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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation [Abstract]  
Fair values of the decommissioning trust assets
The fair values of the decommissioning trust assets as of December 31, 2017 and 2016 were as follows:
 
 
2017
 
2016
 
 
(In millions)
FirstEnergy
 
$
2,678

 
$
2,514

FES
 
$
1,856

 
$
1,552
Changes to the asset retirement obligations
The following table summarizes the changes to the ARO balances during 2017 and 2016:
ARO Reconciliation
 
FirstEnergy
 
FES
 
 
(In millions)
Balance, January 1, 2016
 
$
1,410

 
$
831

Liabilities settled
 
(27
)
 
(18
)
Accretion
 
95

 
56

Liabilities Incurred
 
4

 
32

Balance, December 31, 2016
 
$
1,482

 
$
901

Changes in timing of estimated cash flows (1)
 
944

 
944

Liabilities settled
 
(12
)
 
(11
)
Accretion
 
101

 
62

Liabilities Incurred
 
—

 
49

Balance, December 31, 2017
 
$
2,515

 
$
1,945


             
(1) See Note 2, "Asset Sales and Impairments" for further discussion.