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Settlement Guarantee Management - Collateral (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Sep. 30, 2019
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Settlement Guarantee Management [Abstract] |  |
Restricted cash and restricted cash equivalents | $ 1,698 | $ 1,648
Pledged securities at market value | 235 | 259
Letters of credit | 1,300 | 1,293
Guarantees | 508 | 477
Total | $ 3,741 | $ 3,677

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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

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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