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Segments - Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 8,548	$ 7,927	$ 25,024	$ 23,751
Medicaid
Segment Reporting Information [Line Items]
Revenues	6,976	6,380	20,282	19,091
Medicare
Segment Reporting Information [Line Items]
Revenues	1,046	955	3,157	2,867
Marketplace
Segment Reporting Information [Line Items]
Revenues	507	575	1,528	1,740
Other
Segment Reporting Information [Line Items]
Revenues	$ 19	$ 17	$ 57	$ 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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