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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of components of net periodic pension benefit (income) expense and post-retirement benefit expense
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