Fair Value Measurements (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fair Value of Financial Instruments [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 229	$ 126	$ 226
Fuel Costs	2,317	1,432	1,153
Cash balance excluded from available for sale securities	164	193
Investment excludes Receivables, Payables and Accrued income	(52)	(7)
Fair Value of Financial Instruments (Textuals) [Abstract]
Investments not required to be disclosed	693	259
Fossil Fuel [Member]
Fair Value of Financial Instruments [Line Items]
Proceeds from assignation of long-term fossil fuel contract	130
Fuel Costs	(123)
FES
Fair Value of Financial Instruments [Line Items]
Available-for-sale Securities, Gross Realized Gains	80	92	199
Fuel Costs	1,344	1,403	1,129
Cash balance excluded from available for sale securities	74	153
Investment excludes Receivables, Payables and Accrued income	(58)	7
OE
Fair Value of Financial Instruments [Line Items]
Available-for-sale Securities, Gross Realized Gains	6	2	11
Cash balance excluded from available for sale securities	2	3
Investment excludes Receivables, Payables and Accrued income	1	1
TE
Fair Value of Financial Instruments [Line Items]
Available-for-sale Securities, Gross Realized Gains	5	3	7
Cash balance excluded from available for sale securities	2	34
JCP&L
Fair Value of Financial Instruments [Line Items]
Available-for-sale Securities, Gross Realized Gains	39	10	6
Cash balance excluded from available for sale securities	19	3
Investment excludes Receivables, Payables and Accrued income	2	(3)
Met-Ed
Fair Value of Financial Instruments [Line Items]
Available-for-sale Securities, Gross Realized Gains	64	13	2
Cash balance excluded from available for sale securities	25	(3)
Investment excludes Receivables, Payables and Accrued income	2	(9)
Penelec
Fair Value of Financial Instruments [Line Items]
Available-for-sale Securities, Gross Realized Gains	35	6	1
Cash balance excluded from available for sale securities	41	4
Investment excludes Receivables, Payables and Accrued income	$ 1	$ (3)

Cash receivables payables deferred taxes accrued income balance excluded from available for sale securities.

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Investments excludes receivables payables deferred taxes and accrued income.

+ References

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Investments not required to be disclosed.

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- Definition

Proceeds from (Payment For) Assignation Of Fuel Contract

+ References

No definition available.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 21

-Subparagraph a

-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 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

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Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(a),(d))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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