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Business Combinations - Summary of Fair Value Consideration (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Jan. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash |  | $ 344 | $ 3
Bright Health Medicare |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash | $ 341 |  |
Contingent consideration | 86 |  |
Fair value of net assets acquired | $ 427 |  |

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