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Goodwill and Intangible Assets, Net - Balances of Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Beginning balance	$ 692,000,000	$ 143,000,000
Acquisitions and measurement period adjustments	290,000,000	549,000,000
Dispositions	0	0
Impairment	0	0
Ending balance	982,000,000	692,000,000
Medicaid
Goodwill [Roll Forward]
Beginning balance	489,000,000	143,000,000
Acquisitions and measurement period adjustments	280,000,000	346,000,000
Dispositions	0	0
Impairment	0	0
Ending balance	769,000,000	489,000,000
Medicare
Goodwill [Roll Forward]
Beginning balance	161,000,000	0
Acquisitions and measurement period adjustments	8,000,000	161,000,000
Dispositions	0	0
Impairment	0	0
Ending balance	169,000,000	161,000,000
Other
Goodwill [Roll Forward]
Beginning balance	42,000,000	0
Acquisitions and measurement period adjustments	2,000,000	42,000,000
Dispositions	0	0
Impairment	0	0
Ending balance	$ 44,000,000	$ 42,000,000

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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