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Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment — gross $ 7,365    
Property and equipment — gross   $ 7,137  
Less: accumulated depreciation 3,818    
Less: accumulated depreciation   3,958  
Property and equipment, net 3,547    
Property and equipment, net   3,179  
Depreciation 643 820 $ 709
Land, buildings and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment — gross 2,233    
Property and equipment — gross   2,180  
Computers and related equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment — gross 4,876    
Property and equipment — gross   4,719  
Furniture and other equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment — gross 226    
Property and equipment — gross   224  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment — gross $ 30    
Property and equipment — gross   $ 14