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Restructuring and Asset Impairment Charges - Summary of Activity Related to Restructuring Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Cost Alignment Plan      
Beginning balance $ 106 $ 222  
Net restructuring charges recognized 13 14 $ 229
Non-cash charges 0 (9)  
Cash Payments (45) (106)  
Other (5) (15)  
Ending balance 69 106 222
Operating Segments | Distribution Solutions      
Cost Alignment Plan      
Beginning balance 90 156  
Net restructuring charges recognized 13 19 161
Non-cash charges 0 (10)  
Cash Payments (36) (67)  
Other (3) (8)  
Ending balance 64 90 156
Operating Segments | Technology Solutions      
Cost Alignment Plan      
Beginning balance 10 45  
Net restructuring charges recognized 0 (10) 51
Non-cash charges 0 0  
Cash Payments (4) (20)  
Other (6) (5)  
Ending balance 0 10 45
Corporate      
Cost Alignment Plan      
Beginning balance 6 21  
Net restructuring charges recognized 0 5 17
Non-cash charges 0 1  
Cash Payments (5) (19)  
Other 4 (2)  
Ending balance $ 5 $ 6 $ 21