Variable Interest Entities (Details Textuals) (USD $)	3 Months Ended					3 Months Ended		1 Months Ended	0 Months Ended	12 Months Ended
	Mar. 31, 2014 entities	Mar. 31, 2013	Mar. 31, 2014 Power Purchase Agreements agreements	Mar. 31, 2014 OE	Mar. 31, 2014 Other FE subsidiaries	Mar. 31, 2014 Other FE subsidiaries Power Purchase Agreements	Mar. 31, 2013 Other FE subsidiaries Power Purchase Agreements	Mar. 31, 2013 FGCO Bruce Mansfield Plant	Feb. 12, 2014 Nuclear Generation Corp Beaver Valley Unit 2	Dec. 31, 2013 Nuclear Generation Corp Beaver Valley Unit 2	Mar. 31, 2014 Path-WV	Mar. 31, 2014 Signal Peak Global Holding FEV
Variable Interest Entities (Textuals) [Abstract]
Ownership interest					0.00%							33.33%
Equity interest by unaffiliated third party in PNBV	3.00%
Equity interest by OES Ventures in PNBV				3.00%
Percentage of high-voltage transmission line project owned by subsidiary of AE on the Allegheny Series											100.00%
Percentage of high-voltage transmission line project owned by subsidiary of AE on the West Virginia Series											50.00%
Number of long-term power purchase agreements maintained by FirstEnergy with NUG entities			20
Number of contracts that may contain variable interest	2
Purchased power	$ 1,455,000,000	$ 946,000,000				$ 61,000,000	$ 49,000,000
Purchase of lessor equity interests in sale and leaseback, value								221,000,000	94,000,000	23,000,000
Net present value of FirstEnergy's consolidated sale and leaseback operating lease commitments	$ 1,100,000,000