Goodwill and Intangible Assets - Schedule Of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 10,036	$ 9,903
Total accumulated amortization	(2,212)	(1,515)
Intangible assets, net	$ 7,824	$ 8,388
Weighted average life in years	13 years 2 months 12 days	13 years 1 month 6 days
Purchased contract rights and customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 8,068	$ 8,102
Total accumulated amortization	$ (1,642)	$ (1,046)
Weighted average life in years	13 years 6 months	13 years 4 months 24 days
Provider contracts
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 492	$ 526
Total accumulated amortization	$ (139)	$ (152)
Weighted average life in years	13 years 9 months 18 days	13 years 6 months
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 1,107	$ 939
Total accumulated amortization	$ (206)	$ (140)
Weighted average life in years	13 years 3 months 18 days	13 years 9 months 18 days
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 369	$ 336
Total accumulated amortization	$ (225)	$ (177)
Weighted average life in years	5 years 4 months 24 days	4 years 9 months 18 days