Pension Benefits - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	$ 31
Contributions	25
CECONY | Pension Benefits | Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	18
Contributions	13
CECONY | External Trust | Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 17