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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2020
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 March 31,
 
 
2020
 
2019
Tax at statutory rate:
 
$
(331
)
 
21.0
%
 
$
182

 
21.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(5
)
 
0.3

 
(5
)
 
(0.6
)
Dividend received exclusion
 
(4
)
 
0.3

 
(4
)
 
(0.5
)
Other
 
(10
)
 
0.6

 
(1
)
 
(0.1
)
Provision (benefit) for income taxes
 
$
(350
)
 
22.2
%
 
$
172

 
19.8
 %