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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Employee Benefit Plans [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
Three Months Ended June 30
 
Six Months Ended June 30
(Dollars in millions)
2016
 
2015
 
2016
 
2015
Restricted stock

$—

 

$4

 

$2

 

$9

Performance stock units
17

 
9

 
24

 
17

RSUs
12

 
10

 
30

 
28

Total stock-based compensation

$29

 

$23

 

$56

 

$54

 
 
 
 
 
 
 
 
Stock-based compensation tax benefit

$11

 

$9

 

$21

 

$21
Schedule of Net Benefit Costs [Table Text Block]
 
Pension Benefits 1
 
Other Postretirement Benefits
 
Three Months Ended June 30
 
Six Months Ended June 30
 
Three Months Ended June 30
 
Six Months Ended June 30
(Dollars in millions)
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost

$1

 

$1

 

$3

 

$2

 

$—

 

$—

 

$—

 

$—

Interest cost
24

 
29

 
49

 
58

 
—

 
1

 
1

 
1

Expected return on plan assets
(46
)
 
(52
)
 
(93
)
 
(103
)
 
(1
)
 
(1
)
 
(2
)
 
(2
)
Amortization of prior service credit
—

 
—

 
—

 
—

 
(1
)
 
(2
)
 
(3
)
 
(3
)
Amortization of actuarial loss
6

 
6

 
12

 
11

 
—

 
—

 
—

 
—

Net periodic benefit

($15
)
 

($16
)
 

($29
)
 

($32
)
 

($2
)
 

($2
)
 

($4
)
 

($4
)

1 Administrative fees are recognized in service cost for each of the periods presented.