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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Future Amortization | As of December 31, 2016, intangible assets classified in Customer Intangibles and Other Deferred Charges on FirstEnergy’s Consolidated Balance Sheet, include the following:
|  | Intangible Assets |  | Amortization Expense
|  |  |  |  |  |  |  | Actual |  | Estimated
(In millions) |  | Gross |  | Accumulated Amortization |  | Net |  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | Thereafter
NUG contracts(1) |  | $ | 124 |  |  | $ | 31 |  |  | $ | 93 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 68 |
OVEC(2) |  | 54 |  |  | 48 |  |  | 6 |  |  | 2 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 4 |
Coal contracts(2)(3)(4) |  | 556 |  |  | 544 |  |  | 12 |  |  | 55 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
FES customer contracts(5) |  | 148 |  |  | 139 |  |  | 9 |  |  | 52 |  |  | 5 |  |  | 3 |  |  | 1 |  |  | — |  |  | — |  |  | — |
|  | $ | 882 |  |  | $ | 762 |  |  | $ | 120 |  |  | $ | 114 |  |  | $ | 11 |  |  | $ | 9 |  |  | $ | 6 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 72 |
(1) | NUG contracts are subject to regulatory accounting and their amortization does not impact earnings.
(2) | Amortization expense excludes impairment charges related to intangible assets recognized in 2016, which totaled $92 million and are included in Impairment of Assets. See "Note 2, Asset Impairments" for further discussion.
(3) | The coal contracts were recorded with a regulatory offset and the amortization does not impact earnings. Accordingly, the amortization expense for these coal contracts is excluded from table above.
(4) | A gross amount of $40 million of coal contracts is related to FES. In June 2016, FES terminated a coal contract and the write-off is included in amortization expense in the table above.
(5) During 2016, FES recorded a pre-tax charge of $37 million associated with the termination of a customer contract, which is included in amortization expense in the table above.

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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