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Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2022 USD ($) | Jul. 31, 2021 USD ($) | Nov. 30, 2020 USD ($) claim | Aug. 31, 2020 customer | Jul. 31, 2019 USD ($) customer | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other Customer-Provided Capital rate |  |  |  |  |  |  |  | 1.80% | 2.65% |  |  |
Return on regulatory assets |  |  |  |  |  |  |  | $ 2,027.0 |  | $ 1,696.0 |  |
Recovery period for deferred derivative losses |  |  |  |  |  |  |  | 3 years |  |  |  |
CECONY |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net regulatory assets |  |  |  |  |  |  |  | $ 1,180.0 |  | 1,200.0 |  |
CECONY | Commodity |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 4 years |  |  |  |
CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Return on regulatory assets |  |  |  |  |  |  |  | $ 1,817.0 |  | 1,509.0 |  |
CECONY | NYSPSC | Manhattan Steam Main Rupture | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property damage, clean up and response expense |  |  |  |  |  |  | $ 17.0 |  |  |  |  |
Capital and retirement costs |  |  |  |  |  |  | 9.0 |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  | $ 3.0 |  |  |  |  |
CECONY | NYSPSC | Steam | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | $ 15.0 |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  | $ 185.0 |  |  |  |  |  |
Tax credit, amortization period |  |  |  |  |  | 3 years |  |  |  |  |  |
CECONY | Electric | West Side of Manhattan | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  | 190 | 72 |  |  |  |  |  |  |
Estimate of possible loss (up to) |  |  |  |  | $ 24.8 |  |  |  |  |  |  |
CECONY | Electric | Brooklyn |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues, negative adjustment |  |  |  |  |  |  |  |  |  |  | $ 15.0 |
CECONY | Electric | Brooklyn | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  |  | 30 |  |  |  |  |  |  |
CECONY | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  | 330 |  |  |  |  |  |  |  |
Settlement agreement, amount |  | $ 75.1 |  |  |  |  |  |  |  |  |  |
Estimate of possible loss (up to) |  |  | $ 102.3 |  |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 175.0 |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  |  |  | 84.0 |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | 64.0 |  |  |  |
Operation and maintenance expenses |  |  |  |  |  |  |  | 27.0 |  |  |  |
Food and medicine spoilage expense |  |  |  |  |  |  |  | $ 7.5 |  |  |  |
Alleged number of claims, violations | claim |  |  | 33 |  |  |  |  |  |  |  |  |
Litigation settlement, period |  |  |  |  |  |  |  | 35 years |  |  |  |
CECONY | Electric | Tropical Storm | Foregone Customer Recovery | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 25.0 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Tropical Storm | Ongoing Operations And Maintenance Costs | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 15.8 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Tropical Storm | Costs To Reimburse Customers For Food And Medicine Spoilage | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 14.3 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Tropical Storm | Previously Incurred Or Accrued Costs | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 34.3 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Rainey Outages | Negative Revenue Adjustment | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 5.0 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | 2019 Manhattan and Brooklyn Outages | Negative Revenue Adjustment | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 15.0 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Scenario, Forecast | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 377.0
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  |  |  | 3 years
CECONY | Electric | Scenario, Forecast | Protected Portion | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 1,663.0
CECONY | Electric | Scenario, Forecast | Unprotected Portion | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  |  |  | 5 years
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 784.0
CECONY | Gas | Scenario, Forecast | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 63.0
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  |  |  | 2 years
CECONY | Gas | Scenario, Forecast | Protected Portion | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 725.0
CECONY | Gas | Scenario, Forecast | Unprotected Portion | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  |  |  | 5 years
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 107.0
O&R |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net regulatory assets |  |  |  |  |  |  |  | $ 26.0 |  | 29.0 |  |
O&R | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  | 200 |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 7.0 |  |  |  |  |  |  |  |  |  |
Property damage, clean up and response expense |  |  |  |  |  |  |  | 1.6 |  |  |  |
Estimate of possible loss (up to) |  |  | $ 19.0 |  |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 26.5 |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  |  |  | 19.2 |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | 5.7 |  |  |  |
Alleged number of claims, violations | claim |  |  | 38 |  |  |  |  |  |  |  |  |
O&R | Electric | Tropical Storm | Foregone Customer Recovery | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 2.5 |  |  |  |  |  |  |  |  |  |
O&R | Electric | Tropical Storm | Ongoing Operations And Maintenance Costs | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | 2.9 |  |  |  |  |  |  |  |  |  |
O&R | Electric | Tropical Storm | Previously Incurred Or Accrued Costs | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, amount |  | $ 1.6 |  |  |  |  |  |  |  |  |  |
O&R | Electric and Gas Transmission Projects | Scenario, Forecast | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 22.0
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  |  |  | 3 years
O&R | Electric and Gas Transmission Projects | Scenario, Forecast | Protected Portion | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  |  | $ 123.0
O&R | Electric and Gas Transmission Projects | Scenario, Forecast | Unprotected Portion | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period | 6 years |  |  |  |  |  |  |  |  |  |  | 15 years
Impact in regulatory liability resulting from TCJA | $ 34.0 |  |  |  |  |  |  |  |  |  |  | $ 30.0
RECO | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Return on regulatory assets |  |  |  |  |  |  |  | 24.0 |  | $ 31.0 |  |
RECO | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 11.3 |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  |  |  | 7.5 |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | 2.5 |  |  |  |
Food and medicine spoilage expense |  |  |  |  |  |  |  | $ 1.3 |  |  |  |

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