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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Future Amortization | As of December 31, 2017, intangible assets classified in Other Deferred Charges on FirstEnergy’s Consolidated Balance Sheet, include the following:
|  | Intangible Assets |  | Amortization Expense
|  |  |  |  |  |  |  | Actual |  | Estimated
(In millions) |  | Gross |  | Accumulated Amortization |  | Net |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter
NUG contracts(1) |  | $ | 124 |  |  | $ | 36 |  |  | $ | 88 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 63 |
OVEC |  | 8 |  |  | 3 |  |  | 5 |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 4 |
Coal contracts(2) |  | 102 |  |  | 94 |  |  | 8 |  |  | 4 |  |  | 3 |  |  | 3 |  |  | 2 |  |  | — |  |  | — |  |  | — |
FES customer contracts |  | 148 |  |  | 144 |  |  | 4 |  |  | 5 |  |  | 3 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |
|  | $ | 382 |  |  | $ | 277 |  |  | $ | 105 |  |  | $ | 15 |  |  | $ | 11 |  |  | $ | 10 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 67 |
(1) | NUG contracts are subject to regulatory accounting and their amortization does not impact earnings.
(2) | The coal contracts were recorded with a regulatory offset and their amortization does not impact earnings.

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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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