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Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020
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 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Deferred costs |  | $ 0.3 | 0.3
COVID-19 | CECONY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimated forgone revenues |  | 21.0 | 1.0
COVID-19 | CECONY | Electric and Gas Transmission Projects |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Reserve adjustments |  |  | 46.0
Accounts Receivable, Allowance for Credit Loss, Writeoff |  |  | 8.0
COVID-19 | O&R |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimated forgone revenues |  | 44.0 | 2.0
COVID-19 | O&R | Gas |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Reserve adjustments |  |  | 2.0
Accounts Receivable, Allowance for Credit Loss, Writeoff |  |  | 1.0
Residential Customers | COVID-19 | CECONY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Deferred revenue |  | 46.8 | 46.8
Expected deferred revenue |  | 17.0 | 17.0
Summer Cooling Credit Program | Residential Customers | COVID-19 | CECONY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Expected deferred revenue |  | $ 63.6 | $ 63.6
Cost of the program | $ 70.6 |  |
Cost of the program, recovery period |  |  | 5 years

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