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Settlement Guarantee Management - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) month | Sep. 30, 2016 USD ($)
Settlement Guarantee Management [Abstract] |  |
Number of Rolling Months of Average Chargebacks Volume Included in Settlement Risk Exposure | month | 4 |
Estimated maximum settlement exposure | $ 67,700 | $ 67,800
Covered settlement exposure | 2,800 | 2,900
Estimated probability-weighted value of the guarantee | $ 3 | $ 2

X
- Definition The amount of settlement exposure covered by collateral assets held from certain customers. + References No definition available. + Details
Name: | v_CoveredSettlementExposure
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount represents settlement at risk (or exposure) and is estimated using the average daily volumes during the quarter multiplied by the estimated number of days to settle, and the total balance for outstanding travelers cheques. + References No definition available. + Details
Name: | v_EstimatedMaximumSettlementExposure
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value, as of the date of each statement of financial position presented, of the settlement risk guarantee. + References No definition available. + Details
Name: | v_EstimatedProbabilityWeightedValueOfGuarantee
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of Rolling Months of Average Chargebacks Volume Included in Settlement Risk Exposure + References No definition available. + Details
Name: | v_NumberofRollingMonthsofAverageChargebacksVolumeIncludedinSettlementRiskExposure
Namespace Prefix: | v_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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