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Income Taxes (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
 
 
2016
 
2015
 
2016
 
2015
Tax at statutory rate:
 
$
88

 
35.0
 %
 
$
85

 
35.0
 %
 
$
239

 
35.0
 %
 
$
233

 
35.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(8
)
 
(3.2
)
 
(9
)
 
(3.7
)
 
(25
)
 
(3.7
)
 
(25
)
 
(3.8
)
Dividend received exclusion
 
(8
)
 
(3.2
)
 
(8
)
 
(3.3
)
 
(24
)
 
(3.5
)
 
(23
)
 
(3.5
)
Other
 
1

 
0.3

 
1

 
0.4

 
3

 
0.4

 
2

 
0.4

Provision for income taxes
 
$
73

 
28.9
 %
 
$
69

 
28.4
 %
 
$
193

 
28.2
 %
 
$
187

 
28.1
 %