Other Postretirement Benefits - Schedule of Actuarial Assumptions (Details) - Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Expected Return on Plan Assets	7.00%	7.75%	7.75%
CECONY
Defined Benefit Plan Disclosure [Line Items]
Discount Rate, Benefit Obligations	4.00%	4.05%	3.75%
Discount Rate, Net Periodic Benefit Cost	4.05%	3.75%	4.50%
O&R
Defined Benefit Plan Disclosure [Line Items]
Discount Rate, Benefit Obligations	4.20%	4.20%	3.85%
Discount Rate, Net Periodic Benefit Cost	4.20%	3.85%	4.75%