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Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Maturity period (less than) | 10 years |  |
Average maturity period (less than) | 10 years |  |
Interest receivable | $ 11,000,000 | $ 10,000,000 |
Contingent consideration liabilities | 47,000,000 | 46,000,000 |
Impairment | 0 | 0 |
Marketplace risk adjustment payables | 902,000,000 | 326,000,000 |
Risk adjustment receivable | 7,000,000 | 20,000,000 |
Risk adjustment, net payable | 895,000,000 | 306,000,000 |
Prepaid reinsurance premiums | 2,000,000 | 9,000,000 | $ 17,000,000
Reinsurance recoveries | 33,000,000 | 23,000,000 | 18,000,000
Reinsurance recoverable | 51,000,000 | 30,000,000 | $ 21,000,000
Level 3 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Contingent consideration liabilities | 47,000,000 | 46,000,000 |
MMP plans |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Reduction in premiums |  | 564,000,000 |
COVID-19 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Reduction in premiums | $ 323,000,000 | $ 37,000,000 |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 5 years |  |
Minimum | Premium revenue |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of additional incremental revenue earned | 1.00% |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 16 years |  |
Maximum | Premium revenue |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of additional incremental revenue earned | 4.00% |  |

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