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Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Goodwill [Roll Forward]      
Goodwill, beginning balance $ 10,586 $ 9,786  
Goodwill acquired 1,707 2,858  
Acquisition accounting, transfers and other adjustments 39 (145)  
Goodwill impairment (1,738) (290) $ 0
Amount reclassified to assets held for sale (2) (165)  
Goodwill disposed (172) (1,108)  
Foreign currency translation adjustments, net 504 (350)  
Goodwill, ending balance 10,924 10,586 9,786
Distribution Solutions      
Goodwill [Roll Forward]      
Goodwill, beginning balance 10,132 7,987  
Goodwill acquired 1,707 2,836  
Acquisition accounting, transfers and other adjustments 369 (146)  
Goodwill impairment (1,738) 0  
Amount reclassified to assets held for sale (2) (165)  
Goodwill disposed (48) (30)  
Foreign currency translation adjustments, net 504 (350)  
Goodwill, ending balance 10,924 10,132 7,987
Technology Solutions      
Goodwill [Roll Forward]      
Goodwill, beginning balance 454 1,799  
Goodwill acquired 0 22  
Acquisition accounting, transfers and other adjustments (330) 1  
Goodwill impairment 0 (290)  
Amount reclassified to assets held for sale 0 0  
Goodwill disposed (124) (1,078)  
Foreign currency translation adjustments, net 0 0  
Goodwill, ending balance $ 0 $ 454 $ 1,799