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Share-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 53 $ 67 $ 62
Capitalized share-based compensation 0 0 0
Total fair value of RSAs and RSUs vested $ 183 163 142
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Vesting period from the date of grant 3 years    
Total intrinsic value from options exercised $ 249 178 103
Tax Benefit from Exercise of Stock Options 55 $ 62 $ 35
Unrecognized compensation cost $ 22    
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years) 7 months 6 days    
Weighted average remaining contractual term 6 years 11 months 9 days    
Restricted Stock      
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]      
Weighted average grant date fair value (in dollars per share) $ 0.00    
Shares granted 0 0 0
Weighted average remaining contractual term 0 years    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 284    
Weighted average grant date fair value (in dollars per share) $ 111.11 $ 81.67 $ 79.77
Shares granted 2,832,984    
Weighted average remaining contractual term 10 months 17 days    
Performance Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value (in dollars per share) [1] $ 120.11 $ 86.37 $ 92.71
Shares granted [1] 641,498    
Weighted average remaining contractual term 11 months 9 days    
Performance Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period from the date of grant 3 years 3 years 3 years
Unrecognized compensation cost $ 54    
Equity Incentive Compensation Plan, 2007      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of Class A Common Stock authorized for issuance under EIP or ESPP 236,000,000    
Share-based compensation expense under EIP $ 312 $ 224 $ 211
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of Class A Common Stock authorized for issuance under EIP or ESPP 20,000,000    
ESPP discount from market price 15.00%    
[1] Represents the maximum number of performance-based shares which could be earned.