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Employee Retirement Benefits
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Retirement Benefits
Employee Retirement Benefits
The following summarizes the components of net periodic benefit cost for our qualified and supplemental pension plans:
(Dollars in millions)
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
3

 
$
3

 
$
9

 
$
8

Interest cost
 
3

 
4

 
10

 
11

Expected return on plan assets
 
(4
)
 
(5
)
 
(13
)
 
(13
)
Amortization of actuarial loss and prior service
  cost
 
1

 
1

 
4

 
2

Net periodic benefit cost
 
$
3

 
$
3

 
$
10

 
$
8

 
 
 
 
 
 
 
 
 


See our 2014 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 148, for information on our retirement benefits. We made matching contributions totaling $2 million and $3 million to our
401(k) and Top Hat savings plans during the third quarter of 2015 and 2014 and contributions of $9 million during both the first nine months of 2015 and 2014, respectively.

We contributed $5 million to our qualified pension plan during the first quarter of 2015. We do not anticipate further contributions to our qualified pension plan during the remainder of 2015.