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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
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,
 
   
2011
   
2010
   
2011
   
2010
 
Tax at statutory rate
  $ 4       35.0 %   $ 77       35.0 %   $ (4 )     35.0 %   $ 114       35.0 %
Increase (decrease) resulting from:
                                                               
Tax-exempt income from municipal bonds
    (9 )     (81.2 )     (9 )     (4.1 )     (26 )     254.7       (27 )     (8.3 )
Dividend received exclusion
    (5 )     (44.5 )     (5 )     (2.1 )     (15 )     144.8       (14 )     (4.2 )
Other
    2       18.0       2       0.6       3       (14.5 )     3       0.7  
Effective tax
  $ (8 )     (72.7 )%   $ 65       29.4 %   $ (42 )     420.0 %   $ 76       23.2 %