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, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance			$ 10,586
Goodwill acquired			1,258
Acquisition accounting, transfers and other adjustments			34
Goodwill Impairment Charges	$ 0	$ 0	(350)	$ (290)
Goodwill disposed			(124)
Amount reclassified to assets held for sale			(11)
Foreign currency translation adjustments, net			435
Ending balance	11,828		11,828
Distribution Solutions
Goodwill [Roll Forward]
Beginning balance			10,132
Goodwill acquired			1,258
Acquisition accounting, transfers and other adjustments			364
Goodwill Impairment Charges			(350)
Goodwill disposed			0
Amount reclassified to assets held for sale			(11)
Foreign currency translation adjustments, net			435
Ending balance	11,828		11,828
Technology Solutions
Goodwill [Roll Forward]
Beginning balance			454
Goodwill acquired			0
Acquisition accounting, transfers and other adjustments			(330)
Goodwill Impairment Charges			0
Goodwill disposed			(124)
Amount reclassified to assets held for sale			0
Foreign currency translation adjustments, net			0
Ending balance	$ 0		$ 0