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Collateral (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Settlement Guarantee Management [Abstract] |  |
Cash equivalents | $ 1,490 | $ 1,295
Pledged securities at market value | 167 | 170
Letters of credit | 1,316 | 1,311
Guarantees | 941 | 1,418
Total | $ 3,914 | $ 4,194

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- Definition The Company holds cash deposits from certain customers in order to ensure their performance of settlement obligations arising from credit, debit and travelers cheque product clearings. The cash collateral assets are restricted and fully offset by corresponding liabilities and both balances are presented on the consolidated balance sheet. + References No definition available. + Details
Name: | v_CashCollateralReceived
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Guarantees collateral. + References No definition available. + Details
Name: | v_GuaranteesCollateral
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Letters of credit collateral. + References No definition available. + Details
Name: | v_LettersOfCreditCollateral
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Pledged securities at market value collateral. + References No definition available. + Details
Name: | v_PledgedSecuritiesAtMarketValueCollateral
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure - Settlement Guarantee Management [Abstract] + References No definition available. + Details
Name: | v_SettlementGuaranteeManagementAbstract
Namespace Prefix: | v_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total of cash deposits and non-cash collateral assets including cash equivalents, pledged securities at market value, letters of credit and guarantees. + References No definition available. + Details
Name: | v_TotalCollateral
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant