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Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions |  | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2022 USD ($) | Jul. 31, 2021 USD ($) | Aug. 31, 2020 customer | Jul. 31, 2019 customer | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 6,027.0 | $ 4,381.0 |  | $ 6,027.0
Other customer-provided capital rate |  |  |  |  | 1.75% | 1.80% |  |
Return on regulatory assets |  |  |  |  | $ 2,304.0 | $ 1,962.0 |  |
Deferred derivative losses, current, recovery period (in years) |  |  |  |  | 1 year |  |  |
Deferred derivative losses, noncurrent, recovery period (in years) |  |  |  |  | 3 years |  |  |
Net unbilled revenue deferrals |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 204.0 | 209.0 |  | 204.0
CECONY |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Net regulatory assets |  |  |  |  | 1,150.0 | 1,176.0 |  | 1,150.0
Regulatory liabilities |  |  |  |  | 5,481.0 | 3,921.0 |  | 5,481.0
Return on regulatory assets |  |  |  |  | $ 2,097.0 | 1,751.0 |  |
CECONY | Commodity |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  |  |  | 4 years |  |  |
CECONY | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 5,481.0 | 3,921.0 |  | 5,481.0
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 204.0 | 209.0 |  | 204.0
CECONY | Electric | 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 | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 330 |  |  |  |  |
Litigation settlement, amount awarded to other party |  | $ 75.1 |  |  |  |  |  |
Litigation settlement, period (in years) |  |  |  |  | 35 years |  |  |
CECONY | Electric | Protected Portion |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | $ 1,663.0
CECONY | Electric | Protected Portion | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | 1,663.0
CECONY | Electric | Unprotected Portion |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | $ 784.0
CECONY | Electric | Unprotected Portion | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  | 5 years
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | $ 784.0
CECONY | Gas | 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 | Protected Portion |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | $ 725.0
CECONY | Gas | Protected Portion | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | $ 725.0
CECONY | Gas | Unprotected Portion | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  | 5 years
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | $ 107.0
CECONY | NYSPSC | Steam | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | $ 185.0 |
O&R |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Net regulatory assets |  |  |  |  | $ 22.0 | 26.0 |  | 22.0
O&R | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 200 |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 7.0 |  |  |  |  |  |
O&R | Electric and Gas | 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 | Protected Portion | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  | $ 123.0
O&R | Electric and Gas | Unprotected Portion | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period | 6 years |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA | $ 34.0 |  |  |  |  |  |  |
RECO |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Return on regulatory assets |  |  |  |  | $ 21.0 | $ 25.0 |  |
Manhattan | CECONY | Electric | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 190 | 72 |  |  |  |
Brooklyn | CECONY | Electric | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  | 30 |  |  |  |
Foregone Customer Recovery | CECONY | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 25.0 |  |  |  |  |  |
Foregone Customer Recovery | O&R | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 2.5 |  |  |  |  |  |
Ongoing Operations And Maintenance Costs | CECONY | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 15.8 |  |  |  |  |  |
Ongoing Operations And Maintenance Costs | O&R | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 2.9 |  |  |  |  |  |
Previously Incurred Or Accrued Costs | CECONY | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 34.3 |  |  |  |  |  |
Previously Incurred Or Accrued Costs | O&R | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 1.6 |  |  |  |  |  |
Negative Revenue Adjustment | CECONY | Electric | Rainey Outages | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 5.0 |  |  |  |  |  |
Negative Revenue Adjustment | CECONY | Electric | 2019 Manhattan and Brooklyn Outages | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | 15.0 |  |  |  |  |  |
Costs To Reimburse Customers For Food And Medicine Spoilage | CECONY | Electric | Tropical Storm | Subsidiaries |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | $ 14.3 |  |  |  |  |  |

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