Current liability included in adverse purchase power commitment.

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Investment in variable interest entities.

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- Definition

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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- Definition

Operating lease commitments net present value.

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- Definition

Reserve for adverse purchase power commitment.

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- Definition

Variable interest entities distributions to owners.

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- Definition

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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- Definition

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

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

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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		6 Months Ended
Variable Interest Entities (Details Textuals) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Variable Interest Entity [Line Items]
Purchased power	$ 1,220,000,000	$ 1,063,000,000	$ 2,406,000,000	$ 2,301,000,000
Number of contracts that may contain variable interest	4
Variable Interest Entities (Textuals) [Abstract]
Income (loss) attributable to noncontrolling interest	(10,000,000)	(9,000,000)	(15,000,000)	(15,000,000)
Distributions to owners			(4,000,000)
Net present value of FirstEnergy's consolidated sale and leaseback operating lease commitments			1,600,000,000
Equity or debt invested in variable interest entities	0		0
JCP&L \| Power Purchase Agreements
Variable Interest Entity [Line Items]
Purchased power	55,000,000	53,000,000	120,000,000	117,000,000
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	47,000,000		58,000,000
Power Purchase Agreements \| WP
Variable Interest Entity [Line Items]
Purchased power	21,000,000		26,000,000
Reserve for adverse purchase power commitment	59,000,000		59,000,000
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	295,000,000		295,000,000
Allegheny \| PATH-WV
Variable Interest Entity [Line Items]
Maximum Exposure	27,000,000		27,000,000
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	$ 328,463,000	$ 410,470,000	$ 698,631,000	$ 824,486,000
Number of contracts that may contain variable interest			2