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Goodwill and Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill impairment charges | $ 0 | $ 0 |
Future Amortization Expenses |  |  |
Future amortization expense, 2020 | 14 |  |
Future amortization expense, 2021 | 5 |  |
Future amortization expense, 2022 | 3 |  |
Future amortization expense, 2023 | 3 |  |
Future amortization expense, 2024 | 3 |  |
Health Plans |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross goodwill | 445 | 445 |
Accumulated impairment loss | 302 | 302 |
Goodwill impairment charges | 0 | 0 | $ 244
Future Amortization Expenses |  |  |
Impairment of intangible assets |  |  | 25
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill impairment charges | $ 0 | $ 0 | 190
Future Amortization Expenses |  |  |
Impairment of intangible assets |  |  | $ 11

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