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Contingencies and Commitments - Loss Contingencies (Details) R$ in Millions, $ in Millions | Sep. 30, 2025 USD ($) | Sep. 30, 2025 BRL (R$) | Dec. 31, 2024 USD ($)
--- | --- | --- | ---
Environmental Contingencies |  |  |
Liability recorded for projected environmental remediation costs | $ 1 |  | $ 2
Litigation [Member] |  |  |
Litigation Contingencies |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | 52 |  | $ 5
Maximum [Member] | Litigation [Member] |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | 213 |  |
Maximum [Member] | Litigation [Member] | AES Sul |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | 11 | R$ 60 |
Maximum [Member] | Financial Standby Letter of Credit [Member] | Line of Credit |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | 92 |  |
Maximum [Member] | Environmental Remediation | AES Sul |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | 5 |  |
Minimum [Member] | Litigation [Member] |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | 180 |  |
Minimum [Member] | Litigation [Member] | AES Sul |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | 3 | R$ 15 |
Minimum [Member] | Financial Standby Letter of Credit [Member] | Line of Credit |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | 25 |  |
Minimum [Member] | Environmental Remediation | AES Sul |  |  |
Environmental Contingencies |  |  |
Loss Contingency, Estimate of Possible Loss | $ 1 |  |

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