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Debt (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Debt
The Company’s short and long-term debt consists of the following:
 
 
As of
(Dollars in millions)
 
June 30, 2019
 
December 31, 2018
Short-Term Debt:
 
 
 
 
Short-term borrowings
 
$
20

 
$
—

Long-Term Debt:
 
 
 
 
4.00% Convertible Senior Notes due 2024 (Carrying value)
 
$
156

 
$
—

Total Debt
 
$
176

 
$
—


The following table presents the outstanding principal amount and carrying value of the Notes:
 4.00% Convertible Senior Notes due 2024
 
As of
(Dollars in millions)
 
June 30, 2019
 
December 31, 2018
Principal amount (face value)
 
$
207

 
$
—

Unamortized issuance cost
 
(5
)
 
—

Unamortized debt discount
 
(46
)

—

Net Carrying value
 
$
156

 
$
—