1.0.0.3 false GOODWILL false 1 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 2 Goodwill [Abstract] 0 fe_GoodwillAbstract fe false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false No definition available. false 3 3. GOODWILL 1 us-gaap_ScheduleOfGoodwillTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 3. GOODWILL In a business combination, the excess of the purchase price over the estimated fair values of assets acquired and liabilities assumed is recognized as goodwill. FirstEnergy evaluates its goodwill for impairment at least annually and more frequently as indicators of impairment arise. FirstEnergy's 2009 annual evaluation was completed in the third quarter of 2009 with no impairment indicated. 3. GOODWILL In a business combination, the excess of the purchase price over the estimated fair values of assets acquired and liabilities assumed is recognized false false No definition available. No authoritative reference available. false false 1 2 false UnKnown UnKnown UnKnown false true