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Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Total Periodic Benefit Costs
The components of the Companies’ total periodic other postretirement benefit costs for the three months ended March 31, 2017 and 2016 were as follows:
 
 
For the Three Months Ended March 31,
  
          Con Edison
          CECONY
(Millions of Dollars)
2017
2016
2017

2016
Service cost
$5
$4
$3
$3
Interest cost on accumulated other postretirement benefit obligation
11
12
10
10
Expected return on plan assets
(17)
(19)
(15)
(17)
Recognition of net actuarial loss
1
1
(1)
1
Recognition of prior service cost
(4)
(5)
(3)
(4)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST
$(4)
$(7)
$(6)
$(7)
Cost capitalized
2
2
2
2
Reconciliation to rate level
(1)
7
—

7
Cost charged to operating expenses
$(3)
$2
$(4)
$2