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Employee Benefits
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in millions)
Service cost
$
16

 
20

 
48

 
62

Interest cost
107

 
142

 
321

 
425

Expected return on plan assets
(183
)
 
(224
)
 
(550
)
 
(673
)
Recognition of prior service (credit) cost
(2
)
 
1

 
(6
)
 
4

Recognition of actuarial loss
44

 
40

 
131

 
120

Net periodic pension benefit income
$
(18
)
 
(21
)
 
(56
)
 
(62
)

Net periodic expense (income) for our post-retirement benefit plans included the following components:
 
Post-Retirement Benefit Plans
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(Dollars in millions)
Service cost
$
4

 
6

 
14

 
18

Interest cost
29

 
35

 
84

 
105

Expected return on plan assets
(2
)
 
(6
)
 
(6
)
 
(16
)
Recognition of prior service cost
5

 
6

 
15

 
16

Net periodic post-retirement benefit expense
$
36

 
41

 
107

 
123


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.
Benefits paid by our qualified pension plan are paid through a trust that holds all plan assets. Based on current laws and circumstances, we do not expect any contributions to be required for our qualified pension plan during the remainder of 2016. However, we made a voluntary contribution to the trust of $100 million during the third quarter of 2016.