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Share-based Compensation - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period from the date of grant 10 years    
Share-based compensation expense $ 179 $ 147 $ 154
Total intrinsic value from options exercised 176 247 77
Tax benefit realized from options exercised 59 86 28
Unrecognized compensation cost 15    
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years) 1 year 2 months 12 days    
Total fair value of RSAs and RSUs vested 98 81 55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 8 months 12 days    
Employee Stock Option
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period from the date of grant 3 years    
Restricted Stock Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 117    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 147.18 $ 96.39 $ 79.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 6 months    
Restricted Stock Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 38    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 146.18 $ 96.97 $ 79.97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 3 months 18 days    
Performance Based Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 15    
Weighted average grant date fair value per share $ 164.14 $ 97.84 $ 85.05
Equity Incentive Compensation Plan, 2007 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of Class A Common Stock authorized for issuance under the 2007 Equity Incentive Compensation Plan ("the "EIP") 59