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Segments - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 7,927	$ 7,040	$ 23,751	$ 20,362
Medicaid
Segment Reporting Information [Line Items]
Revenues	6,380	5,354	19,091	15,583
Medicare
Segment Reporting Information [Line Items]
Revenues	955	875	2,867	2,502
Marketplace
Segment Reporting Information [Line Items]
Revenues	575	793	1,740	2,224
Other
Segment Reporting Information [Line Items]
Revenues	$ 17	$ 18	$ 53	$ 53

X

- 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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