Business Acquisitions and Divestitures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Business Acquisition [Line Items]
Goodwill	$ 25,947	$ 25,317
Paragon Healthcare, Inc.
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	553
Goodwill	635
BioPlus Parent, LLC and Subsidiaries
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	820
Goodwill	893
Measurement period adjustments	$ (5)