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Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of cost of pension plans
The cost of our pension plans are as follows:
 
 
 
Erie Insurance Group
(in millions)
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Service cost for benefits earned
 
$
7

 
$
5

 
$
15

 
$
11

Interest cost on benefits obligation
 
7

 
7

 
15

 
14

Expected return on plan assets
 
(9
)
 
(8
)
 
(18
)
 
(16
)
Prior service cost amortization
 
1

 
1

 
1

 
1

Net actuarial loss amortization
 
4

 
1

 
7

 
3

Pension plan cost (1)
 
$
10

 
$
6

 
$
20

 
$
13

 
(1)
Pension plan costs represent the total cost for the Erie Insurance Group before reimbursements to Indemnity from the Exchange and EFL.