Current liability included in adverse purchase power commitment.

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Investment in variable interest entities.

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Number of long term power purchase agreements maintained by parent company with Non utility generation entities.

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Number of variable interest contracts.

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Operating lease commitments net present value.

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Reserve for adverse purchase power commitment.

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Variable interest entities percentage of high voltage transmission line project owned By variable interest entity one in joint venture party one.

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Variable Interest Entities Percentage of high voltage transmission line project owned By variable interest entity one in joint venture party two.

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Variable Interest Entities.

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Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period.

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Long-Term transition bonds are bonds under the Competition Act in which the proceeds of Transition Bonds are required to be used principally to reduce qualified stranded costs and the related capitalization of the utility. This represents the current portion.

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-Publisher SEC

-Name Regulation S-X (SX)

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Represents an increase in noncontrolling interest from issuance of additional equity interests to noncontrolling interest holders or the sale of a portion of the parent's controlling interest.

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The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Variable Interest Entities (Details Textuals) (USD $)	3 Months Ended		9 Months Ended
Variable Interest Entities (Details Textuals) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Variable Interest Entity [Line Items]
Purchased power	$ 1,349,000,000	$ 1,319,000,000	$ 3,755,000,000	$ 3,620,000,000
Number of contracts that may contain variable interest	4
Variable Interest Entities (Textuals) [Abstract]
Income (loss) attributable to noncontrolling interest	2,000,000	4,000,000	17,000,000	19,000,000
Net present value of FirstEnergy's consolidated sale and leaseback operating lease commitments	1,600,000,000		1,600,000,000
Equity or debt invested in non-VIE NUG entities	0		0
JCP&L \| Power Purchase Agreements
Variable Interest Entity [Line Items]
Purchased power	44,000,000	73,000,000	164,000,000	190,000,000
Power Purchase Agreements
Variable Interest Entity [Line Items]
Number of long-term power purchase agreements maintained by FirstEnergy with NUG entities			23
Power Purchase Agreements \| PE
Variable Interest Entity [Line Items]
Purchased power	31,000,000		89,000,000
Power Purchase Agreements \| WP
Variable Interest Entity [Line Items]
Purchased power	14,000,000		40,000,000
Reserve for adverse purchase power commitment	56,000,000		56,000,000
Current liability included in adverse purchase power commitment	11,000,000		11,000,000
Oyster Creek Nuclear Generating Station
Variable Interest Entity [Line Items]
Bondable stranded costs	287,000,000		287,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entities (Textuals) [Abstract]
Variable Interest Entity Equity Contribution From Owners			22,000,000
Income (loss) attributable to noncontrolling interest			17,000,000
Distributions to owners			5,000,000
Allegheny \| PATH-WV
Variable Interest Entity [Line Items]
Maximum Exposure	28,000,000		28,000,000
PATH-WV
Variable Interest Entity [Line Items]
Percentage of high-voltage transmission line project owned by subsidiary of AE on the Allegheny Series	100.00%		100.00%
Percentage of high-voltage transmission line project owned by subsidiary of AE on the West Virginia Series	50.00%		50.00%
JCP&L
Variable Interest Entity [Line Items]
Purchased power	$ 429,000,000	$ 557,000,000	$ 1,127,000,000	$ 1,381,000,000
Number of contracts that may contain variable interest			2