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Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Sep. 30, 2011	Mar. 31, 2011	Nov. 10, 2011 Class A common stock	Nov. 10, 2011 Class B common stock	Nov. 10, 2011 Class C common stock
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Trading Symbol	V
Entity Registrant Name	VISA INC.
Entity Central Index Key	0001403161
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$ 38,200,000,000
Entity Common Stock, Shares Outstanding			521,531,709	245,513,385	45,902,192