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Employee Retirement Benefits
 3 Months Ended
Mar. 31, 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 March 31,
 
 
2015
 
2014
Service cost
 
$
3

 
$
2

Interest cost
 
3

 
4

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

 
1

Net periodic benefit cost
 
$
3

 
$
3

 
 
 
 
 


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 $4 million to our 401(k) and Top Hat savings plans during both the first quarters of 2015 and 2014.

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.