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Regulatory Matters (Details) - USD ($) $ in Millions		3 Months Ended
Regulatory Matters (Details) - USD ($) $ in Millions	Jul. 01, 2025	Mar. 31, 2024	Dec. 31, 2023
Regulatory assets, non-current		$ 146.0	$ 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 the Smart Grid Phase 1, which ends June 2025. There are three principal components of AES Ohio’s Smart Grid Phase 2: 1) Distribution Operations, 2) Advanced Intelligence 3) Telecommunications and Cybersecurity. These initiatives will also allow AES Ohio to be ready to leverage and integrate Distributed Energy Resources into its grid. 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. A procedural schedule has been set with a hearing to begin in September 2024. We expect an order from the PUCO by the second quarter of 2025, prior to the end of Smart Grid Phase 1.
Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Estimated Smart Grid Phase 2 costs	$ 683.0
Subsidiaries [Member]
Regulatory assets, non-current		$ 146.0	$ 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 the Smart Grid Phase 1, which ends June 2025. There are three principal components of AES Ohio’s Smart Grid Phase 2: 1) Distribution Operations, 2) Advanced Intelligence 3) Telecommunications and Cybersecurity. These initiatives will also allow AES Ohio to be ready to leverage and integrate Distributed Energy Resources into its grid. 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. A procedural schedule has been set with a hearing to begin in September 2024. 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