Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill and Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Goodwill [Roll Forward]
Beginning balance				$ 9,786
Goodwill acquired				2,832
Impairment	$ 0		$ 0	(290)	$ 0
Amount reclassified to assets held for sale				(1,160)
Goodwill allocated to disposed businesses				(35)
Acquisition accounting, transfers and other adjustments				(100)
Foreign currency translation adjustments, net				(421)
Ending balance	10,612			10,612
Accumulated goodwill impairment losses	290			290		$ 36
Distribution Solutions
Goodwill [Roll Forward]
Beginning balance				7,987
Goodwill acquired				2,810
Impairment				0
Amount reclassified to assets held for sale				(89)
Goodwill allocated to disposed businesses				(35)
Acquisition accounting, transfers and other adjustments				(100)
Foreign currency translation adjustments, net				(415)
Ending balance	10,158			10,158
Technology Solutions
Goodwill [Roll Forward]
Beginning balance				1,799
Goodwill acquired				22
Impairment		$ (290)		(290)
Amount reclassified to assets held for sale				(1,071)
Goodwill allocated to disposed businesses				0
Acquisition accounting, transfers and other adjustments				0
Foreign currency translation adjustments, net				(6)
Ending balance	$ 454			$ 454