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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Amounts due to government agencies, risk adjustment and part d risk sharing | $ 91 | $ 66
Risk adjustment payable | 267 | 201
Risk adjustment receivable | 296 | 241
Risk adjustment, net receivable | $ 29 | $ 40
Maturity period (less than) | 15 years |
Structured Securities |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Average maturity period (less than) | 15 years |

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