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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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Amount of liability recognized arising from contingent consideration in a business combination.

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Contractual interest rate for funds borrowed, under the debt agreement.

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