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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

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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- Definition

Amount of loss contingency liability.

+ References

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X

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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