226		$ 228		$ 236
Capital leases
Interest element	6		2		1
Other	46	[1]	35	[1]	16	[1]
Total rentals	278		265		253
FES
Rentals for capital and operating leases
Operating leases	197		202		202
Capital leases
Interest element	1		1		2
Other	34	[1]	34	[1]	18	[1]
Total rentals	232		237		222
OE
Rentals for capital and operating leases
Operating leases	147		147		146
Capital leases
Interest element	0		0		1
Other	0	[1]	0	[1]	0	[1]
Total rentals	147		147		147
CEI
Rentals for capital and operating leases
Operating leases	4		4		4
Capital leases
Interest element	1		1		1
Other	0	[1]	0	[1]	0	[1]
Total rentals	5		5		5
TE
Rentals for capital and operating leases
Operating leases	64		64		64
Capital leases
Interest element	0		0		0
Other	0	[1]	0	[1]	0	[1]
Total rentals	64		64		64
JCP&L
Rentals for capital and operating leases
Operating leases	8		9		9
Capital leases
Interest element	0		0		0
Other	0	[1]	0	[1]	0	[1]
Total rentals	8		9		9
Met-Ed
Rentals for capital and operating leases
Operating leases	4		7		7
Capital leases
Interest element	0		0		0
Other	0	[1]	1	[1]	0	[1]
Total rentals	4		8		7
Penelec
Rentals for capital and operating leases
Operating leases	4		4		4
Capital leases
Interest element	0		0		0
Other	0	[1]	0	[1]	0	[1]
Total rentals	$ 4		$ 4		$ 4

[1] FirstEnergy and FES include $29 million, $30 million and $16 million, in 2011, 2010 and 2009, respectively, for wind purchased power agreements classified as capital leases.