Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net loss attributable to Visa Inc.	$ 1,407	[1],[2]	$ 1,293	[1],[2]
Class A common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	1,115	[1],[2]	1,031	[1],[2]
Weighted- Average Shares Outstanding (B)	505	[2]	531	[2]
Earnings per Share (A)/(B)	$ 2.21	[2]	$ 1.94	[2]
Income Allocation (A)	1,407	[1],[2]	1,293	[1],[2]
Weighted- Average Shares Outstanding (B)	639	[2],[3]	669	[2],[3]
Earnings per Share (A)/(B)	$ 2.20	[2]	$ 1.93	[2]
Class B common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	228	[1],[2]	200	[1],[2]
Weighted- Average Shares Outstanding (B)	245	[2]	245	[2]
Earnings per Share (A)/(B)	$ 0.93	[2]	$ 0.82	[2]
Income Allocation (A)	228	[1],[2]	200	[1],[2]
Weighted- Average Shares Outstanding (B)	245	[2]	245	[2]
Earnings per Share (A)/(B)	$ 0.93	[2]	$ 0.81	[2]
Class C common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	59	[1],[2]	57	[1],[2]
Weighted- Average Shares Outstanding (B)	27	[2]	30	[2]
Earnings per Share (A)/(B)	$ 2.21	[2]	$ 1.94	[2]
Income Allocation (A)	59	[1],[2]	57	[1],[2]
Weighted- Average Shares Outstanding (B)	27	[2]	30	[2]
Earnings per Share (A)/(B)	$ 2.20	[2]	$ 1.93	[2]
Participating securities
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income Allocation (A)	5	[1],[2],[4]	5	[1],[2],[4]
Income Allocation (A)	$ 5	[1],[2],[4]	$ 5	[1],[2],[4]

[1] 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 months ended December 31, 2013 and December 31, 2012.

[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] 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 of common stock equivalents for the three months ended December 31, 2013 and December 31, 2012, because their effect would be dilutive. The calculation excludes less than 1 million of common stock equivalents for the three months ended December 31, 2013 and December 31, 2012 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.