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Summary of Significant Accounting Policies - Medical Claims Liability (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability | $ (92) | $ (158) | $ 250
Medicare |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability | (92) | (158) | 250
Medicare Advantage 2024 | Medicare |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability |  |  | $ 250
Medicare Advantage 2025 | Medicare |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability |  | $ 92 |
Medicare Advantage 2026 | Medicare |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability | $ 0 |  |

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