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Cover - USD ($)
$ in Billions
12 Months Ended
Sep. 30, 2019
Nov. 08, 2019
Mar. 29, 2019
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2019    
Document Transition Report false    
Entity File Number 001-33977    
Entity Registrant Name VISA INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-0267673    
Entity Address, Address Line One P.O. Box 8999    
Entity Address, Postal Zip Code 94128-8999    
Entity Address, City or Town San Francisco,    
Entity Address, State or Province CA    
City Area Code 650    
Local Phone Number 432-3200    
Title of 12(b) Security Class A Common Stock, par value $0.0001 per share    
Trading Symbol V    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 272.0
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Registrant’s Proxy Statement for the 2020 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the Registrant’s fiscal year ended September 30, 2019.
   
Entity Central Index Key 0001403161    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,712,677,044  
Class B common stock      
Document Information [Line Items]      
Title of 12(g) Security Class B common stock, par value $0.0001 per share    
Entity Common Stock, Shares Outstanding   245,513,385  
Class C common stock      
Document Information [Line Items]      
Title of 12(g) Security Class C common stock, par value $0.0001 per share    
Entity Common Stock, Shares Outstanding   11,133,345