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Asset Impairment Expense (Details) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 09, 2013 MW | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | $ 63,000,000 | $ 0 | $ 75,000,000 | $ 48,000,000
Beaver Valley [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 0 | 0 | 0 | 46,000,000
Generation capacity mega watts | 125 |  |  |  |
Lump sum payment received for termination of PPA | 60,000,000 |  |  |  |
East Bend DPL [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 0 | 0 | 12,000,000 | 0
Generation capacity mega watts |  | 186 |  | 186 |
Assets, fair value |  | 2,000,000 |  | 2,000,000 |
Ebute [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 52,000,000 | 0 | 52,000,000 | 0
Assets, fair value |  | 47,000,000 |  | 47,000,000 |
UK Wind (Newfield) [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 11,000,000 | 0 | 11,000,000 | 0
Assets, fair value |  | 0 |  | 0 |
Other Impairment [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | $ 0 | $ 0 | $ 0 | $ 2,000,000

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- Definition Generation Capacity Mega Watts + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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=8077374&loc=d3e2420-110228 Reference 3: 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=6391110&loc=d3e2921-110230 Reference 4: 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=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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