Leases (Details Textuals) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended				12 Months Ended								0 Months Ended
	Mar. 31, 2013	Dec. 30, 1987	Dec. 31, 2013 Bruce Mansfield Unit 1	Dec. 31, 2013 Perry Power Plant Unit 1	Dec. 31, 2007 FGCO	Dec. 31, 2012 FGCO Bruce Mansfield Plant MW	Dec. 31, 2007 FGCO Bruce Mansfield Unit 1	Dec. 31, 2013 Nuclear Generation Corp Beaver Valley Unit 2 MW	Dec. 31, 2012 Nuclear Generation Corp Beaver Valley Unit 2 MW	Dec. 31, 2008 Nuclear Generation Corp Beaver Valley Unit 2 MW	Dec. 31, 2008 Nuclear Generation Corp Perry Plant MW	Dec. 31, 2008 TE and CEI Beaver Valley Unit 2 MW	Feb. 12, 2014 Subsequent Event Beaver Valley Unit 2	Feb. 12, 2014 Subsequent Event Nuclear Generation Corp Beaver Valley Unit 2 MW
Leases (Textuals) [Abstract]
Period of lease terms on the portions sold by OE of its ownership interests in Perry Unit 1 and Beaver Valley Unit 2 in years		29 years
Period of lease terms on the portions sold by CEI and TE of their ownership interests in Beaver Valley Unit 2 and Bruce Mansfield Units		30 years
Percentage of undivided interest of FGCO in Bruce Mansfield Unit 1					93.825%
Basic terms of operating lease							33 years
Purchase of lessor equity interests in sale and leaseback (in MW)						441.9		12.2	70.1	43.5	56.8	158.5		47.7
Purchase of lessor equity interests in sale and leaseback, value	$ 221.0					$ 262.0		$ 23.0	$ 129.0					$ 94.0
Percentage leased			93.83%	8.11%									2.60%