Stock-Based Compensation Plans (Details Textuals) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Stock-Based Compensation Plans (Textuals) [Abstract]
Common stock exchange ratio	0.667
Number of forms os stock based compensation awards	4
Number of options exercisable	3,924,595
Restricted Stock and Restricted Stock Units Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock granted	891,881
Restricted common stock grant-date fair value	$ 33.2
Restricted common stock weighted-average vesting period	2.74
Compensation expense (income)	27.0	20.0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	2.0	(6.0)
ESOP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	19.0	10.0
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option weighted-average vesting period	3.79
Compensation expense (income)	0.3	0
Stock option grant-date fair value	3.3
First Energy LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock based compensation programs	4
Maximum limit of total stock awards	29,100,000
Stock-based compensation award vesting period	From 2 months to 10 years
Stock-based compensation award number of shares available for future	5,600,000
EDCP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	0	0
EDCP and DCPD
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance	1,700,000
Deferred compensation arrangement with individual number of Shares available for grant	1,076,779
DCPD
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense (income)	2.0	2.0
Net liability of stock option	$ 6

Common stock exchange ratio.

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Deferred Compensation Arrangement With Individual Number Of Shares Available For Grant.

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Number of forms os stock based compensation awards.

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Number of stock based compensation programs.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Share based compensation arrangement by share based payment award options weighted average vesting period.

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Share based compensation arrangement by share based payment award other than stock options weighted average vesting period.

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Stock Issued During Period Shares Stock Option Exercised.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Staff Accounting Bulletin (SAB)
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The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

+ References

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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-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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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