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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 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 June 30, 2016 and December 31, 2015 were as follows:
|  | 2016 |  | 2015
|  | (In millions)
FirstEnergy |  | $ | 2,456 |  |  | $ | 2,282 |
FES |  | $ | 1,510 |  |  | $ | 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 |  | (13 | ) |  | (12 | )
Liabilities incurred |  | 4 |  |  | 32 |
Accretion |  | 47 |  |  | 26 |
Balance, June 30, 2016 |  | $ | 1,448 |  |  | $ | 877 |

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