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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation [Abstract]  
Fair values of the decommissioning trust assets
The fair values of the decommissioning trust assets as of December 31, 2014 and 2013 were as follows:
 
 
2014
 
2013
 
 
(In millions)
FirstEnergy
 
$
2,341

 
$
2,201

FES
 
$
1,365

 
$
1,276
Changes to the asset retirement obligations
The following table summarizes the changes to the ARO balances during 2014 and 2013:
ARO Reconciliation
 
FirstEnergy
 
FES
 
 
(In millions)
Balance, January 1, 2013
 
$
1,599

 
$
965

Liabilities settled
 
(18
)
 
(18
)
Accretion
 
115

 
71

Revisions in estimated cash flows
 
(18
)
 
(3
)
Balance, December 31, 2013
 
$
1,678

 
$
1,015

Liabilities settled
 
(9
)
 
(7
)
Accretion
 
113

 
66

Revisions in estimated cash flows
 
(395
)
 
(233
)
Balance, December 31, 2014
 
$
1,387

 
$
841