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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Differences Between The 35 Percent Statutory Income Tax Rate And Effective Income Tax Rate
The differences between the 21 percent and 35 percent statutory federal income tax rates and our effective income tax rate were as follows:
(Dollars in millions)
 
Three months ended March 31,
 
 
2018
 
2017
Tax at statutory rate:
 
$
(11
)
 
21.0
%
 
$
97

 
35.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(5
)
 
10.0

 
(9
)
 
(3.3
)
Dividend received exclusion
 
(3
)
 
6.0

 
(8
)
 
(2.9
)
Other
 
—

 
1.0

 
(5
)
 
(1.6
)
Provision for income taxes
 
$
(19
)
 
38.0
%
 
$
75

 
27.2
 %