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Income Taxes (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
 
 
2014
 
2013
 
2014
 
2013
Tax at statutory rate
 
$
91

 
35.0
 %
 
$
64

 
35.0
 %
 
$
170

 
35.0
 %
 
$
191

 
35.0
 %
  Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(9
)
 
(3.5
)
 
(8
)
 
(4.4
)
 
(25
)
 
(5.2
)
 
(24
)
 
(4.4
)
Dividend received exclusion
 
(7
)
 
(2.7
)
 
(6
)
 
(3.3
)
 
(21
)
 
(4.3
)
 
(18
)
 
(3.3
)
Other
 
1

 
0.5

 
1

 
0.7

 
3

 
0.7

 
3

 
0.5

Provision for income taxes
 
$
76

 
29.3
 %
 
$
51

 
28.0
 %
 
$
127

 
26.2
 %
 
$
152

 
27.8
 %