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Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Dilutive shares of outstanding stock awards included in computation of weighted-average dilutive shares outstanding 2 3 3
Stock options excluded from computation of average dilutive shares outstanding     2
Maximum
     
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Stock options excluded from computation of average dilutive shares outstanding 1 1  
Class B common stock
     
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Weighted average numbers of shares of class B common stock outstanding on an as-converted basis used in the allocation of net income 103 108 123