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Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic |  | $ 78.0 |  |  |
CECONY |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Actual earnings adjustment mechanism incentives |  | 46.0 |  |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic |  | 73.0 |  |  |
CECONY | Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Actual earnings adjustment mechanism incentives |  | 34.0 | $ 43.0 | $ 25.0 | $ 13.0
O&R |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Actual earnings adjustment mechanism incentives |  | 3.0 |  |  |
COVID-19 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Deferred costs | $ 0.5 | 0.5 |  |  |
COVID-19 | CECONY |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Estimated forgone revenues | 61.0 | 3.0 |  |  |
COVID-19 | CECONY | Electric and Gas Transmission Projects |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Reserve adjustments |  | 73.0 |  |  |
Allowance for credit loss, write-off |  | 18.0 |  |  |
COVID-19 | O&R | Gas |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Reserve adjustments |  | 2.0 |  |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic |  | 1.0 |  |  |
Allowance for credit loss, write-off |  | 1.0 |  |  |
Residential Customers | COVID-19 | CECONY |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Deferred revenue | 54.9 | $ 54.9 |  |  |
Summer Cooling Credit Program | Residential Customers | COVID-19 | CECONY |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Cost of the program, recovery period |  | 5 years |  |  |
Expected deferred revenue | $ 63.4 | $ 63.4 |  |  |

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