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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Provision for Income Tax and Effective Tax Provision Rate
The following table presents our provision for income tax and effective tax provision rate:
 
Three Months Ended March 31,
 
2020
2019
 
(Dollars in millions)
Provision for income taxes
$
10

$
8

Effective tax provision rate
18.5
%
18.4
%