Expected Reduction of Revenue for Volume and Support Incentive Agreements (Detail) $ in Millions	12 Months Ended
Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Client incentives, 2017	$ 4,211
Client incentives, 2018	3,752
Client incentives, 2019	3,211
Client incentives, 2020	2,628
Client incentives, 2021	2,245
Client incentives, Thereafter	4,617
Client incentives	$ 20,664

No definition available.

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Expected Reduction Of Volume And Support Incentives

No definition available.

Name:	v_ExpectedReductionOfVolumeAndSupportIncentives
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Expected Reduction Of Volume And Support Incentives Thereafter

No definition available.

Name:	v_ExpectedReductionOfVolumeAndSupportIncentivesThereafter
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Expected Reduction Of Volume And Support Incentives Year Five

No definition available.

Name:	v_ExpectedReductionOfVolumeAndSupportIncentivesYearFive
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Expected Reduction Of Volume And Support Incentives Year Four

No definition available.

Name:	v_ExpectedReductionOfVolumeAndSupportIncentivesYearFour
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Expected Reduction Of Volume And Support Incentives Year One

No definition available.

Name:	v_ExpectedReductionOfVolumeAndSupportIncentivesYearOne
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Expected Reduction Of Volume And Support Incentives Year Three

No definition available.

Name:	v_ExpectedReductionOfVolumeAndSupportIncentivesYearThree
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Expected Reduction Of Volume And Support Incentives Year Two

No definition available.

Name:	v_ExpectedReductionOfVolumeAndSupportIncentivesYearTwo
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration