Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance		$ 9,947
Goodwill acquired	$ 3
Foreign currency translation adjustments, net		30
Other adjustments		(7)
Ending balance	9,973	9,973
U.S. Pharmaceutical
Goodwill [Roll Forward]
Beginning balance		4,050
Goodwill acquired	0
Foreign currency translation adjustments, net		0
Other adjustments		(7)
Ending balance	4,043	4,043
Prescription Technology Solutions
Goodwill [Roll Forward]
Beginning balance		2,005
Goodwill acquired	0
Foreign currency translation adjustments, net		0
Other adjustments		0
Ending balance	2,005	2,005
Medical-Surgical Solutions
Goodwill [Roll Forward]
Beginning balance		2,453
Goodwill acquired	0
Foreign currency translation adjustments, net		0
Other adjustments		0
Ending balance	2,453	2,453
International
Goodwill [Roll Forward]
Beginning balance		1,439
Goodwill acquired	3
Foreign currency translation adjustments, net		30
Other adjustments		0
Ending balance	$ 1,472	$ 1,472