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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
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,
 
 
2017
 
2016
 
2017
 
2016
Tax at statutory rate:
 
$
44

 
35.0
 %
 
$
58

 
35.0
 %
 
$
141

 
35.0
 %
 
$
151

 
35.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(9
)
 
(7.0
)
 
(8
)
 
(4.8
)
 
(18
)
 
(4.5
)
 
(17
)
 
(3.9
)
Dividend received exclusion
 
(9
)
 
(7.0
)
 
(8
)
 
(4.8
)
 
(17
)
 
(4.2
)
 
(16
)
 
(3.7
)
Other
 
2

 
0.9

 
1

 
0.5

 
(3
)
 
(0.8
)
 
2

 
0.4

Provision for income taxes
 
$
28

 
21.9
 %
 
$
43

 
25.9
 %
 
$
103

 
25.5
 %
 
$
120

 
27.8
 %