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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill [Roll Forward]
Beginning balance			$ 10,586
Goodwill acquired			1,195
Acquisition accounting, transfers and other adjustments			7
Goodwill Impairment Charges	$ (350)	$ (290)	(350)	$ (290)
Amount reclassified to assets held for sale			(124)
Foreign currency translation adjustments, net			418
Ending balance	11,732		11,732
Distribution Solutions
Goodwill [Roll Forward]
Beginning balance			10,132
Goodwill acquired			1,195
Acquisition accounting, transfers and other adjustments			337
Goodwill Impairment Charges			(350)
Amount reclassified to assets held for sale			0
Foreign currency translation adjustments, net			418
Ending balance	11,732		11,732
Technology Solutions
Goodwill [Roll Forward]
Beginning balance			454
Goodwill acquired			0
Acquisition accounting, transfers and other adjustments			(330)
Goodwill Impairment Charges			0
Amount reclassified to assets held for sale			(124)
Foreign currency translation adjustments, net			0
Ending balance	$ 0		$ 0