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Medical Claims Liability - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |
Amounts recorded as an adjustment to premium revenues related to minimum HBR and return of premium programs | $ 21,000,000 | $ 34,000,000 |
Short-duration insurance contracts, Incurred but not reported and expected development on reported claims | 13,510,000,000 |  |
Premium deficiency reserve |  | 178,000,000 |
Medicare |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve |  | 178,000,000 |
Medicare | Medicare Advantage 2025 |  |  |
Segment Reporting Information [Line Items] |  |  |
Premium deficiency reserve |  | $ 270,000,000 | $ 92,000,000
Medicare | Medicare Advantage 2026 |  |  |
Segment Reporting Information [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 + References No definition available. + Details
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- Definition Premium Deficiency Reserve Liability + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4D + Details
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