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Employee Retirement Benefits
 6 Months Ended
Jun. 30, 2017
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 June 30,
 
Six months ended June 30,
 
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
2

 
$
2

 
$
5

 
$
5

Interest cost
 
4

 
4

 
7

 
7

Expected return on plan assets
 
(5
)
 
(4
)
 
(10
)
 
(9
)
Amortization of actuarial loss and prior service cost
 
—

 
1

 
1

 
2

Net periodic benefit cost
 
$
1

 
$
3

 
$
3

 
$
5

 
 
 
 
 
 
 
 
 


See our 2016 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 155, for information on our retirement benefits. We made matching contributions totaling $3 million and $4 million to our 401(k) and Top Hat savings plans during the second quarter of 2017 and 2016 and contributions of $9 million and $8 million for the first half of 2017 and 2016, respectively.

We contributed $5 million to our qualified pension plan during the first six months of 2017.