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Business Combinations - Other Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2018
Business Acquisition [Line Items]        
Cash purchase consideration $ 905 $ 2,893 $ 4,212  
Goodwill $ 9,358 10,924 $ 10,586  
intraFUSION, BDI Pharma, LLC, and Uniprix Group        
Business Acquisition [Line Items]        
Cash purchase consideration   $ 485    
Fair value of assets acquired (excluding goodwill and intangibles)       $ 292
Fair value of liabilities assumed       160
Goodwill       246
Acquired identifiable intangibles       $ 118