Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Total Periodic Benefit Costs

The components of the Companies’ total periodic benefit costs for the three months ended March 31, 2018 and 2017 were as follows:

	For the Three Months Ended March 31,
	Con Edison		CECONY
(Millions of Dollars)	2018	2017	2018	2017
Service cost – including administrative expenses	$72	$66	$68	$61
Interest cost on projected benefit obligation	140	148	131	139
Expected return on plan assets	(258)	(243)	(245)	(229)
Recognition of net actuarial loss	172	149	163	141
Recognition of prior service costs	(4)	(4)	(5)	(5)
TOTAL PERIODIC BENEFIT COST	$122	$116	$112	$107
Cost capitalized	(31)	(43)	(29)	(41)
Reconciliation to rate level	(23)	(11)	(25)	(12)
Cost charged to operating expenses	$68	$62	$58	$54

The components of the Companies’ total periodic other postretirement benefit costs for the three months ended March 31, 2018 and 2017 were as follows:

	For the Three Months Ended March 31,
	Con Edison		CECONY
(Millions of Dollars)	2018	2017	2018	2017
Service cost	$5	$5	$3	$3
Interest cost on accumulated other postretirement benefit obligation	11	11	9	10
Expected return on plan assets	(18)	(17)	(16)	(15)
Recognition of net actuarial loss	2	1	1	(1)
Recognition of prior service cost	(2)	(4)	(1)	(3)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST	$(2)	$(4)	$(4)	$(6)
Cost capitalized	(2)	2	(2)	2
Reconciliation to rate level	2	(1)	3	—
Cost charged to operating expenses	$(2)	$(3)	$(3)	$(4)