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Fair Value (Nonrecurring Measurements) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges | $ 43 | $ 130 | $ 72 | $ 163
Other non-operating expense | 0 | 82 | 50 | 82
Goodwill impairment | 1,850 | 17 | 1,850 | 17
DP&L [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Goodwill impairment | 1,850 |  |  |
Long Lived Assets Held And Used [Member] | Kelanitissa [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  | 12 | 37
Long Lived Assets Held And Used [Member] | Wind projects [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  | 16 |
Long Lived Assets Held And Used [Member] | Wind turbines and deposits [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  |  | 116
Long Lived Assets Held And Used [Member] | Bohemia [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  |  | 9
Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  | 20 |
Long Lived Assets Held For Sale [Member] | St Patrick [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  | 11 |
Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  |  | 33
Equity Method Affiliate [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other non-operating expense |  |  | 50 |
Equity Method Affiliate [Member] | Yangcheng [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other non-operating expense |  |  |  | 74
Goodwill [Member] | DP&L [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Goodwill impairment |  |  | 1,850 |
Goodwill [Member] | Chigen [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Goodwill impairment |  |  |  | 17
Carrying Amount | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 22 | 66 | 22 | 66
Carrying Amount | Long Lived Assets Held And Used [Member] | Wind projects [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 16 |  | 16 |
Carrying Amount | Long Lived Assets Held And Used [Member] | Wind turbines and deposits [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 161 |  | 161
Carrying Amount | Long Lived Assets Held And Used [Member] | Bohemia [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 14 |  | 14
Carrying Amount | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 45 |  | 45 |
Carrying Amount | Long Lived Assets Held For Sale [Member] | St Patrick [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 33 |  | 33 |
Carrying Amount | Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 49 |  | 49
Carrying Amount | Equity Method Affiliate [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 205 |  | 205 |
Carrying Amount | Equity Method Affiliate [Member] | Yangcheng [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 100 |  | 100
Carrying Amount | Goodwill [Member] | DP&L [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 2,449 |  | 2,449 |
Carrying Amount | Goodwill [Member] | Chigen [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 17 |  | 17
Fair Value | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 | 0 | 0 | 0
Fair Value | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 | 0 | 0 | 0
Fair Value | Long Lived Assets Held And Used [Member] | Kelanitissa [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 10 | 29 | 10 | 29
Fair Value | Long Lived Assets Held And Used [Member] | Wind projects [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Long Lived Assets Held And Used [Member] | Wind projects [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Long Lived Assets Held And Used [Member] | Wind projects [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Long Lived Assets Held And Used [Member] | Wind turbines and deposits [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Long Lived Assets Held And Used [Member] | Wind turbines and deposits [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 45 |  | 45
Fair Value | Long Lived Assets Held And Used [Member] | Wind turbines and deposits [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Long Lived Assets Held And Used [Member] | Bohemia [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Long Lived Assets Held And Used [Member] | Bohemia [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 5 |  | 5
Fair Value | Long Lived Assets Held And Used [Member] | Bohemia [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Long Lived Assets Held For Sale [Member] | Wind Turbines [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 25 |  | 25 |
Fair Value | Long Lived Assets Held For Sale [Member] | St Patrick [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Long Lived Assets Held For Sale [Member] | St Patrick [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 22 |  | 22 |
Fair Value | Long Lived Assets Held For Sale [Member] | St Patrick [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Long Lived Assets Held For Sale [Member] | Carbon Reduction Projects [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 11 |  | 11
Fair Value | Equity Method Affiliate [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Equity Method Affiliate [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 155 |  | 155 |
Fair Value | Equity Method Affiliate [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Equity Method Affiliate [Member] | Yangcheng [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Equity Method Affiliate [Member] | Yangcheng [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Equity Method Affiliate [Member] | Yangcheng [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 26 |  | 26
Fair Value | Goodwill [Member] | DP&L [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Goodwill [Member] | DP&L [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 0 |  | 0 |
Fair Value | Goodwill [Member] | DP&L [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | 599 |  | 599 |
Fair Value | Goodwill [Member] | Chigen [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Goodwill [Member] | Chigen [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | 0 |  | 0
Fair Value | Goodwill [Member] | Chigen [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring |  | $ 0 |  | $ 0

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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=6943989&loc=d3e3602-108585 Reference 4: 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 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 Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=6943989&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: 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 9: 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 + 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=6880815&loc=d3e20235-122688 + Details
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