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Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 10,924	$ 10,924	$ 10,586
Goodwill acquired			442	1,707
Acquisition accounting, transfers and other adjustments			35	39
Goodwill impairment			(1,797)	(1,738)	$ (290)
Goodwill disposed (2)				(172)
Amount reclassified to assets held for sale				(2)
Foreign currency translation adjustments, net			(246)	504
Goodwill, ending balance	$ 9,358		9,358	10,924	10,586
U.S. Pharmaceutical and Specialty Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance		4,110	4,110	3,391
Goodwill acquired			17	657
Acquisition accounting, transfers and other adjustments			13	4
Goodwill impairment			0	0
Goodwill disposed (2)				(37)
Amount reclassified to assets held for sale				0
Foreign currency translation adjustments, net			(62)	95
Goodwill, ending balance	4,078		4,078	4,110	3,391
European Pharmaceutical Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance		1,850	1,850	2,789
Goodwill acquired			52	26
Acquisition accounting, transfers and other adjustments			(5)	0
Goodwill impairment	(1,206)	(570)	(1,776)	(1,283)
Goodwill disposed (2)				(11)
Amount reclassified to assets held for sale				(2)
Foreign currency translation adjustments, net			(121)	331
Goodwill, ending balance	0		0	1,850	2,789
Medical-Surgical Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance		2,070	2,070	2,069
Goodwill acquired			360	0
Acquisition accounting, transfers and other adjustments			21	1
Goodwill impairment			0	0
Goodwill disposed (2)				0
Amount reclassified to assets held for sale				0
Foreign currency translation adjustments, net			0	0
Goodwill, ending balance	2,451		2,451	2,070	2,069
Other
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 2,894	2,894	2,337
Goodwill acquired			13	1,024
Acquisition accounting, transfers and other adjustments			6	34
Goodwill impairment			(21)	(455)	(290)
Goodwill disposed (2)				(124)
Amount reclassified to assets held for sale				0
Foreign currency translation adjustments, net			(63)	78
Goodwill, ending balance	$ 2,829		$ 2,829	$ 2,894	$ 2,337

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