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Summary of Significant Accounting Policies and Other Matters - Capitalized Cost of Utility Plant (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 3,880 | $ 3,562
Held for future use | 92 | 75
Construction work in progress | 2,474 | 1,937
NET UTILITY PLANT | 42,024 | 39,751
Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 572 | 591
Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 3,786 | 3,634
Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 21,481 | 20,676
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 52 | 43
Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 9,206 | 8,617
Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,854 | 1,813
General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 2,507 | 2,365
CECONY |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 3,585 | 3,271
Held for future use | 84 | 67
Construction work in progress | 2,320 | 1,812
NET UTILITY PLANT | 39,552 | 37,412
CECONY | Electric Generation |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Generation | 572 | 591
CECONY | Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Transmission | 3,496 | 3,380
CECONY | Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 20,366 | 19,602
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | 52 | 43
CECONY | Gas |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gas | 8,522 | 7,961
CECONY | Steam |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Steam | 1,854 | 1,813
CECONY | General |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
General | $ 2,286 | $ 2,143

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