Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Jun. 30, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 10,022
Goodwill acquired	1,277
Disposals	(9)
Foreign currency translation adjustments, net	75
Other adjustments	0
Goodwill, ending balance	11,365
U.S. Pharmaceutical
Goodwill [Roll Forward]
Goodwill, beginning balance	4,132
Goodwill acquired	1,238
Disposals	(9)
Foreign currency translation adjustments, net	0
Other adjustments	29
Goodwill, ending balance	5,390
Prescription Technology Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	2,027
Goodwill acquired	39
Disposals	0
Foreign currency translation adjustments, net	0
Other adjustments	0
Goodwill, ending balance	2,066
Medical-Surgical Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	2,507
Goodwill acquired	0
Disposals	0
Foreign currency translation adjustments, net	0
Other adjustments	0
Goodwill, ending balance	2,507
International
Goodwill [Roll Forward]
Goodwill, beginning balance	1,327
Goodwill acquired	0
Disposals	0
Foreign currency translation adjustments, net	75
Other adjustments	0
Goodwill, ending balance	1,402
Corporate
Goodwill [Roll Forward]
Goodwill, beginning balance	29
Goodwill acquired	0
Disposals	0
Foreign currency translation adjustments, net	0
Other adjustments	(29)
Goodwill, ending balance	$ 0