Regulatory Matters (Details) - USD ($) $ in Millions		9 Months Ended
Nov. 30, 2020	Sep. 30, 2022	Dec. 31, 2021
Regulatory assets, non-current		$ 134.9	$ 176.8
Schedule of Regulatory Assets and Liabilities [Text Block]		REGULATORY MATTERS Distribution Rate Case On November 30, 2020, AES Ohio filed a new distribution rate case with the PUCO. This rate case proposes a revenue increase of $120.8 million per year and incorporates the DIR investments that were planned and approved in the last rate case but not yet included in distribution rates, other distribution investments since September 2015 and investments necessitated by the tornados that occurred on Memorial Day in 2019. The rate case also includes a proposal for increased tree-trimming expenses and certain customer demand-side management programs and recovery of prior-approved regulatory assets for tree trimming, uncollectible expenses and rate case expense. A hearing on this case was held in January 2022, and the case is pending a commission order. Certain parties that have intervened in the distribution rate case have argued that ESP 1 incorporates a distribution rate freeze. Oral arguments regarding the potential rate freeze were held in May 2022. We are unable to predict the outcome of the distribution rate case, but if the PUCO were to impose a rate freeze that precludes AES Ohio’s ability to implement a distribution rate increase during ESP 1, it could have a material adverse effect on our results of operations, financial condition and cash flows. Electric Security Plan AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the Rate Stabilization Charge would continue as part of ESP 4. The plan requires PUCO approval. Regulatory Assets and Liabilities AES Ohio had recorded a $0.9 million regulatory asset as of December 31, 2021 relating to certain cost and revenue impacts offset by related savings of the COVID-19 pandemic, in accordance with AES Ohio’s application approved by the PUCO. During the third quarter of 2022, AES Ohio decided it will not seek recovery in a future rate proceeding and, thus, wrote off this $0.9 million deferral. Additionally, during the third quarter of 2022, AES Ohio recorded a $28.9 million reduction in regulatory assets as a charge to "Net purchased power cost" in the Condensed Consolidated Statements of Operations in accordance with the provisions of ASC 980 "Regulated Operations."
Schedule of Regulatory Assets and Liabilities [Text Block]		REGULATORY MATTERS Distribution Rate Case On November 30, 2020, AES Ohio filed a new distribution rate case with the PUCO. This rate case proposes a revenue increase of $120.8 million per year and incorporates the DIR investments that were planned and approved in the last rate case but not yet included in distribution rates, other distribution investments since September 2015 and investments necessitated by the tornados that occurred on Memorial Day in 2019. The rate case also includes a proposal for increased tree-trimming expenses and certain customer demand-side management programs and recovery of prior-approved regulatory assets for tree trimming, uncollectible expenses and rate case expense. A hearing on this case was held in January 2022, and the case is pending a commission order. Certain parties that have intervened in the distribution rate case have argued that ESP 1 incorporates a distribution rate freeze. Oral arguments regarding the potential rate freeze were held in May 2022. We are unable to predict the outcome of the distribution rate case, but if the PUCO were to impose a rate freeze that precludes AES Ohio’s ability to implement a distribution rate increase during ESP 1, it could have a material adverse effect on our results of operations, financial condition and cash flows. Electric Security Plan AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the Rate Stabilization Charge would continue as part of ESP 4. The plan requires PUCO approval. Regulatory Assets and Liabilities AES Ohio had recorded a $0.9 million regulatory asset as of December 31, 2021 relating to certain cost and revenue impacts offset by related savings of the COVID-19 pandemic, in accordance with AES Ohio’s application approved by the PUCO. During the third quarter of 2022, AES Ohio decided it will not seek recovery in a future rate proceeding and, thus, wrote off this $0.9 million deferral. Additionally, during the third quarter of 2022, AES Ohio recorded a $28.9 million reduction in regulatory assets as a charge to "Net purchased power cost" in the Condensed Consolidated Statements of Operations in accordance with the provisions of ASC 980 "Regulated Operations."
Subsidiaries [Member]
Distribution Investment Rider	$ 120.8
Regulatory assets, non-current		$ 134.9	176.8
Schedule of Regulatory Assets and Liabilities [Text Block]		REGULATORY MATTERS Distribution Rate Case On November 30, 2020, AES Ohio filed a new distribution rate case with the PUCO. This rate case proposes a revenue increase of $120.8 million per year and incorporates the DIR investments that were planned and approved in the last rate case but not yet included in distribution rates, other distribution investments since September 2015 and investments necessitated by the tornados that occurred on Memorial Day in 2019. The rate case also includes a proposal for increased tree-trimming expenses and certain customer demand-side management programs and recovery of prior-approved regulatory assets for tree trimming, uncollectible expenses and rate case expense. A hearing on this case was held in January 2022, and the case is pending a commission order. Certain parties that have intervened in the distribution rate case have argued that ESP 1 incorporates a distribution rate freeze. Oral arguments regarding the potential rate freeze were held in May 2022. We are unable to predict the outcome of the distribution rate case, but if the PUCO were to impose a rate freeze that precludes AES Ohio’s ability to implement a distribution rate increase during ESP 1, it could have a material adverse effect on our results of operations, financial condition and cash flows. Electric Security Plan AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the Rate Stabilization Charge would continue as part of ESP 4. The plan requires PUCO approval. Regulatory Assets and Liabilities AES Ohio had recorded a $0.9 million regulatory asset as of December 31, 2021 relating to certain cost and revenue impacts offset by related savings of the COVID-19 pandemic, in accordance with AES Ohio’s application approved by the PUCO. During the third quarter of 2022, AES Ohio decided it will not seek recovery in a future rate proceeding and, thus, wrote off this $0.9 million deferral. Additionally, during the third quarter of 2022, AES Ohio recorded a $28.9 million reduction in regulatory assets as a charge to "Net purchased power cost" in the Condensed Consolidated Statements of Operations in accordance with the provisions of ASC 980 "Regulated Operations."
Covid-19 Deferral Write-Off		$ 0.9
Schedule of Regulatory Assets and Liabilities [Text Block]		REGULATORY MATTERS Distribution Rate Case On November 30, 2020, AES Ohio filed a new distribution rate case with the PUCO. This rate case proposes a revenue increase of $120.8 million per year and incorporates the DIR investments that were planned and approved in the last rate case but not yet included in distribution rates, other distribution investments since September 2015 and investments necessitated by the tornados that occurred on Memorial Day in 2019. The rate case also includes a proposal for increased tree-trimming expenses and certain customer demand-side management programs and recovery of prior-approved regulatory assets for tree trimming, uncollectible expenses and rate case expense. A hearing on this case was held in January 2022, and the case is pending a commission order. Certain parties that have intervened in the distribution rate case have argued that ESP 1 incorporates a distribution rate freeze. Oral arguments regarding the potential rate freeze were held in May 2022. We are unable to predict the outcome of the distribution rate case, but if the PUCO were to impose a rate freeze that precludes AES Ohio’s ability to implement a distribution rate increase during ESP 1, it could have a material adverse effect on our results of operations, financial condition and cash flows. Electric Security Plan AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the Rate Stabilization Charge would continue as part of ESP 4. The plan requires PUCO approval. Regulatory Assets and Liabilities AES Ohio had recorded a $0.9 million regulatory asset as of December 31, 2021 relating to certain cost and revenue impacts offset by related savings of the COVID-19 pandemic, in accordance with AES Ohio’s application approved by the PUCO. During the third quarter of 2022, AES Ohio decided it will not seek recovery in a future rate proceeding and, thus, wrote off this $0.9 million deferral. Additionally, during the third quarter of 2022, AES Ohio recorded a $28.9 million reduction in regulatory assets as a charge to "Net purchased power cost" in the Condensed Consolidated Statements of Operations in accordance with the provisions of ASC 980 "Regulated Operations."
Subsidiaries [Member] \| Unrecovered OVEC Charges
Regulatory assets, non-current		$ 28.9
Subsidiaries [Member] \| COVID-19 Deferral [Member]
Regulatory assets, non-current			$ 0.9

$ 134.9

$ 176.8

Schedule of Regulatory Assets and Liabilities [Text Block]

REGULATORY MATTERS

Distribution Rate Case

On November 30, 2020, AES Ohio filed a new distribution rate case with the PUCO. This rate case proposes a revenue increase of $120.8 million per year and incorporates the DIR investments that were planned and approved in the last rate case but not yet included in distribution rates, other distribution investments since September 2015 and investments necessitated by the tornados that occurred on Memorial Day in 2019. The rate case also includes a proposal for increased tree-trimming expenses and certain customer demand-side management programs and recovery of prior-approved regulatory assets for tree trimming, uncollectible expenses and rate case expense. A hearing on this case was held in January 2022, and the case is pending a commission order. Certain parties that have intervened in the distribution rate case have argued that ESP 1 incorporates a distribution rate freeze. Oral arguments regarding the potential rate freeze were held in May 2022. We are unable to predict the outcome of the distribution rate case, but if the PUCO were to impose a rate freeze that precludes AES Ohio’s ability to implement a distribution rate increase during ESP 1, it could have a material adverse effect on our results of operations, financial condition and cash flows.

Electric Security Plan

AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability, provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the Rate Stabilization Charge would continue as part of ESP 4. The plan requires PUCO approval.

Regulatory Assets and Liabilities

AES Ohio had recorded a $0.9 million regulatory asset as of December 31, 2021 relating to certain cost and revenue impacts offset by related savings of the COVID-19 pandemic, in accordance with AES Ohio’s application approved by the PUCO. During the third quarter of 2022, AES Ohio decided it will not seek recovery in a future rate proceeding and, thus, wrote off this $0.9 million deferral.

Additionally, during the third quarter of 2022, AES Ohio recorded a $28.9 million reduction in regulatory assets as a charge to "Net purchased power cost" in the Condensed Consolidated Statements of Operations in accordance with the provisions of ASC 980 "Regulated Operations."

Distribution Investment Rider

$ 120.8

Schedule of Regulatory Assets and Liabilities [Text Block]

REGULATORY MATTERS

Distribution Rate Case

On November 30, 2020, AES Ohio filed a new distribution rate case with the PUCO. This rate case proposes a revenue increase of $120.8 million per year and incorporates the DIR investments that were planned and approved in the last rate case but not yet included in distribution rates, other distribution investments since September 2015 and investments necessitated by the tornados that occurred on Memorial Day in 2019. The rate case also includes a proposal for increased tree-trimming expenses and certain customer demand-side management programs and recovery of prior-approved regulatory assets for tree trimming, uncollectible expenses and rate case expense. A hearing on this case was held in January 2022, and the case is pending a commission order. Certain parties that have intervened in the distribution rate case have argued that ESP 1 incorporates a distribution rate freeze. Oral arguments regarding the potential rate freeze were held in May 2022. We are unable to predict the outcome of the distribution rate case, but if the PUCO were to impose a rate freeze that precludes AES Ohio’s ability to implement a distribution rate increase during ESP 1, it could have a material adverse effect on our results of operations, financial condition and cash flows.

Electric Security Plan

AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability,

provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the Rate Stabilization Charge would continue as part of ESP 4. The plan requires PUCO approval.

Regulatory Assets and Liabilities

AES Ohio had recorded a $0.9 million regulatory asset as of December 31, 2021 relating to certain cost and revenue impacts offset by related savings of the COVID-19 pandemic, in accordance with AES Ohio’s application approved by the PUCO. During the third quarter of 2022, AES Ohio decided it will not seek recovery in a future rate proceeding and, thus, wrote off this $0.9 million deferral.

Additionally, during the third quarter of 2022, AES Ohio recorded a $28.9 million reduction in regulatory assets as a charge to "Net purchased power cost" in the Condensed Consolidated Statements of Operations in accordance with the provisions of ASC 980 "Regulated Operations."

Schedule of Regulatory Assets and Liabilities [Text Block]

REGULATORY MATTERS

Distribution Rate Case

On November 30, 2020, AES Ohio filed a new distribution rate case with the PUCO. This rate case proposes a revenue increase of $120.8 million per year and incorporates the DIR investments that were planned and approved in the last rate case but not yet included in distribution rates, other distribution investments since September 2015 and investments necessitated by the tornados that occurred on Memorial Day in 2019. The rate case also includes a proposal for increased tree-trimming expenses and certain customer demand-side management programs and recovery of prior-approved regulatory assets for tree trimming, uncollectible expenses and rate case expense. A hearing on this case was held in January 2022, and the case is pending a commission order. Certain parties that have intervened in the distribution rate case have argued that ESP 1 incorporates a distribution rate freeze. Oral arguments regarding the potential rate freeze were held in May 2022. We are unable to predict the outcome of the distribution rate case, but if the PUCO were to impose a rate freeze that precludes AES Ohio’s ability to implement a distribution rate increase during ESP 1, it could have a material adverse effect on our results of operations, financial condition and cash flows.

Electric Security Plan

AES Ohio is currently operating pursuant to ESP 1. On September 26, 2022, AES Ohio filed its latest ESP (ESP 4) with the PUCO. ESP 4 is a comprehensive plan to enhance and upgrade its network and improve service reliability,

provide greater safeguards for price stability and continue investments in local economic development. As part of this plan, AES Ohio intends to increase investments in the distribution infrastructure and deploy a proactive vegetation management program. The plan also includes proposals for new customer programs, including renewable options, electric vehicle programs and energy efficiency programs for residential and low-income customers. ESP 4 also seeks to recover outstanding regulatory assets not currently in rates. AES Ohio did not propose that the Rate Stabilization Charge would continue as part of ESP 4. The plan requires PUCO approval.

Regulatory Assets and Liabilities

AES Ohio had recorded a $0.9 million regulatory asset as of December 31, 2021 relating to certain cost and revenue impacts offset by related savings of the COVID-19 pandemic, in accordance with AES Ohio’s application approved by the PUCO. During the third quarter of 2022, AES Ohio decided it will not seek recovery in a future rate proceeding and, thus, wrote off this $0.9 million deferral.

Additionally, during the third quarter of 2022, AES Ohio recorded a $28.9 million reduction in regulatory assets as a charge to "Net purchased power cost" in the Condensed Consolidated Statements of Operations in accordance with the provisions of ASC 980 "Regulated Operations."

Regulatory assets, non-current

$ 28.9

Regulatory assets, non-current

$ 0.9