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Regulatory Matters (Details) - USD ($) $ in Millions		9 Months Ended
Regulatory Matters (Details) - USD ($) $ in Millions	Jul. 01, 2025	Sep. 30, 2024	Dec. 31, 2023
Regulatory assets, non-current		$ 146.2	$ 155.7
Schedule of Regulatory Assets and Liabilities [Text Block]		REGULATORY MATTERS Smart Grid Phase 2 Plan In February 2024, AES Ohio filed a Smart Grid Phase 2 with the PUCO proposing to invest approximately $683 million in capital projects over a 10-year period following Smart Grid Phase 1, which ends June 2025. On September 13, 2024, AES Ohio reached a settlement with the PUCO Staff and other parties on the pending Smart Grid Phase 2 Application. The Settlement will provide for a four-year plan to invest
Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Estimated Smart Grid Phase 2 costs	$ 683.0
Estimated Smart Grid Phase 2 capital	240.5
Estimated Smart Grid Phase 2 O&M	18.6
Subsidiaries [Member]
Regulatory assets, non-current		$ 146.2	$ 155.7
Schedule of Regulatory Assets and Liabilities [Text Block]		REGULATORY MATTERS Smart Grid Phase 2 Plan In February 2024, AES Ohio filed a Smart Grid Phase 2 with the PUCO proposing to invest approximately $683 million in capital projects over a 10-year period following Smart Grid Phase 1, which ends June 2025. On September 13, 2024, AES Ohio reached a settlement with the PUCO Staff and other parties on the pending Smart Grid Phase 2 Application. The Settlement will provide for a four-year plan to invest $240.5 million of capital and $18.6 million of operations and maintenance expense related to grid modernization, support of Distributed Energy Resources and Economic Development and an enhanced Telecommunications network. These costs will be recovered through the existing Investment Infrastructure Rider. If approved, AES Ohio will implement a comprehensive grid modernization project that will deliver benefits to customers, society as a whole and to AES Ohio. An evidentiary hearing was held on October 29, 2024, and we expect an order from the PUCO by the second quarter of 2025, prior to the end of Smart Grid Phase 1.
Subsidiaries [Member] \| Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Estimated Smart Grid Phase 2 costs	683.0
Estimated Smart Grid Phase 2 capital	240.5
Estimated Smart Grid Phase 2 O&M	$ 18.6