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Fair Value Measurements - Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jan. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 4.875% |  |
Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 2,127 |  | $ 1,255
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 2,276 |  | 1,347
Senior Notes | 4.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 4.375% |  |
Senior Notes | 4.375% Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 789 |  | 0
Senior Notes | 4.375% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 843 |  | 0
Senior Notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 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 | $ 697 |  | 696
Senior Notes | 5.375% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 742 |  | 745
Senior Notes | 3.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 3.875% |  |
Senior Notes | 3.875% Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 641 |  | 0
Senior Notes | 3.875% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 691 |  | 0
Senior Notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 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 | $ 0 |  | 327
Senior Notes | 4.875% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | 0 |  | 340
Term Loan Facility | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | 0 |  | 220
Term Loan Facility | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 0 |  | $ 220
Convertible Debt | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 4.875% |  |
Convertible Debt | 1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 1.125% | 1.125% | 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 | $ 0 |  | $ 12
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 | $ 0 |  | $ 42

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