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Asset Impairment Expense (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) integer | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) integer | Mar. 31, 2016 USD ($)
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | $ 235 | $ 37 | $ 394 | $ 45 |
buffalo gap II [Member] [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 0 | $ 0 | 159 | $ 0 |
UK Wind Projects [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
number of projects no longer being pursued | integer |  |  | 2 |  | 2 |
number of impaired projects | integer |  |  | 4 |  | 4 |
Long-Lived Assets |  |  | $ 38 |  | $ 38 |
Impairment of Long-Lived Assets Held-for-use |  | 0 | 37 | 0 | 37 |
Assets, fair value |  |  | 1 |  | 1 |
Other Impairment [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 0 | 0 | 0 | 8 |
Parent Company [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  | 49 |  |
DPL Subsidiary [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 235 | $ 0 | 235 | $ 0 |
Long Lived Assets Held And Used [Member] | Killen [Member] [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets, fair value |  | 84 |  | 84 |  |
Long Lived Assets Held And Used [Member] | DPL Subsidiary [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets, fair value |  | $ 5 |  | $ 5 |  |
Long Lived Assets Held And Used [Member] | buffalo gap II [Member] [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets, fair value | [1] |  |  |  |  | $ 92
Long Lived Assets Held And Used [Member] | buffalo gap II [Member] [Member] |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |
Assets, fair value |  |  |  |  |  | $ 92
[1] | See Note 13—Asset Impairment Expense for further information.

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68048823&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 Reference 3: 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 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 + Details
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