Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 9,451	$ 9,493
Goodwill acquired	628	5
Foreign currency translation adjustments, net	(120)	(47)
Other adjustments	(12)
Goodwill, ending balance	9,947	9,451
U.S. Pharmaceutical
Goodwill [Roll Forward]
Goodwill, beginning balance	3,923	3,963
Goodwill acquired	160	0
Foreign currency translation adjustments, net	(21)	(40)
Other adjustments	(12)
Goodwill, ending balance	4,050	3,923
Prescription Technology Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	1,542	1,542
Goodwill acquired	463	0
Foreign currency translation adjustments, net	0	0
Other adjustments	0
Goodwill, ending balance	2,005	1,542
Medical-Surgical Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	2,453	2,453
Goodwill acquired	0	0
Foreign currency translation adjustments, net	0	0
Other adjustments	0
Goodwill, ending balance	2,453	2,453
International
Goodwill [Roll Forward]
Goodwill, beginning balance	1,533	1,535
Goodwill acquired	5	5
Foreign currency translation adjustments, net	(99)	(7)
Other adjustments	0
Goodwill, ending balance	$ 1,439	$ 1,533