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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Tax Disclosures [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 45.00% | 108.00% | 42.00% | 48.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  | $ 58 | $ 44
Income Tax Expense (Benefit) | $ (59) | $ 113 | (51) | 202
Gener Subsidiary [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | 0 |  |  |
DPL Subsidiary [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  | 25 |  | 25
AES Mexico [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation |  |  |  | 13
Clean Energy |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | 39 |  | 46 |
AES Gener |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  | $ 13 |  | $ 21
Fluence [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 13 |  | $ 13 |

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