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Shareholders' Equity - Changes in Certain Components of Shareholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance   $ 25,890     $ 25,890  
Net income $ 308   $ 537   611 $ 818
Ending balance $ 25,241       $ 25,241  
Dividends per Common Share (USD per share) $ 1.04 $ 1.04 $ 0.95 $ 0.95 $ 2.08 $ 1.90
Common Stock Issued at Par Value            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 371 $ 371 $ 371 $ 371 $ 371 $ 371
Ending balance 371 371 371 371 371 371
Capital in Excess of Par Value            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 19,768 19,893 19,741 19,720 19,893 19,720
Issuance of shares under employee and other plans, net (6) (65) (5) (62)    
Share-based compensation 59 90 60 83    
Repurchase of common stock 150 (150)        
Ending balance 19,971 19,768 19,795 19,741 19,971 19,795
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 16,141 16,139 15,540 15,535 16,139 15,535
Net income 308 303 537 281    
Common dividends (298) (302) (275) (275)    
Ending balance 16,150 16,141 15,802 15,540 16,150 15,802
Deferred Compensation            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 25 25 24 24 25 24
Issuance of shares under employee and other plans, net 1   2      
Ending balance 26 25 26 24 26 26
Treasury Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ (9,425) $ (8,807) $ (8,828) $ (8,305) $ (8,807) $ (8,305)
Beginning balance (shares) (83,459) (81,493) (81,692) (80,203) (81,493) (80,203)
Issuance of shares under employee and other plans, net $ 13 $ (12) $ 17 $ (20)    
Issuance of shares under employee and other plans, net (in shares) 78 679 72 647    
Common stock held in trusts, net (in shares) 13 (8) 32 (19)    
Repurchase of common stock (in shares) (619) (2,637)   (2,118)    
Repurchase of common stock $ (150) $ (606)   $ (503)    
Ending balance $ (9,561) $ (9,425) $ (8,811) $ (8,828) $ (9,561) $ (8,811)
Ending balance (shares) (83,987) (83,459) (81,588) (81,692) (83,987) (81,588)