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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |  |
Maturity period (less than) |  | 15 years |  |
Average maturity period (less than) |  | 15 years |  |
Interest receivable | $ 35 | $ 35 | $ 11 |
Contingent consideration liabilities | 8 | 8 | 47 |
Contingent consideration liabilities settled |  | 20 | 20 | $ 0
ROU assets impairments | 192 |  |  |
Marketplace risk adjustment payables | 230 | 230 | 902 |
Risk adjustment receivable | 135 | 135 | 7 |
Risk adjustment, net payable | 95 | 95 | 895 |
Prepaid reinsurance premiums | 2 | 2 | 2 | 9
Reinsurance recoveries |  | 35 | 33 | 23
Reinsurance recoverable | 27 | $ 27 | 51 | $ 30
New York |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Premium revenue percentage |  | 10.00% |  |
Texas |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Premium revenue percentage |  | 12.00% |  |
Washington |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Premium revenue percentage |  | 13.60% |  |
Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment on property and equipment |  | $ 16 |  |
Level 3 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Contingent consideration liabilities | $ 8 | 8 | 47 |
COVID-19 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Reduction in premiums |  | $ 197 | $ 323 |
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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