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Segments - Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 8,149	$ 7,770
Medicaid
Segment Reporting Information [Line Items]
Revenues	6,578	6,187
Medicare
Segment Reporting Information [Line Items]
Revenues	1,056	949
Marketplace
Segment Reporting Information [Line Items]
Revenues	497	616
Other
Segment Reporting Information [Line Items]
Revenues	$ 18	$ 18

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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