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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Current liabilities: Derivative liability | 1.125% Conversion Option |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative liabilities | $ 21 | $ 476
5.375% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate on notes | 5.375% |
4.875% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate on notes | 4.875% |
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% |
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% |
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 1,254 | 1,260
Carrying Amount | Senior Notes | 5.375% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 695 | 694
Carrying Amount | Senior Notes | 4.875% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 327 | 326
Carrying Amount | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 220 | 0
Carrying Amount | Convertible Notes | 1.125% Convertible Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 12 | 240
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 1,332 | 1,707
Fair Value | Senior Notes | 5.375% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 744 | 674
Fair Value | Senior Notes | 4.875% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 334 | 301
Fair Value | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | 220 | 0
Fair Value | Convertible Notes | 1.125% Convertible Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 34 | $ 732

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