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Dispositions and Held-for-Sale Businesses Dispositions and Held-for-Sale Businesses (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2015 USD ($) MW | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Aug. 31, 2015 MW | Aug. 22, 2014 MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of ownership interest |  |  |  | $ (461) | $ 0 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | UK Wind Projects [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  |  | 100.00%
Disposal Group Not Discontinued Operation Generation Capacity | MW |  |  |  |  |  |  | 88
Proceeds from sale of ownership interest |  |  | $ 161 |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | 78 |  |  |  |
Pre-tax loss of disposed businesses, Excluding gain on disposal, included in continuing operations |  |  | 19 |  | 18 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Armenia Mountain [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Gross Profit (Loss) |  |  | (1) | 6 | 4 |  |
Net proceeds received from sale of businesses | $ 64 |  |  |  |  |  |
Generation Capacity Mega Watts | MW | 101 |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | $ 22 |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kelanitissa [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Sale of ownership in subsidiary percent |  |  |  |  |  | 90.00% |
Generation Capacity Mega Watts | MW |  |  |  |  |  | 168 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  | $ (2) | $ (1) | $ (7) | $ 1 |  |

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- Definition Percentage of equity interest in business disposed. + References No definition available. + Details
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