Selected Quarterly Financial Data (Detail) (USD $) In Millions, except Per Share data	3 Months Ended								12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2009
Quarterly Financial Information [Line Items]
Operating revenues	$ 2,383	$ 2,322	$ 2,245	$ 2,238	$ 2,117	$ 2,029	$ 1,959	$ 1,960	$ 9,188		$ 8,065		$ 6,911
Operating income	1,362	1,345	1,383	1,366	1,113	1,137	1,122	1,217	5,456		4,589		3,538
Net income attributable to Visa Inc.	880	1,005	881	884	774	716	713	763	3,650		2,966		2,353
Class A common stock
Quarterly Financial Information [Line Items]
Net income attributable to Visa Inc.									2,638		1,940		1,397
Basic earnings per share	$ 1.28	$ 1.43	$ 1.24	$ 1.23	$ 1.06	$ 0.97	$ 0.97	$ 1.03	$ 5.18	[1]	$ 4.03	[1]	$ 3.10	[1]
Diluted earnings per share	$ 1.27	$ 1.43	$ 1.23	$ 1.23	$ 1.06	$ 0.97	$ 0.96	$ 1.02	$ 5.16	[1]	$ 4.01	[1]	$ 3.10	[1]
Class B common stock
Quarterly Financial Information [Line Items]
Net income attributable to Visa Inc.									636	[2]	566	[2]	485	[2]
Basic earnings per share	$ 0.62	$ 0.70	$ 0.63	$ 0.63	$ 0.59	$ 0.56	$ 0.56	$ 0.60	$ 2.59	[1]	$ 2.31	[1]	$ 1.98	[1]
Diluted earnings per share	$ 0.62	$ 0.70	$ 0.63	$ 0.63	$ 0.59	$ 0.55	$ 0.56	$ 0.60	$ 2.58	[1]	$ 2.30	[1]	$ 1.98	[1]
Class C common stock
Quarterly Financial Information [Line Items]
Net income attributable to Visa Inc.									$ 364		$ 451		$ 460
Basic earnings per share	$ 1.28	$ 1.43	$ 1.24	$ 1.23	$ 1.06	$ 0.97	$ 0.97	$ 1.03	$ 5.18	[1]	$ 4.03	[1]	$ 3.10	[1]
Diluted earnings per share	$ 1.27	$ 1.43	$ 1.23	$ 1.23	$ 1.06	$ 0.97	$ 0.96	$ 1.02	$ 5.16	[1]	$ 4.01	[1]	$ 3.10	[1]

[1] Earnings per share calculated based on whole numbers, not rounded numbers.

[2] Net income attributable to Visa Inc. is allocated to each class of common stock on an as-converted basis. The weighted average numbers of shares of as-converted class B common stock used in the income allocation were 123 million, 141 million and 157 million for fiscal 2011, 2010 and 2009, respectively.