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Fair Value Measurements - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Contingent consideration liabilities |  |  | $ 40 |  |  |
Cash received for partial settlement of call option |  |  | $ 27 | $ 578 |  |
Measurement Input, Expected Asset Volatility [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Business combination, contingent consideration, liability, measurement input |  |  | 0.35 |  |  |
Measurement Input, Measurement Period [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Business combination, contingent consideration, liability, measurement input |  |  | 5 |  |  |
Measurement Input, Expected Revenue Volatility [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Business combination, contingent consideration, liability, measurement input |  |  | 0.09 |  |  |
Minimum |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Contingent consideration liabilities |  |  | $ 25 |  |  |
Maximum |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Contingent consideration liabilities |  |  | 75 |  |  |
Passport health plan inc |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Contingent consideration liabilities |  |  | $ 40 |  |  |
Passport health plan inc | Fair value, recurring |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  | $ 40 |
1.125% Convertible Notes, net of unamortized discount |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of contractual interest rate on notes |  |  | 1.125% |  |  |
1.125% Convertible Notes, net of unamortized discount | 1.125% Convertible Notes, net of unamortized discount |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash received for partial 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%

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