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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Jun. 06, 2017
Current portion of long-term debt:
Lease financing obligations	$ 1	$ 1
Debt issuance costs	(1)	(4)
Current portion of long-term debt	296	653
Non-current portion of long-term debt:
Debt issuance costs	(11)	(12)
Senior notes	1,019	1,318
Lease financing obligations	198	198
Total debt	$ 1,513	2,169
1.125% Notes
Non-current portion of long-term debt:
Percentage of contractual interest rate on Notes	1.125%
Unamortized discount	$ 18	51
1.625% Notes (2)
Non-current portion of long-term debt:
Unamortized discount		3
Convertible Notes | 1.125% Notes
Current portion of long-term debt:
Debt net of unamortized discount	$ 296	$ 499
Non-current portion of long-term debt:
Percentage of contractual interest rate on Notes	1.125%	1.125%
Convertible Notes | 1.625% Notes (2)
Current portion of long-term debt:
Debt net of unamortized discount	$ 0	$ 157
Non-current portion of long-term debt:
Percentage of contractual interest rate on Notes	1.625%
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%
Credit Facility
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 0	$ 300

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