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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Statutory Federal tax rate |  |  |  |  | 21.00% | 21.00% | 21.00%
Effective Income Tax Rate Reconciliation, Disposition of Asset, Percent |  |  |  |  | (41.00%) | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent |  |  |  |  | (5.00%) | 0.00% | 0.00%
Other—net |  |  |  |  | (2.00%) | (2.00%) | (5.00%)
State taxes, net of Federal tax benefit |  |  |  |  | (2.00%) | 87.00% | (1.00%)
Taxes on foreign earnings |  |  |  |  | (10.00%) | 14.00% | (42.00%)
Valuation allowance |  |  |  |  | 52.00% | 83.00% | (10.00%)
Uncertain tax positions |  |  |  |  | 0.00% | 0.00% | 7.00%
Investment Tax Credit |  |  |  |  | 31.00% | 70.00% | 0.00%
Income Tax Expense (Benefit) | $ 103 | $ (35) | $ (51) | $ 52 | $ 59 | $ 261 | $ 265
Effective tax rate |  |  |  |  | 7.00% | 251.00% | (157.00%)
Deferred Tax Assets, Valuation Allowance |  |  |  |  | $ 913 | $ 672 |
Valuation allowance offset |  |  |  |  | 304 |  |
Valuation allowance offset, federal |  |  |  |  | $ 74 |  |
AES Southland [Domain] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  | $ 27
Sale of Stock, Description of Transaction |  |  |  |  |  | 14.9 | 14.9
AES Andes |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Statutory Federal tax rate |  |  |  |  | 0.00% | 3.00% | 127.00%
U.S. Subsidiaries |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Statutory Federal tax rate |  |  |  |  | 25.00% | 115.00% | 0.00%
AES Dominicana Renewable Energy |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ 28 |  |
Sale of Stock, Description of Transaction |  |  |  |  | 20 |  |
Ventanas |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ 42 |  |
Colon |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Sale of Stock, Description of Transaction |  |  |  |  | 35 |  |
UNITED STATES |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Statutory Federal tax rate |  |  |  |  | 21.00% |  |
Effective tax rate |  |  |  |  | 35.00% |  |
Non-US [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ 28 | $ 19 | $ 27

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