Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2018	Jul. 20, 2018
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-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A common stock
Entity Common Stock, Shares Outstanding		1,776,658,361
Class B common stock
Entity Common Stock, Shares Outstanding		245,513,385
Class C common stock
Entity Common Stock, Shares Outstanding		12,079,719