Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,493
Foreign currency translation adjustments, net	27
Ending balance	9,520
U.S. Pharmaceutical
Goodwill [Roll Forward]
Beginning balance	3,963
Foreign currency translation adjustments, net	7
Ending balance	3,970
Prescription Technology Solutions
Goodwill [Roll Forward]
Beginning balance	1,542
Foreign currency translation adjustments, net	0
Ending balance	1,542
Medical-Surgical Solutions
Goodwill [Roll Forward]
Beginning balance	2,453
Foreign currency translation adjustments, net	0
Ending balance	2,453
International
Goodwill [Roll Forward]
Beginning balance	1,535
Foreign currency translation adjustments, net	20
Ending balance	$ 1,555