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Asset Impairment Expense (Tables) | 12 Months Ended
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Dec. 31, 2017
Impairment or Disposal of Tangible Assets Disclosure [Abstract] |
Details of Impairment of Long-Lived Assets Held and Used by Asset |
Year ended December 31, (in millions) |  | 2017 |  | 2016 |  | 2015
DPL |  | $ | 175 |  |  | $ | 859 |  |  | $ | — |
Laurel Mountain |  | 121 |  |  | — |  |  | — |
Kazakhstan Hydroelectric |  | 92 |  |  | — |  |  | — |
Kazakhstan CHPs |  | 94 |  |  | — |  |  | — |
Kilroot |  | 37 |  |  | — |  |  | 121 |
Buffalo Gap II |  | — |  |  | 159 |  |  | — |
Buffalo Gap I |  | — |  |  | 77 |  |  | — |
Buffalo Gap III |  | — |  |  | — |  |  | 116 |
U.K. Wind |  | — |  |  | — |  |  | 37 |
Other |  | 18 |  |  | 1 |  |  | 11 |
Total |  | $ | 537 |  |  | $ | 1,096 |  |  | $ | 285 |

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- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
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- References No definition available. + Details
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