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Accrued Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Accrued and Other Liabilities [Abstract]      
Accrued operating expenses $ 237 $ 199  
Visa Europe put option-(See Note 2-Visa Europe) [1] 255 145  
Deferred revenue 81 82  
Accrued marketing and product expenses 20 11  
Accrued income taxes-(See Note 19-Income Taxes) 75 73  
Other 200 114  
Total $ 868 624  
Maximum number of days within which the Company is required to purchase the shares of Visa Europe put option 285 days    
Visa Europe purchase price $ 15,000    
Fair value adjustment for the Visa Europe put option $ 110 $ 0 $ 0
[1] the unamended put option was exercisable at any time at the sole discretion of Visa Europe with payment required 285 days thereafter. Classification in current liabilities reflects the fact that the obligation resulting from the exercise of the unamended instrument could become payable within 12 months at September 30, 2015. The fair value of the unamended put option does not represent the actual purchase price that the Company may be required to pay if the option is exercised in its unamended form, which would likely be in excess of $15 billion. During fiscal 2015, we recorded an increase of $110 million in the fair value of the unamended put option. See Note 2—Visa Europe.