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Income Taxes (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
 
 
2013
 
2012
 
2013
 
2012
Tax at statutory rate
 
$
52

 
35.0
 %
 
$
10

 
35.0
 %
 
$
128

 
35.0
 %
 
$
49

 
35.0
 %
  Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(9
)
 
(6.1
)
 
(8
)
 
(27.6
)
 
(16
)
 
(4.4
)
 
(17
)
 
(12.1
)
Dividend received exclusion
 
(6
)
 
(4.2
)
 
(6
)
 
(20.7
)
 
(12
)
 
(3.3
)
 
(11
)
 
(7.8
)
Other
 
1

 
1.0

 
1

 
3.0

 
1

 
0.4

 
2

 
1.2

Provision (benefit) for income taxes
 
$
38

 
25.7
 %
 
$
(3
)
 
(10.3
)%
 
$
101

 
27.7
 %
 
$
23

 
16.3
 %