Contingencies and Commitments - Loss Contingencies (Details) R$ in Millions, $ in Millions	Jun. 30, 2025 USD ($)	Jun. 30, 2025 BRL (R$)	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	14		$ 5
Maximum [Member] \| Litigation [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	225
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	88
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	194
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	11
Minimum [Member] \| Environmental Remediation \| AES Sul
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	$ 1