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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Employee Benefit Plans [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Dividend yield
1.28
%
Expected stock price volatility
30.98

Risk-free interest rate (weighted average)
1.02

Expected life of options
6 years
Stock-Based Compensation Expense Recognized in Noninterest Expense
 
Three Months Ended September 30
 
Nine Months Ended September 30
(Dollars in millions)
2014
 
2013
 
2014
 
2013
Stock-based compensation expense:
 
 
 
 
 
 
 
Stock options

$—

 

$1

 

$1

 

$5

Restricted stock
7

 
9

 
21

 
24

RSUs
5

 
2

 
27

 
15

Total stock-based compensation expense

$12

 

$12

 

$49

 

$44
Schedule of Net Benefit Costs [Table Text Block]
 
Three Months Ended September 30
 
2014
  
2013
(Dollars in millions)
Pension
  Benefits 1
 
Other Postretirement Benefits
 
Pension
  Benefits 1
 
Other Postretirement Benefits
Service cost

$2

 

$—

 

$2

 

$—

Interest cost/(credit)
31

 
(1
)
 
28

 
1

Expected return on plan assets
(50
)
 
(1
)
 
(48
)
 
(1
)
Recognized net actuarial loss
4

 
—

 
6

 
—

Net periodic benefit

($13
)
 

($2
)
 

($12
)
 

$—

 
Nine Months Ended September 30
 
2014
 
2013
(Dollars in millions)
Pension
  Benefits 1
 
Other Postretirement Benefits
 
Pension
  Benefits 1
 
Other Postretirement Benefits
Service cost

$4

 

$—

 

$4

 

$—

Interest cost
93

 
2

 
84

 
4

Expected return on plan assets
(150
)
 
(4
)
 
(143
)
 
(4
)
Amortization of prior service credit
—

 
(4
)
 
—

 
—

Recognized net actuarial loss
12

 
—

 
19

 
—

Net periodic benefit

($41
)
 

($6
)
 

($36
)
 

$—