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Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) In Millions, unless otherwise specified | Mar. 31, 2014 | Sep. 30, 2013
--- | --- | ---
Schedule of Common Stock as Converted [Line Items] |  |  |
As-converted Class A Common Stock | 629 | [1] |
Class A common stock |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |
Shares Outstanding | 500 |  | 508
Conversion Rate Into Class A Common Stock |  |  |
As-converted Class A Common Stock | 500 | [1] |
Class B common stock |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |
Shares Outstanding | 245 |  | 245
Conversion Rate Into Class A Common Stock | 0.4206 |  |
As-converted Class A Common Stock | 103 | [1] |
Class C common stock |  |  |
Schedule of Common Stock as Converted [Line Items] |  |  |
Shares Outstanding | 26 |  | 27
Conversion Rate Into Class A Common Stock | 1.0000 |  |
As-converted Class A Common Stock | 26 | [1] |
[1] | Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on whole numbers, not the rounded numbers presented.

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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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