Derivative Instruments (Details 1)	Sep. 30, 2011 mW
Power Contracts
Volume of First Energy's outstanding derivative transactions
Purchases	34,956,000
Sales	49,696,000
Net	(14,740,000)
FTRs
Volume of First Energy's outstanding derivative transactions
Purchases	45,730,000
Sales	27,000
Net	45,703,000
NUGs
Volume of First Energy's outstanding derivative transactions
Purchases	25,442,000
Sales	0
Net	25,442,000