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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 5,328.0 | $ 6,027.0
Regulatory liabilities—current | 145.0 | 374.0
Total Regulatory Liabilities | 5,473.0 | 6,401.0
Regulatory assets | 4,607.0 | 3,974.0
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,535.0 | 1,753.0
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,456.0 | 1,315.0
Unrecognized pension and other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 943.0 | 1,638.0
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 284.0 | 144.0
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 278.0 | 204.0
2022 and 2023 late payment charge deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 167.0 | 127.0
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 92.0 | 73.0
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 49.0 | 145.0
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 48.0 | 69.0
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 11.0 | 10.0
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 465.0 | 549.0
Deferred derivative gains - short term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 74.0 | 311.0
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 71.0 | 34.0
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 0.0 | 29.0
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,818.0 | 5,481.0
Regulatory liabilities—current | 107.0 | 308.0
Regulatory assets | 4,314.0 | 3,669.0
CECONY | Arrears Relief Program Deferral [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory assets | 398.6 | 93.5
CECONY | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,818.0 | 5,481.0
Regulatory liabilities—current | 107.0 | 308.0
Total Regulatory Liabilities | 4,925.0 | 5,789.0
Regulatory assets | 4,314.0 | 3,669.0
CECONY | Future income tax | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,404.0 | 1,616.0
CECONY | Allowance for cost of removal less salvage | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,266.0 | 1,137.0
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 867.0 | 1,536.0
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 233.0 | 98.0
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 278.0 | 204.0
CECONY | 2022 and 2023 late payment charge deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 161.0 | 123.0
CECONY | System benefit charge carrying charge | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 88.0 | 69.0
CECONY | Deferred derivative gains - long term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 49.0 | 130.0
CECONY | Net proceeds from sale of property | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 47.0 | 69.0
CECONY | Settlement of prudence proceeding | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 11.0 | 10.0
CECONY | Other | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 414.0 | 489.0
CECONY | Deferred derivative gains - short term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 71.0 | 287.0
CECONY | Refundable energy costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 36.0 | 0.0
CECONY | Revenue decoupling mechanism | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities—current | 0.0 | 21.0
O&R | Arrears Relief Program Deferral [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory assets | $ 2.1 | $ 2.6

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