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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) - USD ($) $ in Billions | 6 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Statement of Cash Flows [Abstract] |  |
Cash paid for transferable tax credits | $ 1.8 | $ 1.3

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Income Taxes Paid, Federal Tax Credits + References No definition available. + Details
Name: | v_IncomeTaxesPaidFederalTaxCredits
Namespace Prefix: | v_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration