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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation [Abstract]  
Fair values of the decommissioning trust assets
The fair values of the decommissioning trust assets as of December 31, 2016 and 2015 were as follows:
 
 
2016
 
2015
 
 
(In millions)
FirstEnergy
 
$
2,514

 
$
2,282

FES
 
$
1,552

 
$
1,327
Changes to the asset retirement obligations
The following table summarizes the changes to the ARO balances during 2016 and 2015:
ARO Reconciliation
 
FirstEnergy
 
FES
 
 
(In millions)
Balance, January 1, 2015
 
$
1,387

 
$
841

Liabilities settled
 
(13
)
 
(8
)
Accretion
 
92

 
55

Revisions in estimated cash flows
 
(56
)
 
(57
)
Balance, December 31, 2015
 
$
1,410

 
$
831

Liabilities settled
 
(27
)
 
(18
)
Accretion
 
95

 
56

Liabilities Incurred
 
4

 
32

Balance, December 31, 2016
 
$
1,482

 
$
901