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Regulatory Matters - COVID-19 Regulatory Matters (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($)
CECONY |  |
Public Utilities, General Disclosures [Line Items] |  |
Earned EAM incentives |  | $ 46.0
O&R |  |
Public Utilities, General Disclosures [Line Items] |  |
Earned EAM incentives |  | 3.0
COVID-19 | CECONY |  |
Public Utilities, General Disclosures [Line Items] |  |
Estimated forgone revenues | $ 20.0 | 1.2
COVID-19 | O&R |  |
Public Utilities, General Disclosures [Line Items] |  |
Estimated forgone revenues | 23.0 | 1.4
Residential Customers | COVID-19 | CECONY |  |
Public Utilities, General Disclosures [Line Items] |  |
Deferred revenue | 9.0 | 9.0
Expected deferred revenue | $ 58.0 | 58.0
Summer Cooling Credit Program | Residential Customers | COVID-19 | CECONY |  |
Public Utilities, General Disclosures [Line Items] |  |
Cost of the program |  | $ 70.6
Cost of the program, recovery period |  | 5 years

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