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Employee Benefits
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Employee Benefits
Employee Benefits
Net periodic (income) expense for our qualified and non-qualified pension plans included the following components:
 
Pension Plans
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(Dollars in millions)
Service cost
$
19

 
23

 
39

 
48

Interest cost
151

 
135

 
302

 
270

Expected return on plan assets
(223
)
 
(224
)
 
(446
)
 
(448
)
Recognition of prior service cost
3

 
1

 
4

 
2

Recognition of actuarial loss
5

 
20

 
10

 
40

Net periodic pension benefit income
$
(45
)
 
(45
)
 
(91
)
 
(88
)

Net periodic expense (income) for our post-retirement benefit plans included the following components:
 
Post-Retirement Benefit Plans
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(Dollars in millions)
Service cost
$
5

 
6

 
11

 
12

Interest cost
40

 
35

 
79

 
70

Expected return on plan assets
(8
)
 
(10
)
 
(16
)
 
(20
)
Recognition of prior service cost
5

 
—

 
9

 
—

Recognition of actuarial loss
—

 
1

 
—

 
2

Net periodic post-retirement benefit expense
$
42

 
32

 
83

 
64


We report net periodic benefit (income) expense for our qualified pension, non-qualified pension and post-retirement benefit plans in cost of services and products and selling, general and administrative expenses on our consolidated statements of operations.