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Document and Entity Information
 3 Months Ended
Dec. 31, 2014
Jan. 23, 2015
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 Dec. 31, 2014  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Class A common stock    
Entity Common Stock, Shares Outstanding   490,962,259dei_EntityCommonStockSharesOutstanding
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= us-gaap_CommonClassAMember
Class B common stock    
Entity Common Stock, Shares Outstanding   245,513,385dei_EntityCommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Class C common stock    
Entity Common Stock, Shares Outstanding   21,762,506dei_EntityCommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember