Other Postretirement Benefits - Schedule of Actuarial Assumptions (Details) - Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Expected Return on Plan Assets	6.80%	7.50%	7.50%
CECONY
Defined Benefit Plan Disclosure [Line Items]
Discount Rate, Benefit Obligations	3.10%	4.15%	3.55%
Discount Rate, Net Periodic Benefit Cost	4.15%	3.55%	4.00%
O&R
Defined Benefit Plan Disclosure [Line Items]
Discount Rate, Benefit Obligations	3.35%	4.30%	3.70%
Discount Rate, Net Periodic Benefit Cost	4.30%	3.70%	4.20%