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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 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 |  | $ 82 | $ 66
Risk adjustment payable |  | 207 | 201
Risk adjustment receivable |  | 282 | 241
Risk adjustment, net receivable |  | $ 75 | $ 40
Risk adjustment, credit loss allowance | $ 41 |  |
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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- Details
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