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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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