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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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- Definition

Premium Deficiency Reserve Liability Adjustment

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- Definition

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