Business Acquisitions (Intangible Assets Acquired) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Total intangible assets	$ 339	$ 1,597
State Medicaid Licenses [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired	250	20
Customer-related [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 85	$ 1,313
Intangible assets amortization period, years	10 years	13 years
Provider And Hospital Relationships [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 2	$ 240
Intangible assets amortization period, years	15 years	14 years
Other [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 2	$ 24
Intangible assets amortization period, years	6 months	13 years