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Capitalization (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Capitalization [Line Items]    
Secured Debt $ 2,163 $ 2,775
Unsecured Debt 12,104 11,743
Capital Lease Obligations 176 108
Unamortized debt premiums (discounts) 45 64
Currently payable long-term debt (1,999) (1,621)
Long-term Debt and Capital Lease Obligations 15,179 15,716
FES
    
Schedule of Capitalization [Line Items]    
Secured Debt 739 949
Unsecured Debt 3,455 2,726
Capital Lease Obligations 27 31
Unamortized debt premiums (discounts) (1) (2)
Currently payable long-term debt (1,102) (905)
Long-term Debt and Capital Lease Obligations 3,118 2,799
OE
    
Schedule of Capitalization [Line Items]    
Capital Lease Obligations 29 11
Unamortized debt premiums (discounts) (10) (11)
Currently payable long-term debt (4) (2)
Long-term Debt and Capital Lease Obligations 1,172 1,155
JCP&L
    
Schedule of Capitalization [Line Items]    
Unamortized debt premiums (discounts) (6) (7)
Currently payable long-term debt (36) (34)
Long-term Debt and Capital Lease Obligations 1,701 1,736
FMBs
    
Schedule of Capitalization [Line Items]    
Other Long-term Debt 2,587 2,487
FMBs | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 3.34%  
FMBs | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 9.74%  
FMBs | OE
    
Schedule of Capitalization [Line Items]    
Other Long-term Debt 407 407
FMBs | OE | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 6.09%  
FMBs | OE | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 9.74%  
Secured notes - fixed rate
    
Schedule of Capitalization [Line Items]    
Secured Debt 2,113 2,725
Secured notes - fixed rate | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 4.982%  
Secured notes - fixed rate | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 7.88%  
Secured notes - fixed rate | FES
    
Schedule of Capitalization [Line Items]    
Secured Debt 689 899
Secured notes - fixed rate | FES | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 5.15%  
Secured notes - fixed rate | FES | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 12.00%  
Secured notes - fixed rate | JCP&L
    
Schedule of Capitalization [Line Items]    
Secured Debt 243 277
Secured notes - fixed rate | JCP&L | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 5.41%  
Secured notes - fixed rate | JCP&L | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 6.16%  
Secured notes - variable rate
    
Schedule of Capitalization [Line Items]    
Interest Rate 0.14%  
Secured Debt 50 50
Secured notes - variable rate | FES
    
Schedule of Capitalization [Line Items]    
Interest Rate 0.14%  
Secured Debt 50 50
Unsecured notes - fixed rate
    
Schedule of Capitalization [Line Items]    
Unsecured Debt 11,145 10,961
Unsecured notes - fixed rate | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 2.15%  
Unsecured notes - fixed rate | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 7.70%  
Unsecured notes - fixed rate | FES
    
Schedule of Capitalization [Line Items]    
Unsecured Debt 2,769 2,218
Unsecured notes - fixed rate | FES | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 2.15%  
Unsecured notes - fixed rate | FES | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 6.80%  
Unsecured notes - fixed rate | OE
    
Schedule of Capitalization [Line Items]    
Unsecured Debt 750 750
Unsecured notes - fixed rate | OE | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 5.45%  
Unsecured notes - fixed rate | OE | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 6.875%  
Unsecured notes - fixed rate | JCP&L
    
Schedule of Capitalization [Line Items]    
Unsecured Debt 1,500 1,500
Unsecured notes - fixed rate | JCP&L | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 4.80%  
Unsecured notes - fixed rate | JCP&L | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 7.35%  
Unsecured notes - variable rate
    
Schedule of Capitalization [Line Items]    
Unsecured Debt 959 782
Unsecured notes - variable rate | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 0.10%  
Unsecured notes - variable rate | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 2.815%  
Unsecured notes - variable rate | FES
    
Schedule of Capitalization [Line Items]    
Unsecured Debt 686 508
Unsecured notes - variable rate | FES | Minimum
    
Schedule of Capitalization [Line Items]    
Interest Rate 0.13%  
Unsecured notes - variable rate | FES | Maximum
    
Schedule of Capitalization [Line Items]    
Interest Rate 0.16%  
Unamortized merger fair value adjustments
    
Schedule of Capitalization [Line Items]    
Debt Instrument, Fair Value Disclosure $ 103 $ 160