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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six months ended June 30,
 
 
2014
 
2013
 
2014
 
2013
Tax at statutory rate
 
$
37

 
35.0
 %
 
$
52

 
35.0
 %
 
$
79

 
35.0
 %
 
$
128

 
35.0
 %
  Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(8
)
 
(7.5
)
 
(9
)
 
(6.1
)
 
(16
)
 
(7.1
)
 
(16
)
 
(4.4
)
Dividend received exclusion
 
(7
)
 
(6.5
)
 
(6
)
 
(4.2
)
 
(14
)
 
(6.2
)
 
(12
)
 
(3.3
)
Other
 
1

 
0.5

 
1

 
1.0

 
2

 
0.9

 
1

 
0.4

Provision for income taxes
 
$
23

 
21.5
 %
 
$
38

 
25.7
 %
 
$
51

 
22.6
 %
 
$
101

 
27.7
 %