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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
 
Nine months ended September 30,
 
 
2018
 
2017
 
2018
 
2017
Tax at statutory rate:
 
$
130

 
21.0
 %
 
$
46

 
35.0
 %
 
$
175

 
21.0
 %
 
$
187

 
35.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(5
)
 
(0.8
)
 
(9
)
 
(7.0
)
 
(15
)
 
(1.8
)
 
(27
)
 
(5.1
)
Dividend received exclusion
 
(3
)
 
(0.5
)
 
(8
)
 
(6.2
)
 
(11
)
 
(1.3
)
 
(25
)
 
(4.7
)
Tax accounting method changes
 
(50
)
 
(8.1
)
 
0

 
0.0

 
(50
)
 
(6.0
)
 
0

 
0.0

Other
 
(7
)
 
(1.1
)
 
(2
)
 
(0.9
)
 
(6
)
 
(0.7
)
 
(5
)
 
(0.8
)
Provision for income taxes
 
$
65

 
10.5
 %
 
$
27

 
20.9
 %
 
$
93

 
11.2
 %
 
$
130

 
24.4
 %