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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2014
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:
(In millions)
 
Three months ended March 31,
 
 
2014
 
2013
Tax at statutory rate
 
$
42

 
35.0
 %
 
$
76

 
35.0
 %
  Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(8
)
 
(6.7
)
 
(8
)
 
(3.7
)
Dividend received exclusion
 
(7
)
 
(5.9
)
 
(6
)
 
(2.6
)
Other
 
1

 
1.1

 
1

 
0.3

Provision for income taxes
 
$
28

 
23.5
 %
 
$
63

 
29.0
 %