Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Name Accounting Standards Codification

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+ Details

Basic and Diluted Earnings Per Share (Parenthetical) (Detail) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Stock options included in the computation of diluted shares outstanding	2		2	3
Stock Options
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Stock options excluded from computation of average dilutive shares outstanding		7
Stock Options \| Maximum
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Stock options excluded from computation of average dilutive shares outstanding	1		1	1
Class B common stock
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Weighted-average as-converted class B common stock used in income allocation	103	104	103	110