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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Installment
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit recognized $ 40 $ 35 $ 32
SARs vesting period 4 years    
SARs terms of award 10 years    
Total intrinsic value of SARs exercised 69 54 4
Stock Issued under SARs exercised 610    
Actual tax benefit realized for tax deductions from SAR 26 19 3
Total fair value of SARs vested 25 30 37
Outstanding stock options term of award 10 years    
Cash received from the exercising of stock options 17 64 52
Actual tax benefit realized for tax deductions from stock option exercises 7 21 12
Total intrinsic value of stock options exercised 21 65 58
Stock units vesting period 3 years    
Unrecognized compensation expense for all non-vested share-based awards 108    
Weighted-average remaining life non-vested share-based awards 1 year 10 months 21 days    
Shares were authorized for future grants 9,051    
Distribution of each award is deferred until after retirement or involuntary termination 25% or more    
Number of equal installments in which deferred portion of stock award is distributable 5    
Period over which balance of stock award distributable, (years) 5 years    
Outstanding shares under other stock plan 58 73  
Shares issuable under deferred compensation plan 360    
Director [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferral plan, shares held in trust 109    
Shares represented Directors' compensation in 2014 2    
Performance-Based Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation arrangement by share based payment award The actual payout under these awards may vary from zero to 200% of an employee's target payout, based on the Company's actual performance over the three-year performance period.    
Granted, Stock Units Weighted Average Grant Date Fair Value $ 110.58 $ 72.14 $ 72.12
Total fair value of restricted stock units 10   7
Weighted average remaining vesting term 1 year 1 month 10 days    
Time-Vested Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Stock Units Weighted Average Grant Date Fair Value   $ 70.99 $ 72.27
Total fair value of restricted stock units $ 45 $ 52 $ 38
Weighted average remaining vesting term 1 year 1 month 6 days