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Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 9,493	$ 9,360
Goodwill acquired	5	5
Acquisition accounting, transfers, and other adjustments		2
Other changes/disposals		(1)
Impairment charges	0	(69)	$ (2)
Foreign currency translation adjustments, net	(47)	196
Goodwill, ending balance	9,451	9,493	9,360
U.S. Pharmaceutical
Goodwill [Roll Forward]
Goodwill, beginning balance	3,963	3,924
Goodwill acquired	0	0
Acquisition accounting, transfers, and other adjustments		0
Other changes/disposals		(1)
Impairment charges		0
Foreign currency translation adjustments, net	(40)	40
Goodwill, ending balance	3,923	3,963	3,924
Prescription Technology Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	1,542	1,540
Goodwill acquired	0	0
Acquisition accounting, transfers, and other adjustments		2
Other changes/disposals		0
Impairment charges		0
Foreign currency translation adjustments, net	0	0
Goodwill, ending balance	1,542	1,542	1,540
Medical-Surgical Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	2,453	2,453
Goodwill acquired	0	0
Acquisition accounting, transfers, and other adjustments		0
Other changes/disposals		0
Impairment charges		0
Foreign currency translation adjustments, net	0	0
Goodwill, ending balance	2,453	2,453	2,453
International
Goodwill [Roll Forward]
Goodwill, beginning balance	1,535	1,443
Goodwill acquired	5	5
Acquisition accounting, transfers, and other adjustments		0
Other changes/disposals		0
Impairment charges		(69)
Foreign currency translation adjustments, net	(7)	156
Goodwill, ending balance	$ 1,533	$ 1,535	$ 1,443

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