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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Jun. 01, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 25,796      
Beginning balance (shares) (80,202,608)      
Net Income $ 1,705 $ 1,484 $ 1,779  
Stockholders' equity note, spinoff transaction     $ 251  
Ending balance $ 25,890 $ 25,796    
Ending balance (shares) (81,493,082) (80,202,608)    
Common stock dividend per share (USD per share) $ 3.80 $ 3.64 $ 3.48  
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 $ 365 $ 365  
Stock issued during period, conversion of convertible securities   6    
Ending balance 371 371 365  
Capital in Excess of Par Value        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 19,720 19,553 19,272  
Stock issued during period, conversion of convertible securities   (4)    
Issuance of shares under employee and other plans, net (73) (88) (108)  
Share-based compensation 247 259 239  
Treasury stock, value, acquired, cost method     150  
Ending balance 19,893 19,720 19,553  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 15,535 15,157 13,826  
Net Income 1,705 1,484 1,779  
Dividends, common stock (1,100) (1,046) (992)  
Dividends, preferred stock   (60) (90)  
Issuance of shares under employee and other plans, net     (1)  
Stockholders' equity note, spinoff transaction     634  
Ending balance 16,139 15,535 15,157  
Deferred Compensation        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 24 23 23  
Issuance of shares under employee and other plans, net 1 1    
Ending balance 25 24 23  
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ (8,305) $ (8,330) $ (7,723)  
Beginning balance (shares) (80,203,000) (81,283,000) (80,164,000)  
Issuance of shares under employee and other plans, net $ 2 $ 24 $ 44  
Share-based compensation plans, net (shares) 801,000 1,056,000 1,271,000  
Common stock held in trusts, net (shares) 27,000 24,000 25,000  
Treasury stock, value, acquired, cost method $ (503)   $ (650)  
Treasury stock, shares, acquired (2,118,000)   (2,415,000)  
Ending balance $ (8,807) $ (8,305) $ (8,330)  
Ending balance (shares) (81,493,000) (80,203,000) (81,283,000)