Pension Benefits - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	$ 25
Contributions made by employer	10
CECONY | Pension Benefits | Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	22
Contributions made by employer	9
CECONY | External Trust | Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Contributions made by employer	$ 12