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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Investment securities |  |  |
Trading |  | $ 71 | $ 66
Available-for-sale securities |  | 7,179 | 5,815
Accrued liabilities |  |  |
Visa Europe put option | [1] | 0 | 255
Fair Value, Measurements, Recurring | Level 1 |  |  |
Investment securities |  |  |
Fair value, total assets |  | 6,839 | 5,777
Accrued liabilities |  |  |
Fair value, total liabilities |  | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |  |
Cash equivalents and restricted cash |  |  |
Cash equivalents and restricted cash |  | 4,537 | 3,051
Fair Value, Measurements, Recurring | Level 1 | Equity securities |  |  |
Investment securities |  |  |
Trading |  | 71 | 66
Available-for-sale securities |  | 53 | 4
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities |  |  |
Investment securities |  |  |
Available-for-sale securities |  | 2,178 | 2,656
Fair Value, Measurements, Recurring | Level 2 |  |  |
Investment securities |  |  |
Fair value, total assets |  | 5,200 | 3,504
Accrued liabilities |  |  |
Fair value, total liabilities |  | 136 | 13
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored agency debt securities |  |  |
Cash equivalents and restricted cash |  |  |
Cash equivalents and restricted cash |  | 196 | 280
Investment securities |  |  |
Available-for-sale securities |  | 4,699 | 2,615
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities |  |  |
Investment securities |  |  |
Available-for-sale securities |  | 249 | 533
Fair Value, Measurements, Recurring | Level 3 |  |  |
Investment securities |  |  |
Fair value, total assets |  | 0 | 7
Accrued liabilities |  |  |
Fair value, total liabilities |  | 0 | 255
Fair Value, Measurements, Recurring | Level 3 | Visa Europe put option |  |  |
Accrued liabilities |  |  |
Visa Europe put option |  | 0 | 255
Fair Value, Measurements, Recurring | Level 3 | Auction Rate Securities |  |  |
Investment securities |  |  |
Available-for-sale securities |  | 0 | 7
Prepaid Expenses and Other Current Assets [Member] | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |  |
Investment securities |  |  |
Foreign exchange derivative instruments |  | 50 | 76
Other Assets | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |  |
Investment securities |  |  |
Foreign exchange derivative instruments |  | 6 |
Accrued Liabilities | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |  |
Accrued liabilities |  |  |
Foreign exchange derivative instruments |  | 116 | $ 13
Other Liabilities | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative instruments |  |  |
Accrued liabilities |  |  |
Foreign exchange derivative instruments |  | $ 20 |
[1] | On June 21, 2016, the Company acquired 100% of the share capital of Visa Europe, effected by the Visa Europe board of directors' exercise of the amended Visa Europe put option. Therefore, the Visa Europe put option was contractually terminated as a result of the transaction. See Note 2—Acquisition of Visa Europe.

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