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Employee Benefit Plans (Narrative) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plans, expenses not related to ESOP $ 7 $ 7 $ 9
Percentage of company funded under ESOP 100.00%    
Shares allocated under ESOP 108,697    
Compensation expense related to the ESOP 5 4 4
Net loss amortized from accumulated other comprehensive income to net periodic benefit cost 6    
Amortization of estimated prior service credits 3    
Curtailments gain (loss)   1 1
Maximum [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Curtailments gain (loss) 1    
U.S.defined benefit plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 187 140  
Weighted-average assumed health care cost trend rate 8.50%    
Ultimate weighted-average health care cost trend rate 5.00%    
U.S.defined benefit plans [Member] | Equity [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of weighted-average target asset allocation in cash and other securities 61.00%    
U.S.defined benefit plans [Member] | Fixed Income [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of weighted-average target asset allocation in cash and other securities 39.00%    
Foreign Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 398 218  
Weighted-average assumed health care cost trend rate 7.90%    
Ultimate weighted-average health care cost trend rate 6.00%    
Foreign Plans [Member] | Equity [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of weighted-average target asset allocation in cash and other securities 39.00%    
Foreign Plans [Member] | Fixed Income [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of weighted-average target asset allocation in cash and other securities 55.00%    
Foreign Plans [Member] | Cash and other securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of weighted-average target asset allocation in cash and other securities 4.00%    
Foreign Plans [Member] | Real Estate Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of weighted-average target asset allocation in cash and other securities 2.00%    
U.S. Pension Benefits [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Expected contribution 1    
Foreign Pension Benefits [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Expected contribution $ 12