Revenue Recognition - Additional information (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Apr. 30, 2022	Nov. 30, 2021	Dec. 31, 2020	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Remaining performance obligation				$ 89
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation				51
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation				$ 38
CECONY | Electric | NYSPSC
Disaggregation of Revenue [Line Items]
Amount of cost recovery		$ 43	$ 43
CECONY | Gas | NYSPSC
Disaggregation of Revenue [Line Items]
Amount of cost recovery		$ 7	$ 7
O&R | Electric and Gas Transmission Projects | Subsidiaries
Disaggregation of Revenue [Line Items]
Public utility, rate plan term (in years)	3 years