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Summary of Significant Accounting Policies and Other Matters - Capitalized Cost of Utility Plant (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 4,835 | $ 4,205
Held for future use | 118 | 117
Construction work in progress | 2,442 | 2,484
NET UTILITY PLANT | 49,594 | 46,752
Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 580 | 534
Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 4,652 | 4,223
Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 24,491 | 23,345
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 141 | 113
Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 12,023 | 11,326
Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,990 | 1,962
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 3,158 | 2,648
CECONY |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 4,530 | 3,879
Held for future use | 110 | 109
Construction work in progress | 2,168 | 2,268
NET UTILITY PLANT | 46,646 | 44,009
CECONY | Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 580 | 534
CECONY | Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 4,333 | 3,916
CECONY | Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 23,238 | 22,130
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 141 | 113
CECONY | Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 11,226 | 10,567
CECONY | Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,990 | 1,962
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 2,860 | $ 2,410

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- Definition Discloses the period end amount of plants held for future use and whether such amount is included in the utility's rate base. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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