Derivative Instruments (Details 1)	Dec. 31, 2011 MWh
Power Contracts
Volume of First Energy's outstanding derivative transactions
Purchases	32,188,000
Sales	49,737,000
Net	(17,549,000)
FTRs
Volume of First Energy's outstanding derivative transactions
Purchases	32,534,000
Sales	0
Net	32,534,000
NUGs
Volume of First Energy's outstanding derivative transactions
Purchases	23,981,000
Sales	0
Net	23,981,000