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Shareholders' Equity - Changes in Certain Components of Shareholders' Equity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Jun. 01, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 25,890      
Beginning balance (shares) (81,493,082)      
Net Income $ 1,678 $ 1,705 $ 1,484  
Ending balance $ 25,390 $ 25,890    
Ending balance (shares) (85,192,233) (81,493,082)    
Common stock dividend per share (USD per share) $ 4.16 $ 3.80 $ 3.64  
Convertible Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Preferred stock, shares outstanding       1,500,000
Common Stock Issued at Par Value        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Convertible preferred stock, shares issued upon conversion       5,955,000
Common Stock Issued at Par Value        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 371 $ 371 $ 365  
Stock issued during period, conversion of convertible securities     6  
Ending balance 371 371 371  
Capital in Excess of Par Value        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 19,893 19,720 19,553  
Stock issued during period, conversion of convertible securities     (4)  
Issuance of shares under employee and other plans, net (76) (73) (88)  
Share-based compensation 258 247 259  
Ending balance 20,075 19,893 19,720  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 16,139 15,535 15,157  
Net Income 1,678 1,705 1,484  
Dividends, common stock (1,196) (1,100) (1,046)  
Dividends, preferred stock     (60)  
Ending balance 16,622 16,139 15,535  
Deferred Compensation        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 25 24 23  
Issuance of shares under employee and other plans, net   1 1  
Ending balance 25 25 24  
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ (8,807) $ (8,305) $ (8,330)  
Beginning balance (shares) (81,493,000) (80,203,000) (81,283,000)  
Issuance of shares under employee and other plans, net $ 5 $ 2 $ 24  
Share-based compensation plans, net (shares) 820,000 801,000 1,056,000  
Common stock held in trusts, net (shares) 14,000 27,000 24,000  
Treasury stock, value, acquired, cost method $ (1,006) $ (503)    
Treasury stock, shares, acquired (4,533,000) (2,118,000)    
Ending balance $ (9,808) $ (8,807) $ (8,305)  
Ending balance (shares) (85,192,000) (81,493,000) (80,203,000)