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Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 13, 2019 customer | Mar. 31, 2018 customer | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  | $ 4,242 | $ 4,242 |  |  | $ 4,370 |  |
CECONY |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  | 3,900 | 3,900 |  |  | $ 3,987 |  |
CECONY | Electric | West Side of Manhattan |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer | 72 |  |  |  |  |  |  |  |
Revenues |  |  | 5 |  |  |  |  |  |
Accrued liabilities, power outages |  |  | 5 | 5 |  |  |  |  |
CECONY | Electric | Hurricane |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  | 209 |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | $ 134 |
Operation and maintenance expenses |  |  |  |  |  |  |  | 15 |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  |  |  | 84 |
Capital expenditures |  |  | $ 29 | 29 |  |  |  |  |
Removal costs |  |  |  |  |  |  |  | 6 |
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  | $ 377
Tax credit, amortization period |  |  |  |  |  |  |  |  | 3 years
O&R | Electric | Hurricane |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  | 93 |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 43 |
RECO | Electric | Hurricane |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  | 44 |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | $ 17 |
NYSPSC | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | $ 259 |  |  |
NYSPSC | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | 113 |  |  |
NYSPSC | CECONY | Steam |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  | $ 15 |  |  |  |
Tax credit, amortization period |  |  |  |  |  |  | 3 years |  |
Impact in regulatory liability resulting from TCJA |  |  |  | $ 185 |  |  |  |  |
NYSPSC | CECONY | Steam | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | $ 25 |  |  |

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