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Summary of Significant Accounting Policies - Medical Claims Liability (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Premium deficiency reserve liability	$ (158)	$ 250
Medicare
Segment Reporting Information [Line Items]
Premium deficiency reserve liability	(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

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- Definition

Premium Deficiency Reserve Liability

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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