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Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Intangible Assets (Textuals) [Abstract] |  |
Intangible Assets, Gross | $ 882 |
Intangible Assets, Accumulated Amortization | 762 |
Intangible Assets, Net | 120 |
Amortization Expense |  |
Actual, 2016 | 114 |
Estimated, 2017 | 11 |
Estimated, 2018 | 9 |
Estimated, 2019 | 6 |
Estimated, 2020 | 5 |
Estimated, 2021 | 5 |
Estimated, Thereafter | 72 |
Impairment charges | 92 |
NUG contracts |  |
Intangible Assets (Textuals) [Abstract] |  |
Intangible Assets, Gross | 124 |
Intangible Assets, Accumulated Amortization | 31 |
Intangible Assets, Net | 93 |
Amortization Expense |  |
Actual, 2016 | 5 |
Estimated, 2017 | 5 |
Estimated, 2018 | 5 |
Estimated, 2019 | 5 |
Estimated, 2020 | 5 |
Estimated, 2021 | 5 |
Estimated, Thereafter | 68 |
OVEC |  |
Intangible Assets (Textuals) [Abstract] |  |
Intangible Assets, Gross | 54 |
Intangible Assets, Accumulated Amortization | 48 |
Intangible Assets, Net | 6 |
Amortization Expense |  |
Actual, 2016 | 2 |
Estimated, 2017 | 1 |
Estimated, 2018 | 1 |
Estimated, 2019 | 0 |
Estimated, 2020 | 0 |
Estimated, 2021 | 0 |
Estimated, Thereafter | 4 |
Coal contracts |  |
Intangible Assets (Textuals) [Abstract] |  |
Intangible Assets, Gross | 556 |
Intangible Assets, Accumulated Amortization | 544 |
Intangible Assets, Net | 12 |
Amortization Expense |  |
Actual, 2016 | 55 |
Estimated, 2017 | 0 |
Estimated, 2018 | 0 |
Estimated, 2019 | 0 |
Estimated, 2020 | 0 |
Estimated, 2021 | 0 |
Estimated, Thereafter | 0 |
FES customer contracts |  |
Intangible Assets (Textuals) [Abstract] |  |
Intangible Assets, Gross | 148 |
Intangible Assets, Accumulated Amortization | 139 |
Intangible Assets, Net | 9 |
Amortization Expense |  |
Actual, 2016 | 52 |
Estimated, 2017 | 5 |
Estimated, 2018 | 3 |
Estimated, 2019 | 1 |
Estimated, 2020 | 0 |
Estimated, 2021 | 0 |
Estimated, Thereafter | 0 |
Loss on termination of contract | 37 |
FES |  |
Intangible Assets (Textuals) [Abstract] |  |
Intangible Assets, Net | 9 | $ 61
FES | Coal contracts |  |
Intangible Assets (Textuals) [Abstract] |  |
Intangible Assets, Gross | $ 40 |

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- Definition Intangible Assets. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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