Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Income allocation - Basic	$ 4,980	[1]	$ 2,144	[1]	$ 3,650	[1]
Class A common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Income allocation - Basic	3,959	[1]	1,664	[1]	2,638	[1]
Weighted Average Shares Outstanding - Basic	520		524		509
Earnings per Share - Basic	$ 7.61	[2]	$ 3.17	[2]	$ 5.18	[2]
Income allocation - Diluted	4,980		2,144	[1]	3,650	[1]
Weighted Average Shares Outstanding - Diluted	656		678	[3]	707	[3]
Earnings per Share - Diluted	$ 7.59	[2]	$ 3.16	[2]	$ 5.16	[2]
Class B common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Income allocation - Basic	786	[1]	343	[1]	636	[1]
Weighted Average Shares Outstanding - Basic	245		245		245
Earnings per Share - Basic	$ 3.20	[2]	$ 1.40	[2]	$ 2.59	[2]
Income allocation - Diluted	784	[1]	341	[1]	633	[1]
Weighted Average Shares Outstanding - Diluted	245		245		245
Earnings per Share - Diluted	$ 3.19	[2]	$ 1.39	[2]	$ 2.58	[2]
Class C common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Income allocation - Basic	216	[1]	130	[1]	364	[1]
Weighted Average Shares Outstanding - Basic	28		41		70
Earnings per Share - Basic	$ 7.61	[2]	$ 3.17	[2]	$ 5.18	[2]
Income allocation - Diluted	215	[1]	129	[1]	363	[1]
Weighted Average Shares Outstanding - Diluted	28		41		70
Earnings per Share - Diluted	$ 7.59	[2]	$ 3.16	[2]	$ 5.16	[2]
Participating Securities
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Income allocation - Basic	19	[1],[4]	7	[1],[4]	12	[1],[4]
Income allocation - Diluted	$ 19	[1],[4]	$ 7	[1],[4]	$ 12	[1],[4]

[1] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on whole numbers, not the rounded numbers presented.

[2] Net income attributable to Visa Inc. is allocated based on proportional ownership on an as-converted basis. The weighted-average numbers of shares of as-converted class B common stock used in the income allocation were 103 million, 108 million and 123 million for fiscal 2013, 2012 and 2011, respectively.

[3] Weighted-average diluted shares outstanding are calculated on an as-converted basis, and include incremental common stock equivalents, as calculated under the treasury stock method. The computation includes 2 million common stock equivalents for fiscal 2013 and 3 million for fiscal 2012 and fiscal 2011, because their effect would have been dilutive. The computation excludes less than 1 million of common stock equivalents for fiscal 2013 and 2012, and 2 million for fiscal 2011 because their effect would have been anti-dilutive.

[4] Participating securities are unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents, such as the Company's restricted stock awards, restricted stock units and earned performance-based shares.