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Collateral (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Business Acquisition [Line Items] |  |
Cash equivalents(1) | $ 1,283 | $ 1,295
Pledged securities at market value | 166 | 170
Letters of credit | 1,328 | 1,311
Guarantees | 1,443 | 1,418
Total | $ 4,220 | $ 4,194

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Collateral Assets + References No definition available. + Details
Name: | v_CollateralAssets
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Customer Collateral Assets, Including Collateral Held by Subsidiary + References No definition available. + Details
Name: | v_CustomerCollateralAssetsIncludingCollateralHeldbySubsidiary
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