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Asset Impairment Expense (Impairment of Long-Lived Assets Held and Used by Asset) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | $ 1,096 | $ 285 | $ 91
DPL Subsidiary [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense | $ 624 | $ 235 | 859 | 0 | 0
Kilroot [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | 0 | 121 | 0
buffalo gap III [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | 0 | 116 | 0
Ebute [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | 0 | 0 | 67
UK Wind (Newfield) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | 0 |  | 12
UK Wind Development Projects [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  |  | 37 |
DP&L (East Bend) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | 0 | 0 | 12
buffalo gap II [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | 159 | 0 | 0
Buffalo Gap I |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | 77 | 0 | 0
Other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Asset impairment expense |  |  | $ 1 | $ 11 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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