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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 9 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance     $ 25,890       $ 25,890  
Net income $ 574     $ 487     1,185 $ 1,305
Ending balance $ 25,472           $ 25,472  
Dividends per Common Share (USD per share) $ 1.04 $ 1.04 $ 1.04 $ 0.95 $ 0.95 $ 0.95 $ 3.12 $ 2.85
Common Stock Issued at Par Value                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ 371 $ 371 $ 371 $ 371 $ 371 $ 371 $ 371 $ 371
Ending balance 371 371 371 371 371 371 371 371
Capital in Excess of Par Value                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance 19,971 19,768 19,893 19,795 19,741 19,720 19,893 19,720
Issuance of shares under employee and other plans, net (2) (6) (65) (2) (5) (62)    
Share-based compensation 55 59 90 54 60 83    
Repurchase of common stock   150 (150)          
Ending balance 20,024 19,971 19,768 19,847 19,795 19,741 20,024 19,847
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance 16,150 16,141 16,139 15,802 15,540 15,535 16,139 15,535
Net income 574 308 303 487 537 281    
Common dividends (299) (298) (302) (275) (275) (275)    
Ending balance 16,426 16,150 16,141 16,015 15,802 15,540 16,426 16,015
Deferred Compensation                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance 26 25 25 26 24 24 25 24
Issuance of shares under employee and other plans, net (1) 1   (4) 2      
Ending balance 26 26 25 22 26 24 26 22
Treasury Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ (9,561) $ (9,425) $ (8,807) $ (8,811) $ (8,828) $ (8,305) $ (8,807) $ (8,305)
Beginning balance (shares) (83,987) (83,459) (81,493) (81,588) (81,692) (80,203) (81,493) (80,203)
Issuance of shares under employee and other plans, net   $ 13 $ (12) $ 4 $ 17 $ (20)    
Issuance of shares under employee and other plans, net (in shares) 18 78 679 26 72 647    
Common stock held in trusts, net (in shares) 2 13 (8) 10 32 (19)    
Repurchase of common stock (in shares)   (619) (2,637)     (2,118)    
Repurchase of common stock   $ (150) $ (606)     $ (503)    
Ending balance $ (9,561) $ (9,561) $ (9,425) $ (8,807) $ (8,811) $ (8,828) $ (9,561) $ (8,807)
Ending balance (shares) (83,967) (83,987) (83,459) (81,552) (81,588) (81,692) (83,967) (81,552)