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Debt - Details of the Liability Component (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jun. 06, 2017
Debt Instrument [Line Items]
Lease financing obligations	$ 1	$ 1
Debt issuance costs	(1)	(4)
Current portion of long-term debt	241	653
Debt issuance costs	(10)	(12)
Long-term debt	1,020	1,318
Lease financing obligations	197	198
Long-term debt and capital lease obligations	$ 1,458	2,169
1.125% Convertible Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate	1.125%
1.625% Convertible Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate	1.625%
5.375% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate	5.375%
4.875% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate	4.875%
Convertible Debt | 1.125% Convertible Notes
Debt Instrument [Line Items]
Current portion of long-term debt	$ 241	499
Percentage of contractual interest rate	1.125%
Convertible Debt | 1.625% Convertible Notes
Debt Instrument [Line Items]
Current portion of long-term debt	$ 0	157
Percentage of contractual interest rate	1.625%
Senior Notes | 5.375% Notes
Debt Instrument [Line Items]
Non-current portion of long-term debt	$ 700	700
Percentage of contractual interest rate	5.375%
Senior Notes | 4.875% Notes
Debt Instrument [Line Items]
Non-current portion of long-term debt	$ 330	330
Percentage of contractual interest rate	4.875%		4.875%
Credit Facility
Debt Instrument [Line Items]
Non-current portion of long-term debt	$ 0	$ 300

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Long-Term Debt, Current Maturities, Net Of Unamortized Premium (Discount)

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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