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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 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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