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Share-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of options issued under EIP (in years) 10 years    
Vesting period from the date of grant (in years) 3 years    
Total intrinsic value from options exercised $ 134 $ 56 $ 124
Tax benefit from exercise of stock options 28 $ 11 $ 23
Unrecognized compensation cost $ 25    
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years) 4 months 17 days    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period from the date of grant (in years) 3 years    
Unrecognized compensation cost $ 745    
Weighted average grant date fair value (in dollars per share) $ 212.94 $ 204.73 $ 209.00
Total grant date fair value of shares vested and earned $ 486 $ 380 $ 331
Weighted-average period (in years) 11 months 15 days    
Performance-based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period from the date of grant (in years) 3 years    
Unrecognized compensation cost $ 81    
Weighted average grant date fair value (in dollars per share) $ 221.32    
Total grant date fair value of shares vested and earned $ 44 49 47
Weighted-average period (in years) 1 year    
2007 Equity Incentive Compensation 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 (in shares) 198    
Share-based compensation expense under EIP $ 734 571 518
Tax benefit under EIP $ 112 $ 82 $ 73