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Employee Retirement Benefits
 9 Months Ended
Sep. 30, 2016
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,
 
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
3

 
$
3

 
$
8

 
$
9

Interest cost
 
4

 
3

 
11

 
10

Expected return on plan assets
 
(5
)
 
(4
)
 
(14
)
 
(13
)
Amortization of actuarial loss and prior service
 cost
 
0

 
1

 
2

 
4

Net periodic benefit cost
 
$
2

 
$
3

 
$
7

 
$
10

 
 
 
 
 
 
 
 
 


See our 2015 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 146, for information on our retirement benefits. We made matching contributions totaling $3 million and $2 million to our
401(k) and Top Hat savings plans during the third quarter of 2016 and 2015, respectively, and contributions of
$11 million and $9 million for the first nine months of 2016 and 2015, respectively.

We contributed $13 million to our qualified pension plan during the first nine months of 2016. We do not anticipate further contributions during the remainder of 2016.