Capitalization (Details 3) (USD $)	Dec. 31, 2011
FE
Outstanding PCRBs for the next three years
2012	$ 1,605,000,000
2013	1,314,000,000
2014	878,000,000
2015	1,638,000,000
2016	1,050,000,000
FE \| PCRB [Member]
Outstanding PCRBs for the next three years
2012	901,000,000
2013	235,000,000
2014	26,000,000
2015	313,000,000
2016	170,000,000
FES
Outstanding PCRBs for the next three years
2012	896,000,000
2013	310,000,000
2014	125,000,000
2015	762,000,000
2016	191,000,000
FES \| PCRB [Member]
Outstanding PCRBs for the next three years
2012	828,000,000
2013	235,000,000
2014	26,000,000
2015	313,000,000
2016	170,000,000
Met-Ed
Outstanding PCRBs for the next three years
2012	29,000,000
2013	150,000,000
2014	250,000,000
2015	0
2016	0
Met-Ed \| PCRB [Member]
Outstanding PCRBs for the next three years
2012	28,000,000
2013	0
2014	0
2015	0
2016	0
Penelec
Outstanding PCRBs for the next three years
2012	45,000,000
2013	0
2014	150,000,000
2015	0
2016	0
Penelec \| PCRB [Member]
Outstanding PCRBs for the next three years
2012	45,000,000
2013	0
2014	0
2015	0
2016	$ 0

Name:	fe_PollutionControlRevenueBondsByMaturityAbstract
Namespace Prefix:	fe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant