Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 9,786	$ 9,817
Goodwill acquired	2,858	21
Acquisition accounting, transfers and other adjustments	(145)	8
Impairment	(290)	0	$ 0
Amount reclassified to assets held for sale	(165)
Goodwill disposed	(1,108)	(86)
Foreign currency translation adjustments, net	(350)	26
Goodwill, ending balance	10,586	9,786	9,817
Distribution Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	7,987	7,994
Goodwill acquired	2,836	21
Acquisition accounting, transfers and other adjustments	(146)	8
Impairment	0
Amount reclassified to assets held for sale	(165)
Goodwill disposed	(30)	(59)
Foreign currency translation adjustments, net	(350)	23
Goodwill, ending balance	10,132	7,987	7,994
Technology Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	1,799	1,823
Goodwill acquired	22	0
Acquisition accounting, transfers and other adjustments	1	0
Impairment	(290)
Amount reclassified to assets held for sale	0
Goodwill disposed	(1,078)	(27)
Foreign currency translation adjustments, net	0	3
Goodwill, ending balance	$ 454	$ 1,799	$ 1,823