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Medical Claims Liability - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Insurance [Abstract] |  |  |
Amounts recorded as an adjustment to premium revenues related to minimum MLR and return of premium programs | $ 93 | $ 243 | $ 382
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 | Medicare Advantage 2024 |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability |  |  | $ 250
Medicare | Medicare Advantage 2025 |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability |  | $ 92 |
Medicare | Medicare Advantage 2026 |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve liability | $ 0 |  |

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- Definition Amounts Recorded As An Adjustment To Premium Revenues Related To Minimum MLR And Return Of Premium Programs + References No definition available. + Details
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