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Medical Claims Liability - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	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

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