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Segments - Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 9,931	$ 8,149
Medicaid
Segment Reporting Information [Line Items]
Total revenue	7,873	6,578
Medicare
Segment Reporting Information [Line Items]
Total revenue	1,457	1,056
Marketplace
Segment Reporting Information [Line Items]
Total revenue	581	497
Other
Segment Reporting Information [Line Items]
Total revenue	$ 20	$ 18

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- Definition

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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