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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Employee Benefit Plans [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
2013
 
2012
Dividend yield
1.28
%
 
0.91
%
Expected stock price volatility
30.98

 
39.88

Risk-free interest rate (weighted average)
1.02

 
1.07

Expected life of options
6 years

 
6 years
Stock-Based Compensation Expense Recognized in Noninterest Expense
 
Three Months Ended September 30
 
Nine Months Ended September 30
(Dollars in millions)
2013
 
2012
 
2013
 
2012
Stock-based compensation expense:
 
 
 
 
 
 
 
Stock options

$1

 

$2

 

$5

 

$9

Restricted stock
9

 
8

 
24

 
22

RSUs
2

 
6

 
15

 
24

Total stock-based compensation expense

$12

 

$16

 

$44

 

$55
Schedule of Net Benefit Costs [Table Text Block]
 
Three Months Ended September 30
 
2013
 
2012
(Dollars in millions)
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
Interest cost

$28

 

$1

 

$30

 

$2

Expected return on plan assets
(46
)
 
(1
)
 
(43
)
 
(2
)
Recognized net actuarial loss
6

 
—

 
6

 
—

Settlement loss
—

 
—

 
2

1 
—

Net periodic benefit

($12
)
 

$—

 

($5
)
 

$—

    
 
Nine Months Ended September 30
 
2013
 
2012
(Dollars in millions)
Pension Benefits
 
Other Postretirement Benefits
 
Pension Benefits
 
Other Postretirement Benefits
Interest cost

$84

 

$4

 

$90

 

$5

Expected return on plan assets
(139
)
 
(4
)
 
(129
)
 
(5
)
Recognized net actuarial loss
19

 
—

 
18

 
—

Settlement loss
—

 
—

 
2

1 
—

Net periodic benefit

($36
)
 

$—

 

($19
)
 

$—