Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Convertible Debenture Terms

The following table summarizes at June 30, 2019 the related balances, conversion rate and conversion price of the Debentures:

Outstanding principal amount	$	267
Unamortized debt discount	$	86
Net debt carrying amount	$	179
Equity component carrying amount	$	97
Conversion rate (shares of common stock per $1,000 of principal amount)	13.8964
Effective conversion price (per $1,000 of principal amount)	$	71.9607