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Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 13, 2019 USD ($) customer | Sep. 30, 2020 USD ($) | Aug. 31, 2020 USD ($) customer | Apr. 30, 2020 USD ($) | Mar. 31, 2018 customer | Mar. 31, 2020 USD ($) | Mar. 31, 2019 | Sep. 30, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
CECONY | NYSPSC | Manhattan Steam Main Rupture |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property damage, clean up and response expense |  |  |  |  |  |  |  | $ 17,000 |  |  |  |
Capital and retirement costs |  |  |  |  |  |  |  | 9,000 |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  | $ 3,000 |
CECONY | NYSPSC | Steam |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | $ 185,000 |  |  | $ 15,000 |  |  |
Tax credit, amortization period |  |  |  |  |  |  | 3 years |  |  |  |  |
CECONY | Electric |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues, negative adjustment |  | $ 5,000 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | West Side of Manhattan |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer | 72 |  |  |  |  |  |  |  |  |  |  |
Revenues, negative adjustment | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Brooklyn |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues, negative adjustment | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Hurricane |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  |  | 209 |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  | 134,000 |  |  |  |  |  |
Operation and maintenance expenses |  |  |  |  |  | 15,000 |  |  |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  | 84,000 |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 29,000
Removal costs |  |  |  |  |  | 6,000 |  |  |  |  |  |
CECONY | Electric | Tropical Storm |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 330 |  |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 142,000 |  |  |  |
Operation and maintenance expenses |  |  |  |  |  |  |  | 13,000 |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  |  |  | 73,000 |  |  |  |
Capital expenditures |  | 56,000 |  |  |  |  |  | 56,000 |  |  |  |
Loss contingency accrual |  | 5,000 |  |  |  |  |  | 5,000 |  |  |  |
CECONY | Electric | NYSPSC | Hurricane |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  | 5,600 |
Settlement agreement, amount awarded for the benefit |  |  | $ 5,600 |  |  |  |  |  |  |  |  |
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 377,000 |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  | 3 years |  |
CECONY | Electric | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 1,663,000 |  |
CECONY | Electric | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  | 5 years |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 784,000 |  |
CECONY | Gas | NYSPSC | Violations of Gas Operator Qualification, Performance and Inspection Requirements |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  | 5,000 |  |  |  |  |  | $ 10,000
Settlement agreement, amount |  |  |  | $ 15,000 |  |  |  |  |  |  |  |
CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 63,000 |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  | 2 years |  |
CECONY | Gas | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 725,000 |  |
CECONY | Gas | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  | 5 years |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 107,000 |  |
O&R | Electric | Hurricane |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  |  | 93 |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  | 43,000 |  |  |  |  |  |
O&R | Electric | Tropical Storm |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 200 |  |  |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  |  |  | 30,000 |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  |  |  |  |  | 23,000 |  |  |  |
Capital expenditures |  | 7,000 |  |  |  |  |  | 7,000 |  |  |  |
Loss contingency accrual |  | $ 2,000 |  |  |  |  |  | $ 2,000 |  |  |  |
O&R | Electric | NYSPSC | Hurricane |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  | $ 850 |
Settlement agreement, amount awarded for the benefit |  |  | $ 850 |  |  |  |  |  |  |  |  |
O&R | Electric and Gas Transmission Projects | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 22,000 |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  | 3 years |  |
O&R | Electric and Gas Transmission Projects | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 123,000 |  |
O&R | Electric and Gas Transmission Projects | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  |  | 15 years |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  | $ 30,000 |  |
RECO | Electric | Hurricane |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  |  |  | 44 |  |  |  |  |  |  |
Restoration costs |  |  |  |  |  | $ 17,000 |  |  |  |  |  |

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