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Fair Value (Nonrecurring Measurements) (Details) (USD $) | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 Itabo (San Lorenzo) | Dec. 31, 2013 DP&L (Conesville) | Dec. 31, 2013 DP&L | Dec. 31, 2012 DP&L | Sep. 30, 2013 Ebute | Dec. 31, 2013 MountainView | Dec. 31, 2012 St. Patrick | Dec. 31, 2013 Long Lived Assets Held And Used Itabo (San Lorenzo) | Dec. 31, 2013 Long Lived Assets Held And Used Beaver Valley | Dec. 31, 2013 Long Lived Assets Held And Used DP&L (Conesville) | Dec. 31, 2012 Long Lived Assets Held And Used Kelanitissa | Dec. 31, 2012 Long Lived Assets Held And Used U.S. wind projects | Dec. 31, 2013 Long Lived Assets Held For Sale U.S. wind turbines | Dec. 31, 2012 Long Lived Assets Held For Sale U.S. wind turbines | Dec. 31, 2012 Long Lived Assets Held For Sale St. Patrick | Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Cameroon | Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Saurashtra | Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Ukraine utilities | Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Poland wind projects | Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses U.S. wind projects | Dec. 31, 2012 Discontinued Operations and Held for Sale Businesses Tisza II | Dec. 31, 2013 Equity Method Affiliate | Dec. 31, 2012 Equity Method Affiliate | Dec. 31, 2013 Goodwill DP&L | Dec. 31, 2012 Goodwill DP&L | Dec. 31, 2013 Goodwill Ebute | Dec. 31, 2013 Goodwill MountainView | Dec. 31, 2013 Carrying Amount Long Lived Assets Held And Used Itabo (San Lorenzo) | Dec. 31, 2013 Carrying Amount Long Lived Assets Held And Used Beaver Valley | Dec. 31, 2013 Carrying Amount Long Lived Assets Held And Used DP&L (Conesville) | Dec. 31, 2012 Carrying Amount Long Lived Assets Held And Used Kelanitissa | Dec. 31, 2012 Carrying Amount Long Lived Assets Held And Used U.S. wind projects | Dec. 31, 2013 Carrying Amount Long Lived Assets Held For Sale U.S. wind turbines | Dec. 31, 2012 Carrying Amount Long Lived Assets Held For Sale U.S. wind turbines | Dec. 31, 2012 Carrying Amount Long Lived Assets Held For Sale St. Patrick | Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Cameroon | Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Saurashtra | Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Ukraine utilities | Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Poland wind projects | Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses U.S. wind projects | Dec. 31, 2012 Carrying Amount Discontinued Operations and Held for Sale Businesses Tisza II | Dec. 31, 2013 Carrying Amount Equity Method Affiliate | Dec. 31, 2012 Carrying Amount Equity Method Affiliate | Dec. 31, 2013 Carrying Amount Goodwill DP&L | Dec. 31, 2012 Carrying Amount Goodwill DP&L | Dec. 31, 2013 Carrying Amount Goodwill Ebute | Dec. 31, 2013 Carrying Amount Goodwill MountainView | Dec. 31, 2013 Fair Value Level 3 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Itabo (San Lorenzo) Level 1 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Itabo (San Lorenzo) Level 2 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Itabo (San Lorenzo) Level 3 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Beaver Valley Level 1 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Beaver Valley Level 2 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Beaver Valley Level 3 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used DP&L (Conesville) Level 1 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used DP&L (Conesville) Level 2 | Dec. 31, 2013 Fair Value Long Lived Assets Held And Used DP&L (Conesville) Level 3 | Dec. 31, 2012 Fair Value Long Lived Assets Held And Used Kelanitissa Level 1 | Dec. 31, 2012 Fair Value Long Lived Assets Held And Used Kelanitissa Level 2 | Dec. 31, 2012 Fair Value Long Lived Assets Held And Used Kelanitissa Level 3 | Dec. 31, 2012 Fair Value Long Lived Assets Held And Used U.S. wind projects Level 1 | Dec. 31, 2012 Fair Value Long Lived Assets Held And Used U.S. wind projects Level 2 | Dec. 31, 2012 Fair Value Long Lived Assets Held And Used U.S. wind projects Level 3 | Dec. 31, 2013 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 1 | Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 1 | Dec. 31, 2013 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 2 | Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 2 | Dec. 31, 2013 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 3 | Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 3 | Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale St. Patrick Level 1 | Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale St. Patrick Level 2 | Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale St. Patrick Level 3 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Cameroon Level 1 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Cameroon Level 2 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Cameroon Level 3 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Saurashtra Level 1 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Saurashtra Level 2 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Saurashtra Level 3 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Ukraine utilities Level 1 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Ukraine utilities Level 2 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Ukraine utilities Level 3 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Poland wind projects Level 1 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Poland wind projects Level 2 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Poland wind projects Level 3 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses U.S. wind projects Level 1 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses U.S. wind projects Level 2 | Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses U.S. wind projects Level 3 | Dec. 31, 2012 Fair Value Discontinued Operations and Held for Sale Businesses Tisza II Level 2 | Dec. 31, 2013 Fair Value Equity Method Affiliate Level 1 | Dec. 31, 2012 Fair Value Equity Method Affiliate Level 1 | Dec. 31, 2013 Fair Value Equity Method Affiliate Level 2 | Dec. 31, 2012 Fair Value Equity Method Affiliate Level 2 | Dec. 31, 2013 Fair Value Equity Method Affiliate Level 3 | Dec. 31, 2012 Fair Value Equity Method Affiliate Level 3 | Dec. 31, 2012 Fair Value Goodwill DP&L Level 1 | Dec. 31, 2012 Fair Value Goodwill DP&L Level 2 | Dec. 31, 2013 Fair Value Goodwill DP&L Level 3 | Dec. 31, 2012 Fair Value Goodwill DP&L Level 3 | Dec. 31, 2013 Fair Value Goodwill Ebute Level 1 | Dec. 31, 2013 Fair Value Goodwill Ebute Level 2 | Dec. 31, 2013 Fair Value Goodwill Ebute Level 3 | Dec. 31, 2013 Fair Value Goodwill MountainView Level 1 | Dec. 31, 2013 Fair Value Goodwill MountainView Level 2 | Dec. 31, 2013 Fair Value Goodwill MountainView Level 3
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  | $ 7,000,000 | $ 0 |  |  |  |  | $ 22,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,000,000 | [1] | $ 61,000,000 | [1] | $ 26,000,000 | [1] | $ 29,000,000 | [1] | $ 21,000,000 | [1] | $ 25,000,000 | [1] | $ 45,000,000 | [1] | $ 33,000,000 | [1] | $ 414,000,000 | [2] | $ 19,000,000 | [2] | $ 164,000,000 | [2] | $ 79,000,000 | [2] | $ 77,000,000 | [2] | $ 105,000,000 | [2] | $ 240,000,000 | [3] | $ 205,000,000 | [3] | $ 623,000,000 | [3] | $ 2,440,000,000 | $ 58,000,000 | [3] | $ 7,000,000 | [3] | $ 133,000,000 | $ 0 | [1] | $ 0 | [1] | $ 7,000,000 | [1] | $ 0 | [1] | $ 0 | [1] | $ 15,000,000 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 10,000,000 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 25,000,000 | [1] | $ 0 | [1] | $ 0 | [1] | $ 25,000,000 | [1] | $ 0 | [1] | $ 22,000,000 | [1] | $ 0 | [1] | $ 0 | [2] | $ 356,000,000 | [2] | $ 0 | [2] | $ 0 | [2] | $ 7,000,000 | [2] | $ 0 | [2] | $ 0 | [2] | $ 124,000,000 | [2] | $ 0 | [2] | $ 0 | [2] | $ 14,000,000 | [2] | $ 0 | [2] | $ 0 | [2] | $ 30,000,000 | [2] | $ 0 | [2] | $ 14,000,000 | [2] | $ 0 | [3] | $ 0 | $ 0 | [3] | $ 155,000,000 | [3] | $ 111,000,000 | [3] | $ 0 | $ 0 | $ 0 | $ 316,000,000 | [3] | $ 623,000,000 | $ 0 | [3] | $ 0 | [3] | $ 0 | [3] | $ 0 | [3] | $ 0 | [3] | $ 0 | [3]
Asset impairment expense | 661,000,000 | 1,940,000,000 | 366,000,000 |  |  |  |  |  |  |  | 16,000,000 | 46,000,000 | 26,000,000 | 19,000,000 | [1] | 21,000,000 | [1] | 0 | [1] | 20,000,000 | [1] | 11,000,000 | [1] | 63,000,000 | [2] | 12,000,000 | [2] | 44,000,000 | [2] | 65,000,000 | [2] | 47,000,000 | [2] | 91,000,000 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other non-operating expense | 129,000,000 | 50,000,000 | 82,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,000,000 | 50,000,000 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense | $ 372,000,000 | $ 1,817,000,000 | $ 17,000,000 |  |  | $ 307,000,000 | $ 1,820,000,000 | $ 58,000,000 | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 307,000,000 | [3] | $ 1,817,000,000 | $ 58,000,000 | [3] | $ 7,000,000 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | See Note 21 — Asset Impairment Expense for further information.
[2] | See Note 23 — Discontinued Operations and Held-For-Sale Businesses for further information. Also, the gross loss equals the carrying amount of the disposal group less its fair value less costs to sell.
[3] | See Note 9 — Other Non-Operating Expense for further information.

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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