Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)			$ 1,270	[1],[2],[3]
Net loss attributable to Visa Inc.	1,598	[2],[3]			3,005	[2],[3]	2,563
Class A common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	1,266	[2],[3]	1,011	[2],[3]	2,381	[2],[3]	2,041
Weighted- Average Shares Outstanding (B)	501	[2]	524	[2]	503		528
Earnings per Share (A)/(B)	$ 2.53	[2]	$ 1.93	[2]	$ 4.74		$ 3.87
Income Allocation (A)	1,598	[2],[3]	1,270	[2],[3]	3,005	[2],[3]	2,563
Weighted- Average Shares Outstanding (B)	634	[2],[4]	660	[2],[4]	636		665
Earnings per Share (A)/(B)	$ 2.52	[2]	$ 1.92	[2]	$ 4.72		$ 3.86
Class B common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	261	[2],[3]	199	[2],[3]	489	[2],[3]	399
Weighted- Average Shares Outstanding (B)	245	[2]	245	[2]	245		245
Earnings per Share (A)/(B)	$ 1.06	[2]	$ 0.81	[2]	$ 1.99		$ 1.63
Income Allocation (A)	260	[2],[3]	199	[2],[3]	488	[2],[3]	398
Weighted- Average Shares Outstanding (B)	245	[2]	245	[2]	245		245
Earnings per Share (A)/(B)	$ 1.06	[2]	$ 0.81	[2]	$ 1.99		$ 1.62
Class C common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	66	[2],[3]	55	[2],[3]	125	[2],[3]	113
Weighted- Average Shares Outstanding (B)	26	[2]	28	[2]	26		29
Earnings per Share (A)/(B)	$ 2.53	[2]	$ 1.93	[2]	$ 4.74		$ 3.87
Income Allocation (A)	65	[2],[3]	55	[2],[3]	124	[2],[3]	112
Weighted- Average Shares Outstanding (B)	26	[2]	28	[2]	26		29
Earnings per Share (A)/(B)	$ 2.52	[2]	$ 1.92	[2]	$ 4.72		$ 3.86
Participating securities
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	5	[1],[2],[3]	5	[1],[2],[3]	10	[1],[2],[3]	10
Income Allocation (A)	$ 5	[1],[2],[3]	$ 5	[1],[2],[3]	$ 10	[1],[2],[3]	$ 10

[1] 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.

[2] 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.

[3] Net income is allocated based on proportional ownership on an as-converted basis. The weighted-average number of shares of as-converted class B common stock used in the income allocation was 103 million for the three and six months ended March 31, 2014 and 2013.

[4] 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 approximately 2 million of common stock equivalents for the three and six months ended March 31, 2014 and 2013, because their effect would be dilutive. The calculation excludes less than 1 million of common stock equivalents for the three and six months ended March 31, 2014 and 2013, because their effect would have been anti-dilutive.