Other Postretirement Benefits - Schedule of Actuarial Assumptions (Details) - Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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)	5.35%	2.75%	2.25%
Discount rate, net periodic benefit cost (percent)	2.75%	2.25%	3.10%
O&R
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligations (percent)	5.45%	3.00%	2.55%
Discount rate, net periodic benefit cost (percent)	3.00%	2.55%	3.35%