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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Disclosures [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 108.00% | 48.00% | 48.00% | 36.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  | $ 44 | $ 229
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation | $ 13 |  |  |
Income Tax Expense (Benefit) | 113 | $ 57 | 202 | $ 172
Gener Subsidiary [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 13 |  | 21 |
DPL Subsidiary [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  |  | $ 25 |

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