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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, 2014

Dec. 31, 2013

Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]

Net loss attributable to Visa Inc.

$ 1,569us-gaap_NetIncomeLoss

^[1],[2]

$ 1,407us-gaap_NetIncomeLoss

^[1],[2],[3]

Class A common stock

Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]

Income Allocation (A)

1,253us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

^[1],[2]

1,115us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

^[1],[2]

Weighted- Average Shares Outstanding (B)

494us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

505us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

Earnings per Share (A)/(B)

$ 2.54us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

$ 2.21us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

Income Allocation (A)

1,569us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

^[1],[2]

1,407us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

^[1],[2]

Weighted- Average Shares Outstanding (B)

619us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

639us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

Earnings per Share (A)/(B)

$ 2.53us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

$ 2.20us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember

Class B common stock

Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]

Income Allocation (A)

257us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

^[1],[2]

228us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

^[1],[2]

Weighted- Average Shares Outstanding (B)

245us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

245us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

Earnings per Share (A)/(B)

$ 1.05us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

$ 0.93us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

Income Allocation (A)

257us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

^[1],[2]

228us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

^[1],[2]

Weighted- Average Shares Outstanding (B)

245us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

245us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

Earnings per Share (A)/(B)

$ 1.04us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

$ 0.93us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember

Class C common stock

Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]

Income Allocation (A)

55us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

^[1],[2]

59us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

^[1],[2]

Weighted- Average Shares Outstanding (B)

22us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

27us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

Earnings per Share (A)/(B)

$ 2.54us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

$ 2.21us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
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Income Allocation (A)

55us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

^[1],[2]

59us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
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^[1],[2]

Weighted- Average Shares Outstanding (B)

22us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

27us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

Earnings per Share (A)/(B)

$ 2.53us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

$ 2.20us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember

Participating securities

Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]

Income Allocation (A)

4us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= v_ParticipatingSecuritiesMember

^[1],[2],[3]

5us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= v_ParticipatingSecuritiesMember

^[1],[2],[3]

Income Allocation (A)

$ 4us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= v_ParticipatingSecuritiesMember

^[1],[2],[3]

$ 5us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= v_ParticipatingSecuritiesMember

^[1],[2],[3]

[1]	Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.
[2]	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 101 million and 103 million for the three months ended December 31, 2014 and 2013, respectively.
[3]	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.

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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