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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Components of Expense/(Income) Related to Net Benefit Expense
The following table describes the components of expense / (income) related to net benefit expense recorded in labor and fringe on the income statement.
 
Pension Benefits
(Dollars in millions)
Second Quarters
 
Six Months
 
2017
2016
 
2017
2016
Service Cost
$
9

$
12

 
$
20

$
24

Interest Cost
23

30

 
46

60

Expected Return on Plan Assets
(43
)
(40
)
 
(85
)
(79
)
Amortization of Net Loss
10

12

 
21

24

Net Periodic Benefit Cost
$
(1
)
$
14

 
$
2

$
29

Special Termination Benefits - Management Workforce Reduction/Curtailment
7

—

 
57

—

Total Expense
$
6

$
14

 
$
59

$
29

 
 
 
 
 
 
 
Other Post-retirement Benefits
(Dollars in millions)
Second Quarters
 
Six Months
 
2017
2016
 
2017
2016
Service Cost
$
1

$
1

 
$
1

$
1

Interest Cost
2

3

 
4

6

Amortization of Net Loss
—

—

 
—

1

Net Periodic Benefit Cost
$
3

$
4

 
$
5

$
8

Special Termination Benefits - Management Workforce Reduction/Curtailment
—

—

 
13

—

Total Expense
$
3

$
4

 
$
18

$
8