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Revenue Recognition - Additional information (Details) - CECONY - NYSPSC - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Amount of cost recovery | $ 43 | $ 19 | $ 43
Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Amount of cost recovery | $ 7 | $ 4 | $ 7

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