Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail)
In Millions, unless otherwise specified |
12 Months Ended | ||||
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Sep. 30, 2013
conversion_rate
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Sep. 30, 2012
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Class of Stock [Line Items] | |||||
As-converted Class A Common Stock | 638 | [1] | |||
Class A common stock
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Class of Stock [Line Items] | |||||
Common stock, shares, outstanding | 508 | 535 | |||
Conversion Rate Into Class A Common Stock | 0 | ||||
As-converted Class A Common Stock | 508 | [1] | |||
Class B common stock
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Class of Stock [Line Items] | |||||
Common stock, 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
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Class of Stock [Line Items] | |||||
Common stock, shares, outstanding | 27 | 31 | |||
Conversion Rate Into Class A Common Stock | 1.0000 | ||||
As-converted Class A Common Stock | 27 | [1] | |||
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