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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified | 6 Months Ended
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Mar. 31, 2014 Class A common stock Maximum
Restricted stock instruments settled in cash for taxes shares (in shares) | 1

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