Consolidated Statements of Common Stockholders' Equity (FirstEnergy Solutions Corp.) (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrealized gain (loss) on derivative hedges taxes	$ 1	$ (1)	$ 8
Unrealized gain (loss) on investment taxes	(4)	(2)	7
Taxes on pension and other postretirement taxes	(63)	(76)	(64)
FES
Unrealized gain (loss) on derivative hedges taxes	(2)	(3)	5
Unrealized gain (loss) on investment taxes	(3)	(2)	6
Taxes on pension and other postretirement taxes	$ (6)	$ 1	$ (9)