Other Postretirement Benefits - Schedule of Actuarial Assumptions (Details) - Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets (percent)	6.80%	6.80%	6.80%
CECONY
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligations (percent)	5.05%	5.35%	2.75%
Discount rate, net periodic benefit cost (percent)	5.35%	2.75%	2.25%
O&R
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligations (percent)	5.15%	5.45%	3.00%
Discount rate, net periodic benefit cost (percent)	5.45%	3.00%	2.55%