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Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | $ 1 | $ 196 | $ 1 | $ 196
Eletropaulo Subsidiary [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest Prior to Disposal |  | 17.00% |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | $ 196 |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  | 238 |  |
Eletropaulo Subsidiary [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 340 |  |

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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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