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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Differences Between The 35 Percent Statutory Income Tax Rate And Effective Income Tax Rate
The differences between the 35 percent statutory income tax rate and our effective income tax rate were as follows:
 
(Dollars in millions)
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2013
 
2012
 
2013
 
2012
Tax at statutory rate
 
$
64

 
35.0
 %
 
$
53

 
35.0
 %
 
$
191

 
35.0
 %
 
$
103

 
35.0
 %
  Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(8
)
 
(4.4
)
 
(8
)
 
(5.3
)
 
(24
)
 
(4.4
)
 
(25
)
 
(8.5
)
Dividend received exclusion
 
(6
)
 
(3.3
)
 
(6
)
 
(4.0
)
 
(18
)
 
(3.3
)
 
(17
)
 
(5.8
)
Other
 
1

 
0.7

 
2

 
1.3

 
3

 
0.5

 
3

 
1.1

Provision for income taxes
 
$
51

 
28.0
 %
 
$
41

 
27.0
 %
 
$
152

 
27.8
 %
 
$
64

 
21.8
 %