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Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail)
 12 Months Ended
Sep. 30, 2016
conversion_rate
shares
Sep. 30, 2016
conversion_rate
shares
Sep. 30, 2015
shares
Jun. 21, 2016
shares
Mar. 19, 2015
conversion_rate
Class of Stock [Line Items]          
Stock Repurchased and Retired During Period, Shares 1,000,000        
Conversion of class C common stock upon sale into public market (in shares) [1] 2,422,000,000        
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock       13.952  
Series B Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, shares outstanding 2,000,000 2,000,000 0    
preferred stock series B conversion rate | conversion_rate 13.9520 13.9520      
Shares Outstanding As Converted Basis [1] 35,000,000 35,000,000      
Series C Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, shares outstanding 3,000,000 3,000,000 0    
Shares Outstanding As Converted Basis [1] 44,000,000 44,000,000      
preferred stock series C conversion rate | conversion_rate 13.9520 13.9520      
Class A common stock          
Class of Stock [Line Items]          
Stock Repurchased and Retired During Period, Shares [3]   91,000,000 [2] 44,000,000    
Common stock, shares, outstanding 1,871,000,000 [4] 1,871,000,000 [4] 1,950,000,000    
Conversion of class C common stock upon sale into public market (in shares) [1],[4] 1,871,000,000        
Class B common stock          
Class of Stock [Line Items]          
Common stock, shares, outstanding 245,000,000 245,000,000 245,000,000    
Common stock, conversion rate | conversion_rate [5] 1.6483 1.6483     1.6483
Conversion of class C common stock upon sale into public market (in shares) [1] 405,000,000        
Class C common stock          
Class of Stock [Line Items]          
Common stock, shares, outstanding 17,000,000 17,000,000 20,000,000 550,000  
Common stock, conversion rate | conversion_rate 4.0000 4.0000     4.0
Conversion of class C common stock upon sale into public market (in shares) [1] 67,000,000        
Visa Europe          
Class of Stock [Line Items]          
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock       13.952  
[1] Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on unrounded numbers.
[2] (in millions, except per share data)2016 (1) 2015Shares repurchased in the open market(2)91 44Average repurchase price per share(3)$77.05 $65.98Total cost$6,987 $2,910
[3] All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
[4] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVhOWM1MDkzNjQ1MjRmNzk4OTM0M2I5ZDEyODM0M2JlfFRleHRTZWxlY3Rpb246OENBNzc3NzIxMjY1M0Y0NTY4MDI2RUY3NTNDRjY1NjMM}
[5] The class B to class A common stock conversion rate is presented on a rounded basis. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.