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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
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 June 30,
 
Six months ended June 30,
 
 
2016
 
2015
 
2016
 
2015
Tax at statutory rate:
 
$
58

 
35.0
 %
 
$
87

 
35.0
 %
 
$
151

 
35.0
 %
 
$
148

 
35.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(8
)
 
(4.8
)
 
(8
)
 
(3.2
)
 
(17
)
 
(3.9
)
 
(16
)
 
(3.8
)
Dividend received exclusion
 
(8
)
 
(4.8
)
 
(7
)
 
(2.8
)
 
(16
)
 
(3.7
)
 
(15
)
 
(3.6
)
Other
 
1

 
0.5

 
0

 
0.0

 
2

 
0.4

 
1

 
0.4

Provision for income taxes
 
$
43

 
25.9
 %
 
$
72

 
29.0
 %
 
$
120

 
27.8
 %
 
$
118

 
28.0
 %