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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Jun. 06, 2017
--- | --- | --- | ---
1.125% 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% 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% Notes (2) |  |  |
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 | $ 1,314 | $ 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% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 295 | 496 |
Carrying Amount | Convertible Notes | 1.625% Notes (2) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 0 | 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 | 2,178 | 2,631 |
Fair Value | Senior Notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 711 | 730 |
Fair Value | Senior Notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 325 | 329 |
Fair Value | Convertible Notes | 1.125% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 1,142 | 1,052 |
Fair Value | Convertible Notes | 1.625% Notes (2) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 0 | 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 | $ 843 | $ 522 |

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