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Short-Term Borrowings and Bank Lines of Credit (Details Textuals) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Short-term borrowings $ 0 $ 700,000,000
Unused and available short term bank lines of credit 4,343,000,000  
Maximum amount borrowed under revolving credit facility 5,000,000,000  
Principal Default Amount Specified In Debt Covenants 100,000,000  
ATSI
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 100,000,000  
JCP&L
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 425,000,000 [1]  
Average interest rate for borrowings 0.51% 0.00%
Met-Ed
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 300,000,000 [1]  
Average interest rate for borrowings 0.51% 0.51%
CEI
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 500,000,000  
Average interest rate for borrowings 0.00% 1.92%
TE
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 500,000,000  
FE
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 2,000,000,000 [2]  
Average interest rate for borrowings 0.00% 0.68%
Revolving Credit Facility
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 500,000,000  
Revolving Credit Facility | FES / AE Supply
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Unused and available short term bank lines of credit 2,498,000,000  
Maximum amount borrowed under revolving credit facility 2,500,000,000  
Revolving Credit Facility | Parent and Certain Subsidiaries
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Maximum amount borrowed under revolving credit facility 4,500,000,000  
Revolving Credit Facility | FirstEnergy
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Unused and available short term bank lines of credit 1,395,000,000 [3]  
Maximum amount borrowed under revolving credit facility 2,000,000,000 [3]  
Revolving Credit Facility | TrAIL
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Unused and available short term bank lines of credit 450,000,000  
Maximum amount borrowed under revolving credit facility 450,000,000  
Revolving Credit Facility | AGC
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Unused and available short term bank lines of credit 0  
Maximum amount borrowed under revolving credit facility 50,000,000  
Available for Issuance of Letters of Credit | FE
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Amount of revolving line of credit $ 700,000,000  
Money Pool | Regulated Companies
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Average interest rate for borrowings 0.44%  
Money Pool | Unregulated Companies
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Average interest rate for borrowings 0.42%  
Minimum | Revolving Credit Facility
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Term of revolving credit facility, in days 364  
Maximum | Money Pool
    
Short-Term Borrowings and Bank Lines of Credit (Textuals) [Abstract]    
Term of revolving credit facility, in days 364  
[1] Excluding amounts which may be borrowed under the regulated companies’ money pool.
[2] No limitations.
[3] FE and the Utilities