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Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) In Millions, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014
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Schedule of Common Stock as Converted [Line Items] |  |  |
As-converted Class A Common Stock | 616 v_SharesOutstandingAsConvertedBasis | [1] |
Class A common stock |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |
Shares Outstanding | 495 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 495 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
As-converted Class A Common Stock | 495 v_SharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [1] |
Class B common stock |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |
Shares Outstanding | 245 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 245 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Conversion Rate Into Class A Common Stock | 0.4121 v_CommonStockConversionRate / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] |
As-converted Class A Common Stock | 101 v_SharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [1] |
Class C common stock |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |
Shares Outstanding | 20 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassCMember |  | 22 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassCMember
Conversion Rate Into Class A Common Stock | 1.0000 v_CommonStockConversionRate / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassCMember |  |
As-converted Class A Common Stock | 20 v_SharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassCMember | [1] |
[1] | Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on unrounded numbers.
[2] | The class B to class A common stock conversion rate has been rounded for purposes of this disclosure. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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