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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 5,444.0 | $ 5,328.0
Regulatory liabilities—current | 102.0 | 145.0
Total Regulatory Liabilities | 5,546.0 | 5,473.0
Regulatory assets | 5,523.0 | 4,607.0
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,224.0 | 1,535.0
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,527.0 | 1,456.0
Unrecognized pension and other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,054.0 | 943.0
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 368.0 | 284.0
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 436.0 | 278.0
Late payment charge deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 231.0 | 167.0
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 115.0 | 92.0
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 8.0 | 49.0
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 25.0 | 48.0
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10.0 | 11.0
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 446.0 | 465.0
Deferred derivative gains - short term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 25.0 | 74.0
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 59.0 | 71.0
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 18.0 | 0.0
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,940.0 | 4,818.0
Regulatory liabilities—current | 40.0 | 107.0
Regulatory assets | 5,158.0 | 4,314.0
CECONY | Arrears Relief Program Deferral [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory assets | 323.7 | 398.6
CECONY | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,940.0 | 4,818.0
Regulatory liabilities—current | 40.0 | 107.0
Total Regulatory Liabilities | 4,980.0 | 4,925.0
Regulatory assets | 5,158.0 | 4,314.0
CECONY | Future income tax | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,112.0 | 1,404.0
CECONY | Allowance for cost of removal less salvage | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,322.0 | 1,266.0
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 984.0 | 867.0
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 304.0 | 233.0
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 436.0 | 278.0
CECONY | Late payment charge deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 224.0 | 161.0
CECONY | System benefit charge carrying charge | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 110.0 | 88.0
CECONY | Deferred derivative gains - long term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 6.0 | 49.0
CECONY | Net proceeds from sale of property | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 24.0 | 47.0
CECONY | Settlement of prudence proceeding | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10.0 | 11.0
CECONY | Other | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 408.0 | 414.0
CECONY | Deferred derivative gains - short term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 22.0 | 71.0
CECONY | Refundable energy costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 18.0 | 36.0
CECONY | Revenue decoupling mechanism | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 0.0 | 0.0
O&R | Arrears Relief Program Deferral [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory assets | $ 1.4 | $ 2.1

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