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Regulatory Matters - Additional Information (Details) customer in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 13, 2019 USD ($) customer | Jan. 31, 2019 | Mar. 31, 2018 customer | Apr. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 4,987.0 | $ 4,370.0 |  |
Regulatory liabilities |  |  |  |  |  |  |  | 4,827.0 | 4,641.0 |  |
Future Income Tax |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | 54.0 | $ 3,713.0 |
Regulatory liabilities |  |  |  |  |  |  |  | 2,426.0 | 2,515.0 |  |
Net Unbilled Revenue Deferrals |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  |  | 199.0 | 117.0 |  |
RECO | Electric | Hurricane |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 44 |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 17.0 |  |  |
RECO | FERC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 17.7 | $ 11.8 |  |  |  |  |  |
Return on common equity (percent) |  |  |  |  |  |  | 10.00% |  |  |  |
CECONY |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 4,600.0 | 3,987.0 |  |
Regulatory liabilities |  |  |  |  |  |  |  | 4,427.0 | 4,258.0 |  |
CECONY | Future Income Tax |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | 49.0 | $ 3,513.0 |
Regulatory liabilities |  |  |  |  |  |  |  | 2,275.0 | 2,363.0 |  |
CECONY | Net Unbilled Revenue Deferrals |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  |  | 199.0 | $ 117.0 |  |
CECONY | Electric | Hurricane |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 209 |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 134.0 |  |  |
Operation and maintenance expenses |  |  |  |  |  |  |  | 15.0 |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  |  |  | 84.0 |  |  |
Capital expenditures |  |  |  |  |  |  |  | 29.0 |  |  |
Removal costs |  |  |  |  |  |  |  | 6.0 |  |  |
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period |  |  |  |  |  |  |  |  |  |  | 3 years
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 377.0
CECONY | Electric | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 1,663.0
CECONY | Electric | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period |  |  |  |  |  |  |  |  |  |  | 5 years
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 784.0
CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period |  |  |  |  |  |  |  |  |  |  | 2 years
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 63.0
CECONY | Gas | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 725.0
CECONY | Gas | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period |  |  |  |  |  |  |  |  |  |  | 5 years
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 107.0
CECONY | NYSPSC | Steam |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period |  |  |  |  |  | 3 years |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | $ 15.0 |  | 185.0 |  |  |
CECONY | NYSPSC | Electric |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed EAM (percent) |  | 1.00% |  |  |  |  |  |  |  |  |
CECONY | NYSPSC | Gas |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed EAM (percent) |  | 0.70% |  |  |  |  |  |  |  |  |
O&R | Electric | Hurricane |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 93 |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 43.0 |  |  |
O&R | Electric and Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period |  |  |  |  |  |  |  |  |  |  | 3 years
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 22.0
O&R | Electric and Gas | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 123.0
O&R | Electric and Gas | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period |  |  |  |  |  |  |  |  |  |  | 15 years
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 30.0
Manhattan | CECONY | Electric |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer | 72 |  |  |  |  |  |  |  |  |  |
Cumulative catch-up adjustment to revenue, modification of contract | $ (5.0) |  |  |  |  |  |  |  |  |  |
Brooklyn | CECONY | Electric |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative catch-up adjustment to revenue, modification of contract | $ (10.0) |  |  |  |  |  |  |  |  |  |
Manhattan Steam Main Rupture | CECONY | NYSPSC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property damage, clean up and response costs |  |  |  |  |  |  |  | 17.0 |  |  |
Capital and retirement costs |  |  |  |  |  |  |  | 9.0 |  |  |
Violations Of Gas Operator Qualification, Performance, And Inspection Requirements | CECONY | NYSPSC | Gas |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  | $ 10.0 |  |  |

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