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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2013
Asset Retirement Obligations (Tables) [Abstract]  
Changes to the asset retirement obligations
The following table summarizes the changes to the ARO balances during 2013 and 2012:
ARO Reconciliation
 
FirstEnergy
 
FES
 
 
(In millions)
Balance, January 1, 2012
 
$
1,497

 
$
904

Liabilities settled
 
(2
)
 
(1
)
Accretion
 
104

 
62

Balance, December 31, 2012
 
1,599

 
965

Liabilities settled
 
(8
)
 
(9
)
Accretion
 
27

 
16

Revisions in estimated cash flows
 
149

 
149

Balance, March 31, 2013
 
$
1,767

 
$
1,121