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Consolidated Statements of Common Stockholders' Equity (FirstEnergy Corp.) (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrealized gain (loss) on derivative hedges taxes	$ 1	$ 8	$ 14
Unrealized gain (loss) on investment taxes	(2)	7	3
Taxes on pension and other postretirement taxes	$ (76)	$ (64)	$ (91)

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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