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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 20, 2018
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 39.00% |  | 38.00% | 27.00% | 40.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% | 35.00% |
One-time Transition Tax Rate |  |  |  | 15.50% |  |
Gain (Loss) on Disposition of Business | $ (89) |  | $ 48 | $ (877) | $ 48 |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | $ 1,808 | $ 33 |
Electrica Santiago (Gener ESSA) [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business | 89 |  |  |  |  |
Tax on gain (loss) on disposition of business |  | $ 31 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates | $ 307 |  |  |  |  |
Masinloc Subsidiary [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | 777 |  |  |  |
Tax on gain (loss) on disposition of business |  | 155 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | $ 1,050 |  |  |  |
Masinloc Subsidiary [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  | 51.00%

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