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Segments - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 7,770	$ 6,522
Medicaid
Segment Reporting Information [Line Items]
Revenues	6,187	5,020
Medicare
Segment Reporting Information [Line Items]
Revenues	949	805
Marketplace
Segment Reporting Information [Line Items]
Revenues	616	680
Other
Segment Reporting Information [Line Items]
Revenues	$ 18	$ 17

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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