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Segments - Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 9,880	$ 8,327	$ 19,811	$ 16,476
Medicaid
Segment Reporting Information [Line Items]
Total revenue	7,760	6,728	15,633	13,306
Medicare
Segment Reporting Information [Line Items]
Total revenue	1,459	1,055	2,916	2,111
Marketplace
Segment Reporting Information [Line Items]
Total revenue	641	524	1,222	1,021
Other
Segment Reporting Information [Line Items]
Total revenue	$ 20	$ 20	$ 40	$ 38

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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