Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
FES
Net exposure to loss based upon the casualty value provisions
Maximum Exposure	$ 1,268
Discounted Lease Payments, net	1,060	[1]
Net Exposure	208
Other FE subsidiaries
Net exposure to loss based upon the casualty value provisions
Maximum Exposure	828
Discounted Lease Payments, net	322	[1]
Net Exposure	$ 506

[1] The net present value of FirstEnergy’s consolidated sale and leaseback operating lease commitments is $1.2 billion.