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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 20, 2018
Income Tax Disclosures [Line Items] |  |  |  |  |  |  |  |
One-time Transition Tax Rate | $ (130) |  | $ (146) |  |  | $ (302) | $ (509) |
Gain (Loss) on Disposition of Business | $ (16) |  | $ 21 |  |  | $ (9) | $ (856) |
Effective Income Tax Rate Reconciliation, Percent | 31.00% |  | 44.00% |  |  | 34.00% | 30.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  | 21.00% |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  | $ 226 | $ 1,796 |
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation | $ 11 |  | $ 16 |  |  | $ 17 | $ 38 |
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 |  |  |  | $ 70 |  |  |  |
Tax on gain (loss) on disposition of business |  |  | 25 |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | $ 287 |  |  |  |
Masinloc Subsidiary [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  | $ 773 |  |  |
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) | $ (33) |  |  |  |  |

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