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Regulatory Matters - Ohio (Details) - OHIO - PUCO $ in Thousands |  |  |  |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2021 USD ($) | Jun. 16, 2021 USD ($) | Nov. 24, 2020 | Jul. 17, 2019 USD ($) | Jul. 15, 2019 USD ($) | Jun. 01, 2016 USD ($) | Sep. 30, 2021 USD ($) | Sep. 13, 2021 requirement | Aug. 06, 2021 USD ($) | Dec. 31, 2020 USD ($)
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  |  |  | 90.00% |  |  |  |
Energy Conservation, Economic Development and Job Retention |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Contribution amount |  |  |  |  |  | $ 51,000 |  |  |  |
Distribution Modernization Rider |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Requested plan extension period |  |  | 2 years |  |  |  |  |  |  |
Delivery Capital Recovery Rider |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Annual revenue cap for rider for years three through six |  |  |  |  |  | 20,000 |  |  |  |
Annual revenue cap for rider for years six through eight |  |  |  |  |  | $ 15,000 |  |  |  |
OCC DMR Refund | The Ohio Companies |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought |  |  |  |  | $ 42,000 |  |  |  |  |
Distribution Platform Modernization Plan |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) |  |  |  | $ 516,000 |  |  |  |  |  |
Period of grid modernization plan |  |  |  | 3 years |  |  |  |  |  |
Decoupling Rider | The Ohio Companies |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of refunds announced |  |  |  |  |  |  | $ 27,000 |  |  |
Rider CSR | The Ohio Companies |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of regulatory asset |  |  |  |  |  |  |  |  |  | $ 108,000
Impairment of regulatory asset, net |  |  |  |  |  |  |  |  |  | 84,000
Lost distribution revenue |  |  |  |  |  |  |  |  |  | $ 77,000
Rider DCR | The Ohio Companies |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) |  | $ (3,700) |  |  |  |  |  |  |  |
Rider DCR Audit Report | The Ohio Companies |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of refunds announced | $ 6,600 |  |  |  |  |  |  |  |  |
Refund to customer of pole attachment sates |  |  |  |  |  |  |  |  | $ 15 |
Number of requirements with minor non-compliance | requirement |  |  |  |  |  |  |  | 8 |  |
Number of requirements | requirement |  |  |  |  |  |  |  | 23 |  |

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