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Collateral (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Sep. 30, 2013
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Settlement Guarantee Management [Abstract] |  |
Cash equivalents | $ 923 | $ 866
Pledged securities at market value | 191 | 256
Letters of credit | 1,184 | 1,191
Guarantees | 1,372 | 1,411
Total | $ 3,670 | $ 3,724

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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 The Company holds cash deposits and other noncash assets 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. Noncash collateral assets are held on behalf of the Company by a third party and are not recorded on the Company's consolidated balance sheet. + References No definition available. + Details
Name: | v_CustomerCollateralAssets
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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- Details
Name: | v_SettlementGuaranteeManagementAbstract
Namespace Prefix: | v_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration