Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 10,132
Goodwill acquired	0
Disposals (1)	(47)
Foreign currency translation adjustments, net	2
Other adjustments	0
Ending balance	10,087
U.S. Pharmaceutical
Goodwill [Roll Forward]
Beginning balance	4,123
Goodwill acquired	0
Disposals (1)	0
Foreign currency translation adjustments, net	0
Other adjustments	0
Ending balance	4,123
Prescription Technology Solutions
Goodwill [Roll Forward]
Beginning balance	2,024
Goodwill acquired	0
Disposals (1)	0
Foreign currency translation adjustments, net	0
Other adjustments	0
Ending balance	2,024
Medical-Surgical Solutions
Goodwill [Roll Forward]
Beginning balance	2,536
Goodwill acquired	0
Disposals (1)	0
Foreign currency translation adjustments, net	0
Other adjustments	(29)
Ending balance	2,507
International
Goodwill [Roll Forward]
Beginning balance	1,449
Goodwill acquired	0
Disposals (1)	(47)
Foreign currency translation adjustments, net	2
Other adjustments	0
Ending balance	1,404
Corporate
Goodwill [Roll Forward]
Beginning balance	0
Goodwill acquired	0
Disposals (1)	0
Foreign currency translation adjustments, net	0
Other adjustments	29
Ending balance	$ 29