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Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 01, 2015 | Sep. 30, 2015 | Aug. 28, 2015 | Jun. 30, 2015 | Feb. 09, 2015 | Sep. 30, 2014 | Sep. 25, 2014 | Jun. 30, 2014 | Jun. 06, 2014 | Feb. 28, 2014
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 602,000,000 | $ 383,000,000 | $ 661,000,000 |  |  |  |  |  |  |  |  |  |
Other non-operating expense |  |  |  | 0 | 128,000,000 | 129,000,000 |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  |  | 317,000,000 | 164,000,000 | $ 372,000,000 |  |  |  |  |  |  |  |  |  |
East Bend DPL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
UK Wind (Newfield) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |
buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  |  |  |  |  | $ 118,000,000 |  |  |  |  |  |  |  |
DPLER |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  | $ 136,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Buffalo Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense |  | $ 10,000,000 | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  | 217,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value | Long Lived Assets Held And Used [Member] | Ebute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |
Fair Value | Long Lived Assets Held And Used [Member] | Kilroot [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |  |  |
Fair Value | Long Lived Assets Held And Used [Member] | buffalo gap III [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  | 118,000,000 |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Cameroon businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges | [2] |  |  |  | 38,000,000 |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Carrying Amount | Cameroon businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [2] |  | 372,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value | Cameroon businesses | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [2] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value | Cameroon businesses | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [2] |  | 334,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value | Cameroon businesses | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [2] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [3] |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Entek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [3],[4] |  |  |  | 86,000,000 |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Silver Ridge Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [3],[4] |  |  |  | 42,000,000 |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Carrying Amount | Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |
Equity Method Investments [Member] | Carrying Amount | Entek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  |  | $ 211,000,000 |  |  |
Equity Method Investments [Member] | Carrying Amount | Silver Ridge Power [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3],[4] |  |  |  |  |  |  |  |  |  |  |  |  | 315,000,000 |  |
Equity Method Investments [Member] | Fair Value | Solar Spain [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Equity Method Investments [Member] | Fair Value | Solar Spain [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Equity Method Investments [Member] | Fair Value | Solar Spain [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |
Equity Method Investments [Member] | Fair Value | Entek | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Equity Method Investments [Member] | Fair Value | Entek | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |
Equity Method Investments [Member] | Fair Value | Entek | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Equity Method Investments [Member] | Fair Value | Silver Ridge Power [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3],[4] |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Equity Method Investments [Member] | Fair Value | Silver Ridge Power [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3],[4] |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Equity Method Investments [Member] | Fair Value | Silver Ridge Power [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3],[4] |  |  |  |  |  |  |  |  |  |  |  |  | 273,000,000 |  |
Long Lived Assets Held And Used [Member] | Fair Value Measurement [Domain] | Ebute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | East Bend DPL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Ebute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  |  |  | 52,000,000 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | UK Wind (Newfield) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  |  | 37,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  |  | 121,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  |  | 116,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Other Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount | East Bend DPL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount | Ebute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  | $ 51,000,000 |  | 99,000,000 |  |
Long Lived Assets Held And Used [Member] | Carrying Amount | UK Wind (Newfield) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 |
Long Lived Assets Held And Used [Member] | Carrying Amount | UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  | 38,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  | 191,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  | 234,000,000 |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Carrying Amount | Other Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  | 32,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | East Bend DPL [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | East Bend DPL [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | East Bend DPL [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Ebute [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Long Lived Assets Held And Used [Member] | Fair Value | Ebute [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Long Lived Assets Held And Used [Member] | Fair Value | Ebute [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  | $ 36,000,000 |  | $ 47,000,000 |  |
Long Lived Assets Held And Used [Member] | Fair Value | UK Wind (Newfield) [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Long Lived Assets Held And Used [Member] | Fair Value | UK Wind (Newfield) [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Long Lived Assets Held And Used [Member] | Fair Value | UK Wind (Newfield) [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Long Lived Assets Held And Used [Member] | Fair Value | UK Wind Development Projects [Domain] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | UK Wind Development Projects [Domain] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Kilroot [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Kilroot [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Kilroot [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | buffalo gap III [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | buffalo gap III [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Other Affiliates [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Other Affiliates [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  | 21,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Other Affiliates [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Long Lived Assets Held And Used [Member] | UK Wind Development Projects [Domain] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [1] |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Long Lived Assets Held And Used [Member] | buffalo gap III [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring |  |  |  |  |  |  |  | $ 118,000,000 |  |  |  |  |  |  |  |
Goodwill [Member] | DPLER |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense | [5] |  |  |  | 136,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Buffalo Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense | [5] |  |  |  | $ 28,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | DP&L [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [3] |  |  | $ 317,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Carrying Amount | DPLER |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 136,000,000
Goodwill [Member] | Carrying Amount | Buffalo Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  | 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Carrying Amount | DP&L [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  | $ 317,000,000 |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value | DPLER | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Goodwill [Member] | Fair Value | DPLER | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Goodwill [Member] | Fair Value | DPLER | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Goodwill [Member] | Fair Value | Buffalo Gap | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value | Buffalo Gap | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value | Buffalo Gap | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [5] |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value | DP&L [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value | DP&L [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Goodwill [Member] | Fair Value | DP&L [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | [3] |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
[1] | (1) See Note 21—Asset Impairment Expense for further information.
[2] | (2) See Note 23—Discontinued Operations for further information. Fair value of long-lived assets held-for-sale is presented net of costs to sell.
[3] | (3) See Note 8—Investments In and Advances to Affiliates for further information.
[4] | (4) See Note 9—Other Non-Operating Expense for further information.
[5] | (5) See Note 10—Goodwill and Other Intangible Assets for further information.

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