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Income Taxes (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Tax at statutory rate:
 
$
62

 
21.0
 %
 
$
130

 
21.0
 %
 
$
355

 
21.0
 %
 
$
175

 
21.0
 %
Increase (decrease) resulting from:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Tax-exempt income from municipal bonds
 
(5
)
 
(1.7
)
 
(5
)
 
(0.8
)
 
(14
)
 
(0.8
)
 
(15
)
 
(1.8
)
Dividend received exclusion
 
(3
)
 
(1.0
)
 
(3
)
 
(0.5
)
 
(11
)
 
(0.7
)
 
(11
)
 
(1.3
)
Tax accounting method changes
 
—

 
—

 
(50
)
 
(8.1
)
 
—

 
—

 
(50
)
 
(6.0
)
Other
 
(8
)
 
(2.7
)
 
(7
)
 
(1.1
)
 
(10
)
 
(0.6
)
 
(6
)
 
(0.7
)
Provision for income taxes
 
$
46

 
15.6
 %
 
$
65

 
10.5
 %
 
$
320

 
18.9
 %
 
$
93

 
11.2
 %