Medical Claims Liability - Narrative (Details) - USD ($) |
9 Months Ended | ||||
|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
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| Segment Reporting [Line Items] | |||||
| Amounts recorded as an adjustment to premium revenues related to minimum HBR and return of premium programs | $ 35,000,000 | $ 86,000,000 | |||
| Short-duration insurance contracts, Incurred but not reported and expected development on reported claims | 12,184,000,000 | ||||
| Premium deficiency reserve | 190,000,000 | ||||
| Medicare | |||||
| Segment Reporting [Line Items] | |||||
| Premium deficiency reserve | 190,000,000 | ||||
| Medicare | Medicare Advantage 2025 | |||||
| Segment Reporting [Line Items] | |||||
| Premium deficiency reserve | 282,000,000 | $ 389,000,000 | $ 270,000,000 | $ 92,000,000 | |
| Premium deficiency reserve liability increase (decrease) | $ (107,000,000) | ||||
| Medicare | Medicare Advantage 2026 | |||||
| Segment Reporting [Line Items] | |||||
| Premium deficiency reserve | $ 0 | ||||
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- Definition Amounts Recorded As An Adjustment To Premium Revenues Related To Minimum HBR and Return Of Premium Programs No definition available.
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- Definition Premium Deficiency Reserve Liability No definition available.
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- Definition Premium Deficiency Reserve Liability Increase (Decrease) No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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