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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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