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Condensed Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common shares
Treasury shares
Paid-in-surplus
Retained earnings
AOCI
 [1]
Beginning balance (in shares) at Dec. 31, 2023   1,112,900,000        
Beginning balance (in shares) at Dec. 31, 2023     (503,200,000)      
Beginning balance at Dec. 31, 2023 $ 14,788 $ 2,782 $ (54,666) $ 5,193 $ 62,093 $ (614)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,985       4,985  
Other comprehensive income/(loss) (78) [2]         (78)
Conversion, stock option exercises, forfeitures, ESPP, and other (in shares) [3]   100,000 600,000      
Conversion, stock option exercises, forfeitures, ESPP, and other [3] $ 139 $ 1 $ 34 104    
Share repurchase programs (Note 16) (in shares) (3,498,381)   (3,500,000)      
Share repurchase programs (Note 16) $ (849)   $ (849)      
Dividends declared (2,401)       (2,401)  
Ending balance (in shares) at Sep. 30, 2024   1,113,000,000        
Ending balance (in shares) at Sep. 30, 2024     (506,100,000)      
Ending balance at Sep. 30, 2024 16,584 $ 2,783 $ (55,481) 5,297 64,677 (692)
Beginning balance (in shares) at Jun. 30, 2024   1,113,000,000        
Beginning balance (in shares) at Jun. 30, 2024     (503,300,000)      
Beginning balance at Jun. 30, 2024 16,489 $ 2,783 $ (54,757) 5,249 63,820 (606)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 1,671       1,671  
Other comprehensive income/(loss) (86) [4]         (86)
Conversion, stock option exercises, forfeitures, ESPP, and other (in shares) [3]     200,000      
Conversion, stock option exercises, forfeitures, ESPP, and other [3] $ 62   $ 14 48    
Share repurchase programs (Note 16) (in shares) (3,006,061)   (3,000,000.0)      
Share repurchase programs (Note 16) $ (738)   $ (738)      
Dividends declared (814)       (814)  
Ending balance (in shares) at Sep. 30, 2024   1,113,000,000        
Ending balance (in shares) at Sep. 30, 2024     (506,100,000)      
Ending balance at Sep. 30, 2024 $ 16,584 $ 2,783 $ (55,481) 5,297 64,677 (692)
Beginning balance (in shares) at Dec. 31, 2024 604,241,260 1,113,000,000        
Beginning balance (in shares) at Dec. 31, 2024     (508,800,000)      
Beginning balance at Dec. 31, 2024 $ 16,890 $ 2,783 $ (56,132) 5,334 65,628 (723)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 5,290       5,290  
Other comprehensive income/(loss) 51 [2]         51
Conversion, stock option exercises, forfeitures, ESPP, and other (in shares) [3]   200,000 700,000      
Conversion, stock option exercises, forfeitures, ESPP, and other [3] $ 184   $ 53 131    
Share repurchase programs (Note 16) (in shares) (11,857,159)   (11,900,000)      
Share repurchase programs (Note 16) $ (2,694)   $ (2,777) 83    
Dividends declared $ (2,417)       (2,417)  
Ending balance (in shares) at Sep. 30, 2025 593,127,096 1,113,200,000        
Ending balance (in shares) at Sep. 30, 2025     (520,000,000.0)      
Ending balance at Sep. 30, 2025 $ 17,304 $ 2,783 $ (58,856) 5,548 68,501 (672)
Beginning balance (in shares) at Jun. 30, 2025   1,113,200,000        
Beginning balance (in shares) at Jun. 30, 2025     (520,200,000)      
Beginning balance at Jun. 30, 2025 16,258 $ 2,783 $ (58,870) 5,505 67,532 (692)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 1,788       1,788  
Other comprehensive income/(loss) 20 [4]         20
Conversion, stock option exercises, forfeitures, ESPP, and other (in shares) [3]     200,000      
Conversion, stock option exercises, forfeitures, ESPP, and other [3] $ 57   $ 14 43    
Share repurchase programs (Note 16) (in shares) 0          
Share repurchase programs (Note 16) $ 0          
Dividends declared $ (819)       (819)  
Ending balance (in shares) at Sep. 30, 2025 593,127,096 1,113,200,000        
Ending balance (in shares) at Sep. 30, 2025     (520,000,000.0)      
Ending balance at Sep. 30, 2025 $ 17,304 $ 2,783 $ (58,856) $ 5,548 $ 68,501 $ (672)
[1] AOCI = accumulated other comprehensive income/loss (Note 9)
[2] Net of deferred taxes of ($1.8) million and $0.7 million during the nine months ended September 30, 2025 and 2024, respectively.
[3] ESPP = employee stock purchase plan
[4] Net of deferred taxes of $0.1 million and $0.8 million during the three months ended September 30, 2025 and 2024, respectively.