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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2015
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 federal income tax rate and our effective income tax rate were as follows:
(Dollars in millions)
 
Three months ended March 31,
 
 
2015
 
2014
Tax at statutory rate:
 
$
61

 
35.0
 %
 
$
42

 
35.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(8
)
 
(4.6
)
 
(8
)
 
(6.7
)
Dividend received exclusion
 
(8
)
 
(4.6
)
 
(7
)
 
(5.9
)
Other
 
1

 
0.6

 
1

 
1.1

Provision for income taxes
 
$
46

 
26.4
 %
 
$
28

 
23.5
 %