Revenue Recognition - Additional information (Details) - USD ($) $ in Millions	3 Months Ended	13 Months Ended
	Mar. 31, 2021	Jan. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Late fee and other fees not collected	$ 18
CECONY | Subsidiaries
Disaggregation of Revenue [Line Items]
Late fee and other fees not collected	$ 17
CECONY | COVID-19 | Subsidiaries | Scenario, Forecast | Electric
Disaggregation of Revenue [Line Items]
Late payment charges and fees		$ 19	$ 43
CECONY | COVID-19 | Subsidiaries | Scenario, Forecast | Gas
Disaggregation of Revenue [Line Items]
Late payment charges and fees		$ 4	$ 7