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Fair Value Measurements and Investments Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (Fair Value, Measurements, Recurring, USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Accrued liabilities    
Visa Europe put option $ 145 $ 145
Level 1
   
Prepaid and other current assets    
Fair value, total assets 1,687 6,810
Accrued liabilities    
Fair value, total liabilities 0 0
Level 1 | U.S. Treasury securities
   
Investment securities, trading    
Available-for-sale securities 1,075 1,066
Level 1 | Equity securities
   
Investment securities, trading    
Trading securities 72 66
Available-for-sale securities 63 2
Level 1 | Money market funds
   
Cash equivalents and restricted cash    
Cash equivalents and restricted cash 477 5,676
Level 2
   
Prepaid and other current assets    
Fair value, total assets 3,151 2,990
Accrued liabilities    
Fair value, total liabilities 17 11
Level 2 | U.S. government-sponsored debt securities
   
Investment securities, trading    
Available-for-sale securities 2,737 2,821
Level 2 | Corporate debt securities
   
Investment securities, trading    
Available-for-sale securities 362 63
Level 2 | Foreign exchange derivative instruments
   
Prepaid and other current assets    
Foreign exchange derivative instruments 18 13
Accrued liabilities    
Foreign exchange derivative instruments 17 11
Level 2 | Commercial paper
   
Cash equivalents and restricted cash    
Cash equivalents and restricted cash 34 93
Level 3
   
Prepaid and other current assets    
Fair value, total assets 7 7
Accrued liabilities    
Fair value, total liabilities 145 157
Level 3 | Auction rate securities
   
Investment securities, trading    
Available-for-sale securities 7 7
Level 3 | Visa Europe put option
   
Accrued liabilities    
Visa Europe put option 145 145
Level 3 | Earn-out related to PlaySpan acquisition
   
Accrued liabilities    
Earn-out related to PlaySpan acquisition $ 0 $ 12