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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 02, 2020 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash received for settlement of call option |  |  | $ 27 | $ 473 |  |
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] |  |  |  |  |  |
Cash received for settlement of call option |  | $ 27 |  |  |  |
Repayments of debt | $ 39 |  |  |  |  |
Debt net of unamortized discount |  |  | $ 0 |  |  | $ 12
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 |  |  | $ 1,812 |  |  | $ 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 |  |  | 696 |  |  | 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 |  |  | 1,858 |  |  | 1,347
Fair Value | Senior notes | 4.375% Notes |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of debt |  |  | 802 |  |  | 0
Fair Value | Senior notes | 5.375% Notes |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of debt |  |  | 723 |  |  | 745
Fair Value | Senior notes | 4.875% Notes |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of debt |  |  | 333 |  |  | 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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