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Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Derivative [Line Items]      
Cash flow hedges in an asset position $ 23    
Cash flow hedges in a liability position 13    
Reduction in earnings from excluded forward points and ineffectiveness 14 16 20
Expected amount of accumulated other comprehensive income (loss) expected to be reclassified 29    
Foreign exchange derivative instruments | Cash Flow Hedging
     
Derivative [Line Items]      
The aggregate notional amount of the Company's foreign currency forward contracts outstanding 1,100 690  
Prepaid Expense and Other Assets Current
     
Derivative [Line Items]      
Collateral posted with counterparties 4    
Accrued Liabilities
     
Derivative [Line Items]      
Collateral received with counterparties $ 14