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Summary of Significant Accounting Policies and Other Matters - Capitalized Cost of Utility Plant (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 4,170 | $ 3,880
Held for future use | 80 | 92
Construction work in progress | 2,152 | 2,474
NET UTILITY PLANT | 44,214 | 42,024
Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 559 | 572
Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 3,955 | 3,786
Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 22,418 | 21,481
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 87 | 52
Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 10,473 | 9,206
Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,924 | 1,854
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 2,566 | 2,507
CECONY |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 3,854 | 3,585
Held for future use | 72 | 84
Construction work in progress | 1,985 | 2,320
NET UTILITY PLANT | 41,611 | 39,552
CECONY | Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 559 | 572
CECONY | Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 3,658 | 3,496
CECONY | Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 21,240 | 20,366
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 87 | 52
CECONY | Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 9,748 | 8,522
CECONY | Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,924 | 1,854
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 2,338 | $ 2,286

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