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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 20, 2018
Income Tax Disclosures [Line Items] |  |  |  |  |  |  |
One-time Transition Tax Rate | $ (57) |  | $ (132) |  | $ (172) | $ (363) |
Gain (Loss) on Disposition of Business | $ 3 |  | $ (89) |  | $ 7 | $ (877) |
Effective Income Tax Rate Reconciliation, Percent | 48.00% |  | 39.00% |  | 36.00% | 27.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 21.00% |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  | $ 229 | $ 1,808 |
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%
Change in Accounting Estimate, Type [Domain] | UNITED STATES |  |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |  |
One-time Transition Tax Rate |  | $ (3) |  |  |  |  |

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