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Asset Impairment Expense (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) MW | Jun. 30, 2015 USD ($) project | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) MW | Sep. 30, 2015 USD ($) MW | Sep. 30, 2014 USD ($)
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 231,000,000 |  | $ 15,000,000 |  |  | $ 276,000,000 | $ 90,000,000
Kilroot [Member] |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 113,000,000 |  | 0 |  |  | 113,000,000 | 0
Assets, fair value | 78,000,000 |  |  |  |  | 78,000,000 |
buffalo gap III [Member] |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 118,000,000 |  | 0 |  |  | $ 118,000,000 | 0
Generation Capacity Mega Watts | MW | 170 |  |  |  |  | 170 |
Assets, fair value | $ 116,000,000 |  |  |  |  | $ 116,000,000 |
UK Wind Development Projects [Domain] |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
number of projects no longer being pursued | project |  | 2 |  |  |  |  |
number of impaired projects | project |  | 4 |  |  |  |  |
Long-Lived Assets |  | $ 38,000,000 |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 |  |  |  |  | 37,000,000 |
Assets, fair value |  | $ 1,000,000 |  |  |  |  |
East Bend DPL [Member] |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 |  | 0 |  | $ 12,000,000 | 0 | 12,000,000
Generation Capacity Mega Watts | MW |  |  |  |  | 186 |  |
Assets, fair value |  |  |  |  | $ 2,000,000 |  |
Ebute [Member] |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 |  | 15,000,000 | $ 52,000,000 |  | 0 | 67,000,000
Assets, fair value |  |  | 36,000,000 | 47,000,000 |  |  | 36,000,000
UK Wind (Newfield) [Member] |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  | 0 | $ 11,000,000 |  |  | 11,000,000
Assets, fair value |  |  | 0 |  |  |  | 0
Other Impairment [Member] |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 |  | $ 0 |  |  | $ 8,000,000 | $ 0

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