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Employee Benefits
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in millions)
Service cost
$
15

 
20

 
32

 
42

Interest cost
107

 
142

 
214

 
283

Expected return on plan assets
(183
)
 
(223
)
 
(367
)
 
(449
)
Recognition of prior service (credit) cost
(2
)
 
2

 
(4
)
 
3

Recognition of actuarial loss
45

 
42

 
87

 
80

Net periodic pension benefit income
$
(18
)
 
(17
)
 
(38
)
 
(41
)

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,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in millions)
Service cost
$
5

 
6

 
10

 
12

Interest cost
27

 
35

 
55

 
70

Expected return on plan assets
(2
)
 
(5
)
 
(4
)
 
(10
)
Recognition of prior service cost
5

 
5

 
10

 
10

Net periodic post-retirement benefit expense
$
35

 
41

 
71

 
82


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 in our consolidated statements of operations.