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Fair Value Measurements - Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 06, 2017
--- | --- | --- | ---
Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 1,260 | $ 1,970 |
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 1,707 | 2,631 |
5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 5.375% |  |
4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 4.875% |  |
1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.125% |  |
1.625% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.625% |  |
Senior Notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 5.375% |  |
Senior Notes | 5.375% Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 694 | 692 |
Senior Notes | 5.375% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 674 | 730 |
Senior Notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 4.875% |  | 4.875%
Senior Notes | 4.875% Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 326 | 325 |
Senior Notes | 4.875% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 301 | 329 |
Convertible Debt | 1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.125% |  |
Convertible Debt | 1.125% Convertible Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 240 | 496 |
Convertible Debt | 1.125% Convertible Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 732 | 1,052 |
Convertible Debt | 1.625% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.625% |  |
Convertible Debt | 1.625% Convertible Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 0 | 157 |
Convertible Debt | 1.625% Convertible Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | 0 | 220 |
Credit Facility | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | 0 | 300 |
Credit Facility | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | 0 | 300 |
Current liabilities | 1.125% Conversion Option |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative liability | $ 476 | $ 522 |

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