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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Tax Disclosures [Line Items] |  |
Effective Income Tax Rate Reconciliation, Percent | 89.00% | 28.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |
Income Tax Expense (Benefit) | $ 8 | $ 89
Gener Subsidiary [Member] |  |
Income Tax Disclosures [Line Items] |  |
Income Tax Expense (Benefit) | $ 0 |
AES Mexico [Member] |  |
Income Tax Disclosures [Line Items] |  |
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation |  | $ 19

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