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Goodwill and Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Future Amortization Expenses |  |
Future amortization expense, 2021 | $ 46 |
Future amortization expense, 2022 | 44 |
Future amortization expense, 2023 | 44 |
Future amortization expense, 2024 | 44 |
Future amortization expense, 2025 | 43 |
Health Plans |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross goodwill | 994 | $ 445
Accumulated impairment loss | $ 302 | $ 302

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