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Summary of Significant Accounting Policies and Other Matters - Capitalized Cost of Utility Plant (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 4,851 | $ 4,835
Held for future use | 77 | 118
Construction work in progress | 3,165 | 2,442
NET UTILITY PLANT | 52,152 | 49,594
Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 577 | 580
Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 5,072 | 4,652
Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 25,129 | 24,491
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 174 | 141
Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 12,703 | 12,023
Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 2,006 | 1,990
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 3,249 | 3,158
CECONY |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 4,520 | 4,530
Held for future use | 69 | 110
Construction work in progress | 2,912 | 2,168
NET UTILITY PLANT | 48,981 | 46,646
CECONY | Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 577 | 580
CECONY | Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 4,703 | 4,333
CECONY | Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 23,770 | 23,238
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 174 | 141
CECONY | Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 11,830 | 11,226
CECONY | Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 2,006 | 1,990
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 2,940 | $ 2,860

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