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Document and Entity Information Document - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Nov. 09, 2016
Mar. 31, 2016
Entity Information [Line Items]      
Entity Registrant Name VISA INC.    
Entity Central Index Key 0001403161    
Current Fiscal Year End Date --09-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Sep. 30, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 145,500
Class A common stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,867,580,597  
Class B common stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   245,513,385  
Class C common stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   16,814,896