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Employee Retirement Benefits
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Employee Retirement Benefits
EMPLOYEE RETIREMENT BENEFITS
 
The following summarizes the components of net periodic costs for our qualified and supplemental pension plans:

(In millions)
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2013
 
2012
 
2013
 
2012
Service cost
 
$
3

 
$
3

 
$
6

 
$
6

Interest cost
 
3

 
4

 
6

 
7

Expected return on plan assets
 
(4
)
 
(4
)
 
(8
)
 
(8
)
Amortization of actuarial loss and prior service cost
 
3

 
1

 
5

 
3

Net periodic benefit cost
 
$
5

 
$
4

 
$
9

 
$
8



See our 2012 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 130, for information on our retirement benefits. We made matching contributions of $2 million and $3 million to our 401(k) and Top Hat savings plans during the second quarter of 2013 and 2012 and contributions of $5 million for the first six months of 2013 and 2012, respectively.

We contributed $15 million to our qualified pension plan during the first quarter of 2013. We do not anticipate further contributions to our qualified pension plan during the remainder of 2013.