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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 4,946 | $ 5,444
Regulatory liabilities – current | 123 | 102
Total Regulatory Liabilities | 5,069 | 5,546
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,597 | 1,527
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,146 | 1,224
Unrecognized pension and other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 736 | 1,054
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 373 | 368
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 296 | 436
Late payment charge deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 223 | 231
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 103 | 115
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 16 | 8
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 9 | 10
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 447 | 471
Deferred derivative gains - short term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 22 | 25
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 84 | 59
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 17 | 18
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,466 | 4,940
Regulatory liabilities – current | 73 | 40
CECONY | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,466 | 4,940
Regulatory liabilities – current | 73 | 40
Total Regulatory Liabilities | 4,539 | 4,980
CECONY | Allowance for cost of removal less salvage | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,383 | 1,322
CECONY | Future income tax | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,039 | 1,112
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 684 | 984
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 324 | 304
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 296 | 436
CECONY | Late payment charge deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 219 | 224
CECONY | System benefit charge carrying charge | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 96 | 110
CECONY | Deferred derivative gains - long term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 12 | 6
CECONY | Settlement of prudence proceeding | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 9 | 10
CECONY | Other | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 404 | 432
CECONY | Deferred derivative gains - short term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 18 | 22
CECONY | Refundable energy costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 55 | 18
CECONY | Revenue decoupling mechanism | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | $ 0 | $ 0

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