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Segments - Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 8,327	$ 8,054	$ 16,476	$ 15,824
Medicaid
Segment Reporting Information [Line Items]
Revenues	6,728	6,524	13,306	12,711
Medicare
Segment Reporting Information [Line Items]
Revenues	1,055	963	2,111	1,912
Marketplace
Segment Reporting Information [Line Items]
Revenues	524	549	1,021	1,165
Other
Segment Reporting Information [Line Items]
Revenues	$ 20	$ 18	$ 38	$ 36

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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