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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, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Nov. 30, 2021
Sep. 24, 2013
Beginning balance   $ 23,677     $ 23,677      
Net income $ 454   $ 299   1,131 $ 1,302    
Ending balance $ 24,525       $ 24,525      
Dividends per Common Share (USD per share) $ 0.87 $ 0.87 $ 0.83 $ 0.83 $ 1.74 $ 1.66    
Number of shares authorized to be repurchased (in shares)               10,000
Number of additional shares authorized to be repurchased (in shares)             10,000  
Common Stock  Issued at Par Value                
Beginning balance $ 365 $ 365 $ 365 $ 365 $ 365 $ 365    
Ending balance 365 365 365 365 365 365    
Capital in Excess of Par Value                
Beginning balance 19,435 19,272 19,301 19,270 19,272 19,270    
Common stock issued for share-based compensation and other plans, net (21) (71) (15) (53)        
Share-based compensation 56 83 55 83        
Repurchase of common stock   (150)            
Common stock held in trusts, net (24)              
Ending balance 19,495 19,435 19,341 19,301 19,495 19,341    
Retained Earnings                
Beginning balance 14,233 13,826 13,522 12,791 13,826 12,791    
Net income 454 677 299 1,003        
Common dividends (248) (248) (242) (242)        
Preferred dividends (23) (23) (23) (23)        
Ending balance 14,416 14,233 13,557 13,522 14,416 13,557    
Retained Earnings | Effect of change in accounting principles                
Effect of change in accounting principles       (9)        
Deferred Compensation                
Beginning balance 24 23 23 23 23 23    
Common stock issued for share-based compensation and other plans, net 1              
Ending balance 24 24 23 23 24 23    
Treasury Stock                
Beginning balance $ (7,855) $ (7,723) $ (6,136) $ (6,138) $ (7,723) $ (6,138)    
Beginning balance (shares) (79,869) (80,164) (74,080) (74,623) (80,164) (74,623)    
Common stock issued for share-based compensation and other plans, net $ 14 $ 19 $ 4 $ 2        
Common stock issued for share-based compensation and other plans, net (in shares) 284 762 234 549        
Common stock held in trusts, net (in shares) 9 (5) 23 (7)        
Repurchase of common stock   $ 150            
Repurchase of common stock (in shares)   462            
Common stock held in trusts, net $ (24)              
Ending balance $ (7,866) $ (7,855) $ (6,132) $ (6,136) $ (7,866) $ (6,132)    
Ending balance (shares) (79,575) (79,869) (73,821) (74,080) (79,575) (73,821)