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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosures [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 22.00% | 28.00% | 16.00% | (60.00%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  | $ 91 | $ 41
Income Tax Expense (Benefit) | $ 126 | $ (147) | 75 | 55
Gener Subsidiary [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | (72) |  |  |
Guacolda [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | 28 |  | 20 |
AES Mexico [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation |  |  |  | 11
AES Gener |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  |  |  | 21
DP&L [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  |  |  | $ 25
AES Tiete [Domain] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | 96 |  | 96 |
AES Tiete [Domain] | Parent [Member] |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 44 |  | $ 44 |

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