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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.