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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recognized loss	$ 3
Contingent consideration liabilities	26	$ 46
(Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities		$ 46
Passport Health Plan, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Paid to seller	23
Passport Health Plan, Inc. | (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	$ 26

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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- Definition

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

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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

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