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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 06, 2017
1.125% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on Notes	1.125%
Senior Notes | 5.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on Notes	5.375%
Senior Notes | 4.875% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on Notes	4.875%		4.875%
Convertible Notes | 1.125% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on Notes	1.125%	1.125%
Convertible Notes | 1.625% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of contractual interest rate on Notes	1.625%
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	$ 1,502	$ 1,970
Carrying Amount | Senior Notes | 5.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	693	692
Carrying Amount | Senior Notes | 4.875% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	326	325
Carrying Amount | Convertible Notes | 1.125% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	420	496
Carrying Amount | Convertible Notes | 1.625% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	63	157
Carrying Amount | Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	0	300
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	2,232	2,631
Fair Value | Senior Notes | 5.375% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	706	730
Fair Value | Senior Notes | 4.875% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	320	329
Fair Value | Convertible Notes | 1.125% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	1,099	1,052
Fair Value | Convertible Notes | 1.625% Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	107	220
Fair Value | Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	0	300
Current liabilities: Derivative liability | 1.125% Conversion Option
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	$ 657	$ 522

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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