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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Jun. 06, 2017
Current portion of long-term debt:
Lease financing obligations	$ 0	$ 1
Debt issuance costs	(1)	(1)
Current portion of long-term debt	198	241
Non-current portion of long-term debt:
Debt issuance costs	(9)	(10)
Senior notes	$ 1,121	1,020
1.125% Convertible Notes
Non-current portion of long-term debt:
Percentage of contractual interest rate on Notes	1.125%
Convertible Notes | 1.125% Convertible Notes
Current portion of long-term debt:
Debt net of unamortized discount	$ 199	$ 241
Non-current portion of long-term debt:
Percentage of contractual interest rate on Notes	1.125%	1.125%
Senior Notes | 5.375% Notes
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 700	$ 700
Percentage of contractual interest rate on Notes	5.375%
Senior Notes | 4.875% Notes
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 330	330
Percentage of contractual interest rate on Notes	4.875%		4.875%
Line of Credit | Term Loan
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 100	$ 0

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