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Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended | 25 Months Ended | 34 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Jun. 30, 2022 | Jan. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Dec. 31, 2022 | Nov. 30, 2021 | Jan. 01, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | $ 5.0 | $ 169.0 | $ 78.0 |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  | $ 322.0 | 317.0 |  |  | $ 322.0 |  |
Government Assistance Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag |  |  |  |  | Government |  |  |  |  |  |
CECONY |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | $ 10.0 | 166.0 | 74.0 |  |  |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  | 314.0 | 304.0 |  |  | 314.0 |  |
CECONY | Subsidiaries | COVID-19 Arrears Assistance Program |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Government assistance |  | $ 164.5 |  |  | 359.9 |  |  |  |  |  |
Government assistance, transaction duration (in years) |  | 4 years |  |  |  |  |  |  |  |  |
CECONY | Subsidiaries | COVID-19 Arrears Assistance Program | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Government assistance | $ 388.7 |  |  |  |  |  |  |  |  |  |
Government assistance, transaction duration (in years) | 10 years |  |  |  |  |  |  |  |  |  |
O&R | Subsidiaries | COVID-19 Arrears Assistance Program |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Government assistance |  | $ 1.6 |  |  | 6.1 |  |  |  |  |  |
Government assistance, transaction duration (in years) |  | 1 year |  |  |  |  |  |  |  |  |
O&R | Subsidiaries | COVID-19 Arrears Assistance Program | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Government assistance | $ 2.9 |  |  |  |  |  |  |  |  |  |
Government assistance, transaction duration (in years) | 1 year |  |  |  |  |  |  |  |  |  |
COVID-19 |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  |  |  | 0.5 |  |  |  | 0.5 |  |
COVID-19 | Electric | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  | $ 19.0 |  |  |  |  |  |  |
COVID-19 | Gas | Subsidiaries | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  | $ 4.0 |  |  |  |  |  |  |
COVID-19 | CECONY |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | 249.0 |  |  |  |  |  |
Allowance for credit loss, write-off |  |  |  |  |  |  |  |  | 3.0 |  |
COVID-19 | CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reserve for customer arrearages |  |  |  |  |  |  |  |  |  | $ 7.0 |
COVID-19 | CECONY | Electric | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | 43.0 |  |  |  |  |  |
COVID-19 | CECONY | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  | 7.0 |  |  |  |  |  |
COVID-19 | CECONY | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, before allowance for credit loss, current |  |  |  |  | 164.5 |  |  |  | 164.5 |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  | 108.4 |  |  |  | 108.4 |  |
Income tax rate reconciliation, tax credit |  |  |  |  | 80.0 |  |  |  |  |  |
COVID-19 | O&R |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reserve adjustments |  |  |  |  | 3.0 |  |  |  |  |  |
Allowance for credit loss, write-off |  |  |  |  |  |  |  |  | 0.0 |  |
COVID-19 | O&R | Electric | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  |  | $ 1.7 |  |  |  |
COVID-19 | O&R | Gas | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees |  |  |  |  |  | 2.4 |  |  |  |  |
COVID-19 | O&R | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, before allowance for credit loss, current |  |  |  |  | 1.6 |  |  |  | 1.6 |  |
Accounts receivable - customers, allowance for uncollectible accounts |  |  |  |  | 3.2 |  |  |  | 3.2 |  |
Income tax rate reconciliation, tax credit |  |  |  |  | $ 1.3 |  |  |  |  |  |
COVID-19 | Consolidated Edison Company of New York, Inc. And Orange And Rockland Utilities, Inc. | 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 Utilities, Inc. | Electric and Gas Transmission Projects | Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for credit loss, write-off |  |  |  |  |  |  |  | $ 11.0 | $ 46.0 |  |
Suspension period of residential terminations (in years) |  |  |  |  | 30 days |  |  |  |  |  |
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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