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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recognized gain (loss)	$ 4	$ 3
Contingent consideration liabilities	8		$ 47
Contingent consideration liabilities settled	20	$ 20
(Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities			$ 47
Passport Health Plan, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration paid to seller included in financing and operating activities	43
Passport Health Plan, Inc. | Minimum Member Enrollment Targets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Remaining half of contingent consideration paid	23
Passport Health Plan, Inc. | Operating Income Guarantee
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities settled	20
Passport Health Plan, Inc. | (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	$ 8

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

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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