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Acquisitions and Dispositions (Dispositions Narrative) (Details) $ in Millions |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 29, 2016 USD ($) MW | Dec. 20, 2016 USD ($) MW | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
International Energy [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  | $ 1,900 |  |
DEI Latin American [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Owned Plant Capacity | MW |  | 2,230 |  |  |
Enterprise Value |  | $ 1,200 |  |  |
DEI Brazil Holdings [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Owned Plant Capacity | MW | 2,090 |  |  |  |
Enterprise Value | $ 1,200 |  |  |  |
Obligations [Member] | International Energy [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Tax obligations |  |  |  | $ 54 | $ 78

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