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Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | $ 5,037 | $ 5,328
Regulatory liabilities – current | 143 | 145
Total Regulatory Liabilities | 5,180 | 5,473
Regulatory assets | 5,317 | 4,607
Regulatory assets | 224 | 281
Allowance for cost of removal less salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,470 | 1,456
Future income tax |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,324 | 1,535
Unrecognized pension and other postretirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 787 | 943
Pension and other postretirement benefit deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 370 | 284
Net unbilled revenue deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 260 | 278
Late payment charge deferral |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 227 | 167
System benefit charge carrying charge |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 111 | 92
Net proceeds from sale of property |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 31 | 48
Deferred derivative gains - long term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 19 | 49
Settlement of prudence proceeding |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 11
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 428 | 465
Refundable energy costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 81 | 71
Revenue decoupling mechanism |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 33 | 0
Deferred derivative gains - short term |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 29 | 74
CECONY |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,561 | 4,818
Regulatory liabilities – current | 71 | 107
Regulatory assets | 4,971 | 4,314
Regulatory assets | 193 | 254
CECONY | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 4,561 | 4,818
Regulatory liabilities – current | 71 | 107
Total Regulatory Liabilities | 4,632 | 4,925
Regulatory assets | 4,971 | 4,314
Regulatory assets | 193 | 254
CECONY | Allowance for cost of removal less salvage | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,269 | 1,266
CECONY | Future income tax | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 1,209 | 1,404
CECONY | Unrecognized pension and other postretirement costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 739 | 867
CECONY | Pension and other postretirement benefit deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 312 | 233
CECONY | Net unbilled revenue deferrals | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 260 | 278
CECONY | Late payment charge deferral | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 221 | 161
CECONY | System benefit charge carrying charge | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 106 | 88
CECONY | Net proceeds from sale of property | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 30 | 47
CECONY | Deferred derivative gains - long term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 19 | 49
CECONY | Settlement of prudence proceeding | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 10 | 11
CECONY | Other | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – noncurrent | 386 | 414
CECONY | Refundable energy costs | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 43 | 36
CECONY | Revenue decoupling mechanism | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | 0 | 0
CECONY | Deferred derivative gains - short term | Subsidiaries |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities – current | $ 28 | $ 71

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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