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Business Combinations - Acquisition of UDG (Details)
€ in Millions, $ in Millions
12 Months Ended
Apr. 01, 2016
EUR (€)
Apr. 01, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]          
Cash purchase consideration     $ 4,237 $ 40 $ 170
Goodwill     10,586 $ 9,786 $ 9,817
UDG          
Business Acquisition [Line Items]          
Cash purchase consideration € 380 $ 431      
Fair value of assets acquired (excluding goodwill and intangibles)     469    
Fair value of liabilities assumed     340    
Goodwill     181    
Increase in goodwill     16    
Customer Relationships | UDG          
Business Acquisition [Line Items]          
Acquired identifiable intangibles     $ 120    
Weighted average life     10 years