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Fair Value Measurements and Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2011
Companhia Brasileira de Solucoes e Servicos [Member]
Sep. 30, 2013
Earn out related to PlaySpan acquisition
Fair Value, Measurements, Recurring
Level 3
Sep. 30, 2012
Earn out related to PlaySpan acquisition
Fair Value, Measurements, Recurring
Level 3
Mar. 02, 2011
Earn out related to PlaySpan acquisition
Pay Span Inc
Fair Value, Measurements, Recurring
Level 3
Investment [Line Items]              
Payment from litigation escrow account-Retrospective Responsibility Plan $ (4,383) $ (140) $ (280)        
Put option, fair value 145 [1] 145 [1]     0 12  
Fair value of earn-put provision             24
Non-marketable equity securities, recognized losses due to impairment 15 2 0        
Non-marketable equity investments 30 86          
Equity method investments reclassified as available-for-sale, carrying value 12            
Available-for-sale securities, previously classified as equity method investments, fair value 99            
Available-for-sale securities, previously classified as equity method investments, unrealized gains 87            
Trading assets, mutual fund investments related to various employee compensation plans 75 66          
Long-term available-for-sale investment securities 2,760 3,283          
Gain on other investments from the sale of equity interest in Visa Vale, pre-tax gain       $ 85      
[1] The put option is exercisable at any time at the sole discretion of Visa Europe with payment required 285 days thereafter. Classification in current liabilities is not an indication of management’s expectation of exercise and simply reflects the fact that the obligation resulting from the exercise of the instrument could become payable within 12 months.