Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2016

Asset Retirement Obligation [Abstract]

Fair Values of the Decommissioning Trust Assets

FirstEnergy and FES maintain NDTs that are legally restricted for purposes of settling the nuclear decommissioning ARO. The fair values of the decommissioning trust assets as of September 30, 2016 and December 31, 2015 were as follows:

	2016		2015
	(In millions)
FirstEnergy	$	2,502	$	2,282
FES	$	1,542	$	1,327

Changes to ARO Balances

The following table summarizes the changes to the ARO balances during 2016:

ARO Reconciliation	FirstEnergy			FES
	(In millions)
Balance, December 31, 2015	$	1,410		$	831
Liabilities settled	(25		)	(17		)
Liabilities incurred	4			32
Accretion	70			41
Balance, September 30, 2016	$	1,459		$	887