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Goodwill and Intangible Assets, Net - Goodwill Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Distribution Solutions    
Goodwill [Line Items]    
Accumulated goodwill impairment loss $ 1,755  
Technology Solutions    
Goodwill [Line Items]    
Accumulated goodwill impairment loss   $ 290