Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill and Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
Goodwill [Roll Forward]
Beginning balance			$ 9,786
Goodwill acquired			1,619
Impairment	$ (290)	$ 0	(290)	$ 0
Amount reclassified to assets held for sale			(1,075)
Acquisition accounting, transfers and other adjustments			(143)
Foreign currency translation adjustments, net			(204)
Ending balance	9,693		9,693
Accumulated goodwill impairment losses	290		290		$ 36
Distribution Solutions
Goodwill [Roll Forward]
Beginning balance			7,987
Goodwill acquired			1,597
Impairment			0
Amount reclassified to assets held for sale			0
Acquisition accounting, transfers and other adjustments			(143)
Foreign currency translation adjustments, net			(202)
Ending balance	9,239		9,239
Technology Solutions
Goodwill [Roll Forward]
Beginning balance			1,799
Goodwill acquired			22
Impairment	(290)		(290)
Amount reclassified to assets held for sale			(1,075)
Acquisition accounting, transfers and other adjustments			0
Foreign currency translation adjustments, net			(2)
Ending balance	$ 454		$ 454