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Share-based Compensation - Additional Information (Detail)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
$ / shares
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of options issued under EIP (in years) 10 years    
Total intrinsic value from options exercised $ 185 $ 134 $ 56
Tax benefit from exercise of stock options 28 $ 28 $ 11
Unrecognized compensation cost $ 27    
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years) 5 months 1 day    
Vesting period from the date of grant (in years) 3 years    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 796    
Vesting period from the date of grant (in years) 3 years    
Number of shares of common stock issued for each award 1    
Weighted average grant date fair value (in dollars per share) | $ / shares $ 253.29 $ 212.94 $ 204.73
Total grant date fair value of shares vested and earned $ 616 $ 486 $ 380
Weighted-average period (in years) 11 months 4 days    
Performance-based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 75    
Vesting period from the date of grant (in years) 3 years    
Weighted average grant date fair value (in dollars per share) | $ / shares $ 281.85    
Total grant date fair value of shares vested and earned $ 81 44 49
Weighted-average period (in years) 10 months 17 days    
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) | shares 198    
Share-based compensation expense under EIP $ 817 734 571
Tax benefit under EIP $ 128 $ 112 $ 82