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Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 13 Months Ended | 25 Months Ended | 34 Months Ended | 37 Months Ended | 39 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Jan. 31, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2021 | Nov. 30, 2021 | Jan. 01, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  | $ (78.0) | $ 19.0 |  |  |  |  |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  | 244.0 |  |  | $ 322.0 |  | $ 322.0 | $ 244.0 | $ 244.0 |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  | (78.0) | 20.0 |  |  |  |  |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  | 236.0 |  |  | 314.0 |  | 314.0 | 236.0 | 236.0 |  |  |
CECONY | Subsidiaries | COVID-19 Arrears Assistance Program |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credits issued from government assistance |  |  | 343.6 | 359.9 |  |  |  |  |  |  |  |  |
Eligible credit recovery period (in years) | 10 years |  |  |  |  |  |  |  |  |  |  |  |
O&R | Subsidiaries | COVID-19 Arrears Assistance Program |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credits issued from government assistance |  |  | 2.2 | 6.1 |  |  |  |  |  |  |  |  |
Eligible credit recovery period (in years) | 1 year |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  | $ 0.3 |  |  |  |  |  | 0.3 | 0.3 |  |  |
COVID-19 | Consolidated Edison Company of New York, Inc. And Orange And Rockland | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for customer arrearages |  |  |  |  |  |  |  |  |  |  | $ 7.0 |  |
COVID-19 | Consolidated Edison Company of New York, Inc. And Orange And Rockland | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Write off |  |  |  |  |  |  | $ 11.0 | 46.0 |  |  |  |  |
Suspension period (in days) |  |  | 30 days |  |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for customer arrearages |  |  |  |  |  |  |  |  |  |  |  | $ 7.0 |
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  |  |  |  |  |  | 172.0 |  |  |
Write off |  |  |  |  |  |  |  |  | 19.0 |  |  |  |
Account receivable, before allowance for credit loss |  |  |  |  |  | 164.5 |  | 164.5 |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  |  | 108.4 |  | 108.4 |  |  |  |  |
Tax credit |  |  | $ 2.8 | 80.0 |  |  |  |  |  |  |  |  |
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 1 Assistance Program |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  |  | 13.2 |  | 13.2 |  |  |  |  |
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 2 Assistance Program |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  |  | 327.6 |  | 327.6 |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  | 7.0 |  |  |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | $ 4.0 |  |  |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  | 43.0 |  |  |  |  |  |  |
COVID-19 | CECONY | Electric | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | $ 19.0 |  |  |  |  |  |  |  |
COVID-19 | O&R | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Account receivable, before allowance for credit loss |  |  |  |  |  | 1.6 |  | 1.6 |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  |  | $ 3.2 |  | $ 3.2 |  |  |  |  |
Tax credit |  |  |  | $ 1.3 |  |  |  |  |  |  |  |  |
COVID-19 | O&R | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 1 Assistance Program |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  | 0.1 |  |  |  |  |  | 0.1 | 0.1 |  |  |
COVID-19 | O&R | Electric and Gas Transmission Projects | Subsidiaries | COVID-19 Arrears Phase 2 Assistance Program |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  | $ 2.1 |  |  |  |  |  | 2.1 | 2.1 |  |  |
COVID-19 | O&R | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  |  |  |  |  |  | $ 2.0 |  |  |
Write off |  |  |  |  |  |  |  |  | $ 1.0 |  |  |  |
Summer Cooling Credit Program | Residential Customers | COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected deferred revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 63.4
Cost of the program, recovery period |  | 5 years |  |  |  |  |  |  |  |  |  |  |

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