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Fair Value Measurements - Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 02, 2020 | Dec. 31, 2019
--- | --- | --- | ---
4.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate on notes | 4.375% |  |
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 | 4.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate on notes |  | 4.375% |
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 debt | 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%
Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | $ 1,813 |  | $ 1,255
Carrying Amount | Senior notes | 4.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 789 |  | 0
Carrying Amount | Senior notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 697 |  | 696
Carrying Amount | Senior notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 327 |  | 327
Carrying Amount | Term loan facility |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 0 |  | 220
Carrying Amount | Convertible debt | 1.125% Convertible notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 0 |  | 12
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 1,884 |  | 1,347
Fair Value | Senior notes | 4.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 816 |  | 0
Fair Value | Senior notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 731 |  | 745
Fair Value | Senior notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 337 |  | 340
Fair Value | Term loan facility |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 0 |  | 220
Fair Value | Convertible debt | 1.125% Convertible notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | $ 0 |  | $ 42

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