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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense (Benefit) and Effective Tax Rate
The Company’s income tax expense and effective tax rate for the three and nine months ended September 30, 2018 and 2017 were as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
(dollars in millions)
Income tax expense
$
66

 
$
31

 
$
208

 
$
88

Effective tax rate
23
%
 
9
%
 
20
%
 
10
%