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Fair Value Measurements and Investments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Feb. 01, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Fair Value Measurements and Investments [Abstract]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount   $ 0    
Put option, fair value [1]   255 $ 145  
Other-than-temporary Impairment Losses Realized   5 3 $ 15
Non-marketable equity investments   45 35  
Goodwill and intangible asset impairment $ 0      
Non-marketable equity securities, recognized losses due to impairment       $ 0
Trading assets, mutual fund investments related to various employee compensation plans   66 69  
Long-term available-for-sale investment securities   $ 3,384 $ 3,015  
[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.