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Segments - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 27,771	$ 19,423	$ 16,829
Medicaid
Segment Reporting Information [Line Items]
Revenues	21,231	15,217	13,026
Medicare
Segment Reporting Information [Line Items]
Revenues	3,379	2,529	2,265
Marketplace Segment
Segment Reporting Information [Line Items]
Revenues	3,091	1,677	1,538
Other
Segment Reporting Information [Line Items]
Revenues	$ 70	$ 0	$ 0

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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