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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified | 9 Months Ended
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Jun. 30, 2014 Class A common stock Common Stock Maximum
Restricted stock and performance-based shares settled in cash for taxes (in shares) | 1

X
- Definition Restricted Stock Instrument Settled in Cash for Taxes, Shares + References No definition available. + Details
Name: | v_RestrictedStockInstrumentsSettledInCashForTaxesShares
Namespace Prefix: | v_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration