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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Differences Between Statutory Income Tax Rate And Effective Income Tax Rate
The differences between the 21% 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,
 
 
2019
 
2018
 
2019
 
2018
Tax at statutory rate:
 
$
111

 
21.0
 %
 
$
56

 
21.0
 %
 
$
293

 
21.0
 %
 
$
45

 
21.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(4
)
 
(0.8
)
 
(5
)
 
(1.9
)
 
(9
)
 
(0.6
)
 
(10
)
 
(4.7
)
Dividend received exclusion
 
(4
)
 
(0.8
)
 
(5
)
 
(1.5
)
 
(8
)
 
(0.6
)
 
(8
)
 
(3.7
)
Other
 
(1
)
 
(0.2
)
 
1

 
0.2

 
(2
)
 
(0.2
)
 
1

 
0.5

Provision for income taxes
 
$
102

 
19.2
 %
 
$
47

 
17.8
 %
 
$
274

 
19.6
 %
 
$
28

 
13.1
 %