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Segments - Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 10,340	$ 8,548	$ 30,151	$ 25,024
Medicaid
Segment Reporting Information [Line Items]
Total revenue	8,263	6,976	23,896	20,282
Medicare
Segment Reporting Information [Line Items]
Total revenue	1,385	1,046	4,301	3,157
Marketplace
Segment Reporting Information [Line Items]
Total revenue	672	507	1,894	1,528
Other
Segment Reporting Information [Line Items]
Total revenue	$ 20	$ 19	$ 60	$ 57

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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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