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USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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USD ($)
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USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
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1/1/2010 - 12/31/2010
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : CEI [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : CEI [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : CEI [Member]
1/1/2008 - 12/31/2008
USD ($)
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/><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Revenues, net of returns and allowances, realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Penelec [Member]
1/1/2010 - 12/31/2010
USD ($)
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 -Number 57
 -Paragraph 2
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : TE [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : TE [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : TE [Member]
1/1/2008 - 12/31/2008
USD ($)
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/><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Revenues, net of returns and allowances, realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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USD ($)
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USD ($)
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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USD ($)
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USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : TE [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Met-Ed [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Met-Ed [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Met-Ed [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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USD ($)
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : OE [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : TE [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : FES [Member]
1/1/2009 - 12/31/2009
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Met-Ed [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Met-Ed [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Met-Ed [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : JCP&amp;L [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : JCP&amp;L [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : JCP&amp;L [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 57
 -Paragraph 2
 -Subparagraph c

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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2009 - 12/31/2009
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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/><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Interest expense.</ElementDefenition><ElementReferences>No authoritative reference available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Interest expense to FirstEnergy</Label></Row><Row><Id>230</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName /><ElementPrefix>na</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>na</PeriodType><ShortDefinition>No definition available.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>true</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>http://firstenergycorp.com/role/transactionswithaffiliatedcompaniesdetails</PreferredLabelRole><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>2</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>3</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns><Columns><Id>101</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Penelec [Member]
1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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