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Settlement Guarantee Management - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016
Settlement Guarantee Management [Abstract] |  |  |
Estimated Maximum Settlement Exposure | $ 68,700 | $ 67,800 |
Covered settlement exposure | 3,000 |  | $ 2,900
Estimated probability-weighted value of the guarantee | $ 2 |  | $ 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 Estimated Maximum Settlement Exposure 1 + References No definition available. + Details
Name: | v_EstimatedMaximumSettlementExposure1
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 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